EP2607776A2 - Dispositif d'éclairage pour un véhicule automobile avec une structure de guide de lumière - Google Patents

Dispositif d'éclairage pour un véhicule automobile avec une structure de guide de lumière Download PDF

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Publication number
EP2607776A2
EP2607776A2 EP20120198113 EP12198113A EP2607776A2 EP 2607776 A2 EP2607776 A2 EP 2607776A2 EP 20120198113 EP20120198113 EP 20120198113 EP 12198113 A EP12198113 A EP 12198113A EP 2607776 A2 EP2607776 A2 EP 2607776A2
Authority
EP
European Patent Office
Prior art keywords
light
narrow side
partial surface
region
light guide
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Withdrawn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
EP20120198113
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German (de)
English (en)
Other versions
EP2607776A3 (fr
Inventor
Hubert Zwick
Hermann Kellermann
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.)
Marelli Germany GmbH
Original Assignee
Automotive Lighting Reutlingen 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 Automotive Lighting Reutlingen GmbH filed Critical Automotive Lighting Reutlingen GmbH
Publication of EP2607776A2 publication Critical patent/EP2607776A2/fr
Publication of EP2607776A3 publication Critical patent/EP2607776A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/243—Light guides characterised by the emission area emitting light from one or more of its extremities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/237—Light guides characterised by the shape of the light guide rod-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/239—Light guides characterised by the shape of the light guide plate-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/241—Light guides characterised by the shape of the light guide of complex shape

Definitions

  • the present invention relates to a lighting device for a motor vehicle according to the preamble of claim 1.
  • Such a lighting device is from the DE 10 2008 048 765 A1 , there in particular Fig. 5 and Fig. 6 , known.
  • the known illumination device has a light guide structure which has a plurality of coupling-in areas and a planar light guide area.
  • the latter has a first wide side and a second wide side.
  • the first page is bounded by a first edge and the second page is bounded by a second edge.
  • the second broad side is opposite to the first broad side equidistant.
  • Narrow sides lying between the first edge and the second edge connect the first wide side to the second wide side.
  • Second narrow sides are shaped as parabolic sections and thus set up from a first narrow side to direct light incident on the second narrow side of a light source onto a third narrow side which serves as a light exit surface.
  • LEDs light-emitting diodes
  • LEDs emitting laterally to their mounting surface are not as widely available on the market as standard LEDs which radiate parallel or antiparallel to the surface normal of their mounting surface.
  • standard LEDs there are only a few choices for laterally emitting LEDs.
  • they provide a lower luminous flux, which, when summed over several LEDs requires a certain luminous flux, requires more LEDs, which in turn leads to higher costs and a higher probability of failure.
  • the present invention differs in that the second narrow side has a first partial surface and a second partial surface, wherein the second partial surface is staggered relative to the first partial surface toward the interior of the planar optical fiber region.
  • the second narrow side has a homogenizing effect on a part of the light. These effects are achieved by the said subdivision of the second narrow side into a first subarea and a second subarea which is staggered in relation to the first parallelizing subarea toward the interior of the planar lightguide region.
  • the light incident on the second narrow side is subdivided into sub-beams, which permit an individual alignment of the light bundles.
  • Each sub-area generates its own light distribution, which in sum give a different light distribution than if the second sub-area were not present.
  • the invention further allows to direct the light hidden from the first light bundle into a second subarea of the light distribution generated by the first subarea, which without this measure would be comparatively darker than other subareas of the first light distribution.
  • the resulting light beam is coupled out via the third narrow side.
  • the third narrow side then appears to the viewer with the light source switched on homogeneously, ie as a narrow band of light shining with uniformly distributed brightness. Such appearance is desired.
  • a preferred embodiment is characterized in that the second narrow side is adapted to parallelize light incident on the second narrow side from the first narrow side and to direct it to the third narrow side, wherein the first partial surface is a parallelizing partial surface and wherein also the second partial surface is a parallelizing partial surface.
  • the light exit surface from the interior of the light guide structure is illuminated with parallel light.
