EP2754948B1 - Lichtmodul für einen Kraftfahrzeugscheinwerfer, der zur Erzeugung streifenförmiger Lichtverteilungen eingerichtet ist - Google Patents

Lichtmodul für einen Kraftfahrzeugscheinwerfer, der zur Erzeugung streifenförmiger Lichtverteilungen eingerichtet ist Download PDF

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Publication number
EP2754948B1
EP2754948B1 EP13198356.1A EP13198356A EP2754948B1 EP 2754948 B1 EP2754948 B1 EP 2754948B1 EP 13198356 A EP13198356 A EP 13198356A EP 2754948 B1 EP2754948 B1 EP 2754948B1
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EP
European Patent Office
Prior art keywords
branch
light
branches
exit surface
light exit
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EP13198356.1A
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German (de)
English (en)
French (fr)
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EP2754948A3 (de
EP2754948A2 (de
Inventor
Emil P. Stefanov
Christian Buchberger
Henning Vogt
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Marelli Automotive Lighting Reutlingen Germany GmbH
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Automotive Lighting Reutlingen GmbH
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Publication of EP2754948A3 publication Critical patent/EP2754948A3/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources

Definitions

  • the invention relates to a light module for a motor vehicle headlight according to the preamble of claim 1.
  • Such a light module is from the DE 10 2009 053 581 B3 known and has an optical fiber assembly with at least a first optical fiber branch and a second optical fiber branch.
  • Each of the two branches has a light entry surface and a light exit surface, wherein the light exit surface is bounded in each case by two narrow sides and two longitudinal sides.
  • the two branches are arranged so that a narrow side of the first branch is arranged parallel and immediately adjacent to a narrow side of the light exit surface of the second branch.
  • the narrow sides of the light exit surfaces of the two branches are the same length, while the long sides the light exit surface of the second branch are longer than the longitudinal sides of the light exit surface of the second branch.
  • Each branch has two transport surfaces which define an optical fiber volume extending between the light entry surface and the light exit surface of each branch, at which light propagating in the optical fiber experiences internal total reflections and which are delimited by the longitudinal sides of the light exit surface of the branch.
  • the branches are components of a primary optic.
  • Each light entry surface has an LED whose light is coupled into the branch and coupled out via the light exit surface.
  • the light exit surfaces are arranged in a matrix, so that the sum of the light exit surfaces forms a pixel-like composite luminous surface whose shape can be varied by switching on and off of LEDs.
  • the luminous surface lies in the interior of the headlamp as an internal light distribution at a distance of a focal length of a secondary optics in front of the same and is projected by this as an external light distribution in the apron of the headlamp.
  • the known light module is also referred to below as the matrix light module.
  • the external light distribution on the roadway thus results as an image of the pixel-like internal light distribution inside the headlight which arises on the light exit surface of the primary optics.
  • the images of the pixels in the outer light distribution appear either light or dark.
  • the Switching off or dimming individual LEDs or groups of LEDs thus allows, for example, a targeted reduction in the lighting in areas in which the oncoming traffic could be dazzled.
  • each strip is generated by an optical fiber branch and a light source.
  • each light guide branch here replaces a column of light guide branches of the matrix.
  • the desired horizontal angular resolution of such a light module which generates strip-shaped light distributions is e.g. between 1.0 ° and 1.5 ° in the horizontal, this direction refers to the intended use of the headlight in a motor vehicle.
  • This limitation arises in connection with the light sources available in practice for use in motor vehicle headlights, which have fixed dimensions in terms of their geometry and also emit only a limited luminous flux. This requirement already limits the variability of the optical system.
  • the preferred high-power LEDs for this use have a luminous and thus active light-emitting surface with a square shape and a size of approx. 0.5 mm 2 .
  • the active area is constant regardless of the emitted luminous flux.
  • Equally constant is the LED emission characteristic, ie the angular distribution of the radiated light. As a rule, it is a so-called Lambert characteristic.
  • the so-called warm luminous flux in LED continuous operation is at a maximum allowable electrical operating current, for example, about 80 lumens. It is to be expected that the heat flux will increase to a limited extent in the future. However, with respect to the present invention, the available luminous flux is considered to be limited.
  • the number of light sources of a light module should be as low as possible.
  • Light modules which generate strip-shaped light distributions are therefore preferred over light modules which generate matrix-like light distributions.
  • high light transmission efficiency is also required.
  • the luminous transmission efficiency is understood to mean, for example, the luminous flux emerging from a secondary optic after its normalization to the luminous flux entering the primary optics.
  • an object of the present invention is to provide a light module of the type mentioned, which is a generation of vertically striped strip light distributions with a small number allowed by light sources.
  • the strip-shaped light distribution should have a first narrow side, at which a pronounced maximum of the brightness is. Starting from this and tapering towards the opposite second narrow side of the strip-shaped light distribution, the brightness should decrease.
  • the gradient of the illuminance or brightness should be much steeper on the side of the maximum facing the first narrow side of the light distribution than on the side of the maximum facing the second narrow side.
  • the result is an illuminated strip with a sharp cut-off on the first narrow side, an adjoining region of maximum brightness and on the other side of the maximum soft and continuous expiring brightness, so with increasing distance from the sharp light - Set the dark limit and the brightness maximum continuously over the strip length decreasing brightness.
  • the brightness should decrease disproportionately to increasing distance with increasing distance from the maximum and increase correspondingly in the reverse direction from the second narrow side in the direction of the maximum out of proportion to the distance from the second narrow side.
  • the present invention differs from the known matrix light module in that the said transport surfaces of each branch have surface normals having a directional component facing more to a first of the two narrow sides of the branch than to a second of the two narrow sides of the branch. This applies to a plurality of all points of the transport surfaces, to which incident on the associated light entry surface incident light. It is also essential that the immediately adjacent and mutually parallel narrow sides are a second narrow side of the first branch and a first narrow side of the second branch.
  • a ray incident at a point, the perpendicular of the reflection surface at this point, or the surface normal at that point, and the reflected ray emanating from this point always lie in one and the same plane. This means that for a given angle of incidence one can control the direction of the reflected beam by the inclination of the reflecting surface and thus by the orientation of the surface normal.
  • the surface normals of those two transport surfaces of each branch which are delimited by the longitudinal sides of the light exit surface of the branch, have a directional component which has more to a first of the two narrow sides of the branch than to a second of the two narrow sides of the branch, the light in the reflection preferably deflected in the direction of the first narrow side.
  • a narrow side of the first branch is arranged parallel and immediately adjacent to a narrow side of the light exit surface of the second branch, and the images of the light exit surfaces in the arranged according to the outer light distribution adjacent to each other.
  • the immediately adjacent and parallel narrow sides are a second narrow side of the first branch and a first narrow side of the second branch
  • the adjoining regions preferably have the same brightness where they adjoin one another.
  • a brightness maximum of one surface thus meets a brightness minimum of the other surface, the maximum of one surface having the same value as the minimum of the other surface.
  • the light exit surface of the second branch is greater than the light exit surface of the first branch. Accordingly, the light flux coupled into the first branch is distributed to a smaller light exit surface than the luminous flux coupled into the second branch. If the same light sources are used in each case, a larger maximum brightness can be generated with the smaller light exit surface of the first branch than with the larger light exit surface of the second branch.
  • the arrangement with the two light guide branches thus provides a strip-shaped light distribution, in the longitudinal direction of the strip from the first narrow side of the light exit surface of the first Branch and the second narrow side of the light exit surface of the second branch is limited.
  • the brightness decreases starting from a pronounced maximum, which lies on the first narrow side and tapering towards the opposite second narrow side.
  • the gradient of the illuminance is much steeper on the side of the maximum facing the first narrow side than on the side of the maximum facing the second narrow side.
  • the result is an illuminated strip with a sharp light-dark boundary on the first narrow side and a smooth and continuous outgoing brightness on the other side of the maximum.
  • the brightness decreases with increasing distance from the maximum disproportionate to the increase in distance. Accordingly, it increases in the opposite direction from the second narrow side, starting in the direction of the maximum overproportional to the distance from the second narrow side.
  • the present invention allows for juxtaposition of such light conductor arrangements with a first light guide branch and a second light guide branch in a light module, the generation of a composite of individual stripes light distribution, a pronounced intensity maximum on a narrow side of the strip and a continuous outlet of the intensity, ie a continuous decrease the brightness of the strip toward the other narrow side has.
  • the invention allows the generation of strip-shaped light distributions under the boundary conditions mentioned above with a pronounced cut-off with a brightness maximum of more than 120 lux and a brightness outlet extending up to a vertical angular width of up to 6 °.
  • a further advantage of the vertically elongated light exit surface is that the secondary optics following in the direction of propagation of the primary optic light can be smaller in this vertical direction than would be the case without the vertical extension of the primary optic light exit surface. This follows from the Etandue conservation law. In the given concrete realization, the vertical height of a secondary optic could be reduced to 40 mm as a consequence of the vertical light bundling improved by the primary optics. On the other hand, values of 60 to 80 mm are more common without the invention.
  • the light distribution forming optical head with the optical fiber branches optimized according to the present invention has a high light transmission efficiency.
  • values of 50% to more than 60% can be achieved for a system of primary optics and secondary optics, that is to say without a cover disc. This means that 50% to more than 60% of the light energy coupled into the primary optics also emerge again from secondary optics.
  • the value depends on the aspect ratios of the light exit surface (ratio of the lengths of the narrow sides to the lengths of the long sides) and the position of the light guide with respect to the optical axis secondary optics.
  • a low beam light function and a high beam light function are in a matrix light module according to the above-mentioned DE 10 2009 053 581 B3 a number of 80 to 120 LEDs each with 80 lumens of luminous flux required.
  • the present invention makes it possible to reduce this number to about 60 LEDs.
  • the bundling required for this concrete example succeeds only if the light guides are constructed according to the principle already presented and the narrow sides of the light exit surfaces of the branches have a horizontal width of approximately 1.9 mm to 2.1 mm. Since the angular resolution is predetermined, there is also a preferred focal length range for the secondary optics, which lies in this particular example between 90mm and 100mm.