  • a further preferred refinement is characterized in that the first narrow side forms a transition of a coupling region having a light entry surface and materially connected to the planar region to the planar region, which coupling region is adapted to parallelize light of a light source coupled via its light entry surface and the parallelized light on the second narrow side to direct that the first partial area (unless it is shaded by the second partial area) and the second partial area of the second narrow side is illuminated.
  • the illumination of the first partial area not shaded by the second partial area and of the second partial area avoids dark areas on the light exit area which could occur if only a part of the sum of the first partial area and the second partial area were illuminated. It is also preferred that exactly the first partial area, insofar as it is not shaded by the second partial area, and the second partial area of the second narrow side be illuminated.
  • the light coupled in via the coupling-in region is thus used completely for the illumination of the two partial surfaces mentioned.
  • all coupled light is ultimately directed to the light exit surface, thus optimizing the efficiency that can be defined as the ratio of coupled light to coupled light.
  • the width of the second partial area decreases with increasing distance from the first narrow side.
  • the second partial surface has a trapezoidal or triangular contour.
  • the second partial surface is arranged closer to the first narrow side than to the third narrow side.
  • the second narrow side is divided into more than two partial surfaces.
  • a further preferred embodiment is characterized in that a part of the surface located further in the interior has a smaller focal length than a part of the surface lying further outside.
  • the second narrow side has a parabolic shape. This means that the edges with which the second narrow side meets the first side and the second side are parabolas.
  • the second narrow side comprises a series of adjacent surface segments, wherein edges with which the surface segments abut the first broad side and the second broad side have a parabola as an envelope.
  • optical waveguide structure has a plurality of surface-connected optical waveguide regions and coupling regions, the coupling-in regions being curved so that their light entry surfaces lie in one plane.
  • the optical waveguide structure has an area which serves to produce a luminous light exit surface and which is a cohesive component of the optical waveguide structure and that in the optical path lies behind the parallelizing partial surfaces of the second narrow side.
  • the third narrow side is divided into stepwise offset partial surfaces.
  • a curvature of a light exit surface can be reproduced with discrete steps without triggering an undesirable occurrence of internal total reflections. Internal total reflections are known to occur when the angle of incidence of the light on the curved light exit surface due to their curvature exceeds the critical angle of total reflection.
  • step-like offset partial surfaces are arranged, as it were, offset stepwise in the direction of a surface normal of the broad sides.
  • a curvature can also be generated in a further spatial direction, so that the possibility arises of providing luminous light exit surfaces which appear three-dimensionally curved.
  • the wide sides are flat parallel surfaces.
  • a plate-shaped optical waveguide structure is provided which is suitable in particular for stacking.
  • An alternative embodiment is characterized in that the broad sides are surfaces which are curved in space. This is advantageous for achieving three-dimensionally curved light exit surfaces in space. Further advantages will become apparent from subclaims, the description and the accompanying figures.
  • FIG. 1 an illumination device 1 for a motor vehicle with a light guide structure 12.
  • the light guide structure 12 is arranged in a housing 2 of the illumination device.
  • the housing 2 has a light exit opening, which is covered by a transparent cover.
  • the light guide structure 12 has a coupling-in region 14 and at least one planar light guide region 16.
  • the planar light guide region 16 has a first broad side 18, which is bounded by a first edge 18.1.
  • the planar light guide region 16 has a second broad side which lies equidistantly opposite the first broad side and which is delimited by a second edge 20.1.
  • the second broad side is obscured by the volume of the planar light guide region 16.
  • Narrow sides lie between the first edge 18.1 and the second edge 20.1 and connect the first wide side 18 to the second wide side.
  • a first narrow side, of which in the Fig. 1 only one edge 22.1 is shown delimits the planar light guide region 16 against the coupling region 14.
  • a second narrow side 24 is configured to parallelize light incident on a second narrow side 24 from a first narrow side and to direct it to a third narrow side 26.
  • the third narrow Page 26 illustrates a light exit surface of the light guide structure 12.
  • the second narrow side 24 has a first parallelizing partial surface 28 and a second parallelizing partial surface 30.
  • the second parallelizing partial surface 30 is staggered relative to the first parallelizing partial surface 28 in the direction of the interior of the planar optical fiber region 16.
  • the first partial area is bounded by the first edge 18.1 and the second edge 20.1
  • the second partial area is delimited by the second edge 20.1, but not by the first edge 18.1.
  • the coupling region 14 has a first end facing away from the planar light guide region and a second end facing the planar light guide region.
  • a light source 32 is arranged at the first end such that the light emitted by it is coupled into the end of the coupling region 14 facing away from the planar light guide region 16.
  • the light source 32 is preferably a semiconductor light source, in particular a single light-emitting diode or laser diode, or a spatial combination of a plurality of such diodes.
  • light-emitting diodes are usually used, which have a quadrangular, planar light exit surface with an edge length of 0.3 mm to about 2mm. The arrangement is such that the distance between the light exit surface of the semiconductor light source and the light entry surface of the coupling region is less than 1 mm.
  • the lighting should be as efficient as possible, ie with the highest possible proportion of the coupled-in light.
  • the x direction becomes a direction of a depth of the sheet light guide section
  • the y direction a direction of a width of the sheet light guide section and the light exit surface and defines the z-direction as the thickness of the planar light guide region and the height of the light exit surface.
  • the luminous area in the embodiment shown in FIG Fig. 1 is shown, a rectangle of the height delta z and the width delta y.
  • the x - y plane is considered as a horizontal plane and the x - z plane as a vertical plane. It is understood, however, that this consideration refers only to the explanation of the illustrated embodiments and thus defined in some way an entrained coordinate system. This is not intended to limit the possible orientations of the illumination device in a vehicle or even the possible orientations of light guide structures 12 within a lighting device 1. As far as horizontal angles are concerned in the following, these should lie in the x - y plane, while vertical angles should lie in the x - z plane.
  • the indication of these directions in the various figures therefore establishes a relationship between the orientations of the objects represented in each case.
  • the light source 32 is located at the origin of the illustrated coordinate system.
  • a main propagation direction of the light runs in the planar light guide region 16 from the first narrow side 22, which serves as the light entry surface of the planar light guide region 16, to the third narrow side 26, which serves as light exit surface.
  • the first partial surface 28 and the second partial surface 30 are arranged such that the second partial surface 30 is arranged staggered in a stepwise manner relative to the first partial surface 28 in a cross-section lying transversely to the main propagation direction of the light in the planar light-guide region.
  • a thickness of the planar light guide region 16 measured in the z direction is reduced in a transition region 29 lying between the first partial region 28 and the second partial region 30 in relation to the distance d present outside this transition region.
  • the second partial surface 30 extends over the entire length of the second narrow side 24 lying between the first narrow side 22 and the third narrow side 26.
  • the first partial surface 28 adjoins the first narrow side 22 and extends from there over only one Part of the length of the second narrow side 24 between the first narrow side 22 and the third narrow side 26.
  • the length of the third narrow side 26 serving as the light exit surface is greater in the y-direction than its fourfold width in the z-direction, in particular greater than its sixfold width and particularly preferably greater than eightfold its width.
  • a light source be it a single semiconductor light source or a spatially combined array of multiple semiconductor light sources. If several spatially separate light sources are used, a light guide volume is assigned to each light source, such an arrangement being considered as a unit cell.
  • the depth of the planar light guide region is preferably a multiple, in particular at least four times its thickness, which justifies the designation as a planar light guide.
  • Modern automotive lighting devices provide signal light distribution and / or headlight distribution.
  • a signal light distribution is used to indicate the presence of a motor vehicle and / or the intentions of his driver to other road users.
  • Headlight light distributions should illuminate objects in the travel path of the motor vehicle and thus make them perceptible to the driver.
  • the generation of a light distribution is also called a light function.
  • a lighting device fulfills a plurality of light functions with the aid of one or more light modules, which are arranged in such a lighting device.
  • the invention presented here preferably fulfills signal light functions, in particular a daytime running light function, a flashing light function, a position light function, a taillight function or a brake light function.
  • signal light functions in particular a daytime running light function, a flashing light function, a position light function, a taillight function or a brake light function.
  • lighting devices 1 according to the invention in addition to a by the invention fulfilled light function fulfill other lighting functions, for which they may have other light modules. Therefore, embodiments of lighting devices according to the invention can be, in particular, separate front lights for flashing or daytime running light lighting functions, or they can be front lights or rear lights that fulfill a plurality of light functions.
  • optical waveguide structures 12 of lighting devices Details of elements and / or configurations of optical waveguide structures 12 of lighting devices according to the invention are explained below.
  • the optical waveguide structure is first based on a planar design, as they are also in the Fig. 1 is illustrated explained. Below also three-dimensionally curved configurations are presented.
  • an elementary cell of an optical waveguide structure 12 of an embodiment of a lighting device according to the invention is composed of the coupling region 14, the planar optical waveguide region 16 and optionally a further region which serves to produce a predetermined contour of the light exit surface and which will be discussed in more detail below.
  • the FIG. 2 shows in its part a) an oblique view and in its part b) a plan view of the coupling region 14.
  • the coupling region 14 has a first region 14.1 and a Transition area 14.2 on.
  • the cross-section of the coupling-in region 14 widens continuously, starting from the light entry surface until the beginning of the transitional section 14. 2. In this case, the widening in the xy plane may not be identical to widening in the z direction.
  • a parallelization is understood to mean a narrowing of the opening angle of the light cone, which, however, does not yet merge into bundling with a focusing effect, that is to say the light propagating in parallel at maximum bundle constriction has the result.
  • the light continues to move only between the surfaces perpendicular to the z-direction, except for special cases to be described below. It thus moves between the first surface 18 of the Fig. 1 , which is also referred to below as a lid, and the opposite surface of the lid, which is also referred to below as the bottom.
  • the coupling-in region 12 is just designed such that it generates a predetermined angular distribution in the vertical direction.
  • the coupling-in region 14 has a curved shape.
  • a bent Einkoppellichtleiter has only two flat surfaces.
  • the coupling-in section has a rectangular cross-section and that this cross-section grows between the coupling-in surface and the transitional region in the form of the first narrow side 22 of the planar section 16 of the optical waveguide structure with a quadratic dependence on the length of the coupling-in region.
  • the coupling-in area is set up in such a way that it parallelizes the light of the light source 32 so far that the parallelized light beam that passes from the coupling region 12 into the planar light guide region 16 illuminates the entire angle-changing surface of the planar light guide region 16.
  • the light beam should not illuminate more than this area in order to avoid otherwise occurring loss of efficiency. But it should illuminate not less than this area, otherwise dark areas on the serving as a light exit side third narrow side 26 may occur.
  • FIG. 3 shows the coupling region 12 and the planar light guide region 16 together with exemplarily selected rays of a light bundle 36, which illuminates exactly the second narrow side 24 of the planar Lichtleiterbreichs 16 serving as angle-changing surface of the planar Lichtleiterbreichs 16 in this sense.
  • the coupling-in region 12 is cohesively connected to the planar light-conducting region 16, so that the first narrow side 22 of the planar light-guide region coincides with the end surface 34 of the coupling-in region 12.
  • the optical waveguide structure preferably consists of a conventional optical waveguide material such as polycarbonate (PC) or polymethyl methacrylate (PMMA) or another crystal-clear material such as glass or silicone.
  • the Fig. 3 shows in particular an embodiment in which the first narrow side 22 of the planar light guide region 16 forms a transition of a coupling surface 14 having a light entry surface and cohesively connected to the planar light guide region 16 to the planar light guide region, which coupling region 14 is adapted to coupled via its light entrance surface Parallelize light of a light source 32 and direct the parallelized light on the second narrow side 24 of the planar light guide region that the angle-changing surface of the planar light guide region, ie in particular the first partial surface 28 and the second partial surface 30 of the second narrow side 24 of the planar light guide region 16 illuminated becomes.
  • the angle-changing side 24 opposite fourth narrow side 40 of the planar light guide region 26 has no optical function in the embodiments presented here. Analogous to this area is also the portion 35, between the coupling region 14 and the second narrow side 24 without optical function.
  • FIG. 4 shows in its part a) an oblique view and in its part b) a plan view of a planar light guide region 16, in which the angle-changing second narrow side 24 is not yet divided into a first and second partial surface.
  • the angle-changing surface is obtained in a preferred embodiment by extruding a lying in the x-y plane parabola in the z direction.
  • the Fig. 5 shows a plan view of a planar light guide region 16, the angle-changing surface 24 is not yet divided into a first and second partial surface, together with a resulting distribution of the brightness H of the third narrow side 26 exiting light across the width delta y of the third narrow side 26th
  • the distribution is shown very schematically.
  • the angle-changing surface here has a parabolic shape. It is essential that a fourth portion of the light exit surface 26 closer to the angle-changing side 24 is significantly brighter than the average of the other portions, while an eighth portion farther from the angle-changing side 24 appears significantly less bright than the average of the other portions. Overall, the brightness distribution thus has a pronounced and disturbing inhomogeneity.
  • FIG. 6 again shows a plan view of a planar light guide region 16. This differs from the planar light guide region of the Fig. 5 in that the second narrow side has a first parallelizing partial surface 28 and a second parallel partial surface 30, wherein the second parallelizing partial surface 30 is staggered relative to the first parallelizing partial surface 28 toward the interior of the planar optical fiber region 16.
  • both partial surfaces 28, 30 are parabolic, with the two parabolas having the same focal point and the same direction. It is also preferred that the parabola of the stepped inwardly offset partial surface 30 has a smaller focal length compared to the focal length of the outer partial surface 28.
  • a beam 42 whose vertical angle distribution corresponds to that at the end of the coupling-in area becomes a portion 42b on the second partial surface 30 is reflected, the remainder 42a is reflected on the first partial surface 28.
  • a splitting into two bundles 42a and 42b results, which leave the planar light guide region 16 at two different y-locations.
  • FIG. 7 shows a section through the subject of Fig. 6 along the line VII-VII.
  • the flat optical waveguide region 16 shown there has a thickness d in the z-direction.
  • the first partial surface 28 has a thickness or width a
  • the second partial surface 30 has a thickness or width b.
  • FIG. 8 Another consequence of the reduction of the layer thickness in the light path behind the classified second sub-area 42b is in FIG. 8 shown.
  • the overall result is a very effective method for homogeneously illuminating the exit surface over the entire width delta y.
  • Fig. 9 illustrates the effect of the division of the angle-changing surface on the two stepwise offset partial surfaces. How actually already that Fig. 6 shows, a sub-beam 42b of the light beam 42, which would be without a subdivision of the angle-changing surface 24 in the beam path of the sub-beam 42a, inwardly offset. This means that a luminous flux is shifted to the right against the y-direction. In comparison with the FIG. 5 this is reflected in the Fig. 9 in that the intensity distribution in the object of Fig. 9 is more homogeneous than at the subject of Fig. 5 , The excess luminous flux from the middle area in Fig. 5 has been moved into the too dimly lit right area.
  • the Fig. 10 shows a further embodiment of a light guide structure 12 of a lighting device according to the invention in an oblique view.
  • the Fig. 11 shows the subject of the Fig. 10 in a top view.
  • the optical waveguide structure 12 according to 10 and 11 has a contour generating region 44, which serves to generate a luminous light exit surface, preferably a cohesive component of the light guide structure 12, and which lies in the light path behind the parallelizing partial surfaces 28, 30 of the second narrow side 24.
  • the third narrow side 26 is divided in this embodiment in stepwise offset faces.
  • a curved light exit surface can be reproduced with discrete steps, without triggering an undesired occurrence of total internal reflections, as occurs on actually curved surfaces, when the angle of incidence of the light on the curved light exit surface exceeds the critical angle of total reflection due to its curvature.
  • the light exit surfaces of the individual stages are configured in a preferred embodiment as light in predetermined directions refractive surfaces, for example as cylindrical surfaces.
  • the Fig. 10 shows an embodiment in which the second partial surface 30 has a constant width in the z-direction over its entire length.
  • the Fig. 12 shows a preferred embodiment, in which the width of the second partial area decreases with increasing distance from the first narrow side.
  • the second partial surface has a trapezoidal or triangular contour.
  • the second partial surface is arranged closer to the first narrow side than to the third narrow side, or, which is the same, that the second partial surface 30 is arranged closer to the coupling region 14 than to the light exit surface 26.
  • FIG. 14 shows how a plurality of, here five, preferably cohesively coherent light guide structures 12.1, 12.2, 12.3, 12.4, 12.5, a headlamp light function can be realized.
  • the areas for coupling light and parallelizing the light are each identical in this example, only the contour generating areas vary in length (parallel to x).
  • the contour is formed by steps whose steps are parallel and perpendicular to x.
  • the steps of the steps lying perpendicular to the x-direction are curved, in this case convex, in order to break the light incident parallel to the x-direction from the light guide interior into a desired light distribution.
  • the in the FIG. 13 arrangement shown still has the disadvantage that the light sources can not be arranged on a flat board.
  • Level boards are above all cheaper than flexible boards, so that a use of planar and rigid boards is advantageous.
  • FIG. 14 1 shows an embodiment in which the example of the first coupling-in region 14.1 shows how the connection to a planar printed circuit board or to a standard LED mounted on a planar printed circuit board can be realized as a light source 32 by means of a corresponding curvature thereof.
  • a standard LED is characterized in that its light-emitting surface is opposite to its mounting surface, with which it is fastened to a circuit board 46.
  • this curvature of the coupling-in region 14.1 can also be extended to the planar light guide region 16 and / or the contour generating region 44. Up to this point, it has merely been shown how a plane luminous curve can be generated with the aid of the contour generation area 44.
  • FIG. 15 shows a first way to get from a flat curve to a three-dimensional curved luminous curve.
  • the contour generating area 46 is divided into individual bars, which are subsequently curved in such a way that the light exit area 26 also follows the desired curve in the z direction.
  • the restriction of the curvature to the contour generating area 46 was made in the Fig. 15 just for the sake of simplicity.
  • those regions of the planar light guide region 16 in which exclusively already parallelized light propagates can also be deformed in this way.
  • FIG. 16 A second way to produce a three-dimensionally curved luminous curve is in the three views of a three-dimensionally curved contour generating area 46 of FIG FIG. 16 shown.
  • Fig. 16 a) shows an oblique view
  • Fig. 16b shows a view from the direction of the coupling region
  • Fig. 16c shows a plan view of such contour generating area.
  • contour generating area 46 instead of dividing the area into bars, as in the subject matter of FIGS FIG. 15 is the case, and then bend the bars in the design of the light guide structure according to the contour to be achieved, is the subject of the Fig. 16 the entire surface of the contour generating portion 46 is curved.
  • FIG. 17 shows a possibility of stacking a plurality of optical waveguide structures 12 in order to obtain complex light exit surfaces of individual optical waveguide structures 12 serving as elementary cells.
  • the individual optical waveguide structures 12 are at an angle in the space, which can be achieved, for example, by tilting the left upper end of the in FIG. 18
  • the tilted light exit surface scattering elements for example, cylinder
  • FIG. 18 shows a possibility that allows a further improvement of the uniformly bright appearance of the luminous and optionally three-dimensionally curved light exit surface.
  • the angle-changing second narrow side is not realized as a real parabola, but such a parabola is approximated by straight line sections or by plane surface segments.
  • FIG. 18 a) shows once again an embodiment of a planar light guide region 16, which is limited by a real parabola 52.
  • One from the Bundle 48 entering bundle region 48 is parallelized on the parabola and illuminates exactly one refractive exit element 50
  • FIG. 18 b) the same bundle 48 strikes a flat area segment 54 drawn for illustrative purposes with thick line width.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP12198113.8A 2011-12-22 2012-12-19 Dispositif d'éclairage pour un véhicule automobile avec une structure de guide de lumière Withdrawn EP2607776A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110089575 DE102011089575B3 (de) 2011-12-22 2011-12-22 Beleuchtungseinrichtung für ein Kraftfahrzeug mit einem gestuften Lichtleiter

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EP2607776A2 true EP2607776A2 (fr) 2013-06-26
EP2607776A3 EP2607776A3 (fr) 2015-06-17

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EP12198113.8A Withdrawn EP2607776A3 (fr) 2011-12-22 2012-12-19 Dispositif d'éclairage pour un véhicule automobile avec une structure de guide de lumière

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EP (1) EP2607776A3 (fr)
DE (1) DE102011089575B3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
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