  • the present invention provides a solution that has the potential to meet previously incompatible framework conditions and to meet new challenges.
  • FIG. 1 shows with the dashed curve a desired brightness profile 1 of a strip-shaped light distribution over the angle ⁇ V , as it adjusts in advance of the light module on a perpendicular to the main emission of the light module arranged screen.
  • This angle indicates at an intended use of the light module in a motor vehicle headlight in a motor vehicle at an angular deviation in the vertical direction of a vehicle longitudinal axis, which is located at the height of the horizon in front of the vehicle.
  • the desired light distribution according to profile 1 below the horizon has virtually no brightness, followed by a steep rise to a large maximum value which is just above the horizon, and a gradual drop to zero with increasing angle height above the horizon ,
  • the continuous drawn curve represents a brightness profile 2, as can be achieved with a single optical fiber branch, which will be described in more detail below and which is fed by a single light-emitting diode.
  • This profile 2 has a shape very similar to the desired profile 1, but remains below the values of the desired profile with its absolute values. This is because the luminous flux of the LED, which supplies light to a single branch, is too low.
  • the shape of the achievable profile also depends on the geometry and size of the light exit surface of the semiconductor light source used, which is arranged in a light module of a motor vehicle headlight directly in front of the light entry surface of the light guide branch. The achievable course is based on the use of a commercially available for headlights of motor vehicles semiconductor light source that provides a specific luminous flux.
  • the desired profile 1 would then result from the profile 2 without further changes of the arrangement if a light source of the same geometry but could be used correspondingly higher luminous flux. Such a light source is not available.
  • the light guide must be modified at least to such an extent that its light entry surface allows the light to be coupled in from two light sources.
  • the light entrance surface must be so in particular be greater than if they would allow only the coupling of light from a single light source. Then inevitably changes the geometry of the light guide, for example, the ratio of its (unchanged) light exit surface to now become larger light entrance surface.
  • An essential element of the invention consists in the described arrangement of at least two optical fiber branches, each of which is fed with its own semiconductor light source.
  • Each of the at least two light guide branches illuminates only a part of the vertical angular width of the desired light distribution.
  • the profile 1 corresponds to a strip, as it is generated in the context of the present invention with two branches per strip.
  • the maximum of the profile 1 is around about a quarter higher than the maximum of the profile produced with the same luminous flux 3.
  • the outlet of the profile 1 is also more pronounced.
  • FIG. 3 shows a light guide assembly 10 having at least a first optical fiber branch 12 and a second optical fiber branch 14.
  • the first branch 12 has a light entrance surface 12.1 and a light exit surface 12.2.
  • the light exit surface 12.2 is bounded by two narrow sides 12.3 and 12.4 and by two longitudinal sides 12.5 and 12.6.
  • the second branch 14 has a light entry surface 14.1 and a light exit surface 14.2.
  • the light exit surface 14.2 is bounded by two narrow sides 14.3 and 14.4 and by two longitudinal sides 14.5 and 14.6.
  • the two branches 12, 14 are arranged so that a narrow side 12.4 of the first branch 12 is arranged parallel and immediately adjacent to a narrow side 14.3 of the light exit surface 14.2 of the second branch 14.
  • the narrow sides of the two branches are the same length, while the longitudinal sides 14.5, 14.6 of the light exit surface of the second branch are longer than the longitudinal sides 12.5, 12.6 of the light exit surface of the second branch.
  • Each branch has two transport surfaces which delimit an optical fiber volume extending between the light entry surface and the light exit surface of each branch and which in turn are delimited by longitudinal sides of the light exit surfaces and internal light propagating in the optical fiber Total Reflections learns.
  • FIG. 3 shows a transport surface 12.7 of the first branch 12, which is bounded by the longitudinal side 12.6 of the light exit surface of the first branch. The limited by the other longitudinal side 12.5 further transport surface is in the FIG. 3 obscured by the optical fiber branch 12.
  • a transport surface is an interface of a light guide, where internal total reflections take place.
  • FIG. 3 further shows a transport surface 14.7 of the second branch 14, which is delimited by the longitudinal side 14.6 of the light exit surface of the second branch. The limited by the other longitudinal side 14.5 further transport surface is in the FIG. 3 obscured by the light guide branch 14.
  • transport surfaces differ from other transport surfaces of the respective light guide in that they are delimited by the longitudinal sides of the light exit surface of the branch, wherein in each case a transport surface is bounded by a longitudinal side.
  • Other transport surfaces of the two branches are each bounded by a narrow side of a respective branch.
  • exit optics surface 12a Downstream of the light exit surface 12.2 of the first branch is an exit optics surface 12a in the beam path. Similarly, downstream of the light exit surface 14.2 of the second branch 14 in the beam path is associated with an exit optical surface 14.a. These exit optic surfaces are each convexly arched convexly away from the branches 12, 14 in the manner of a pillow. As a result, the light emerging from the light exit surfaces of the branches 12, 14 is directed toward a secondary optics (cf. FIG. 9 ) bundled.
  • Sub-light beams which at their exit from the light exit surfaces of a branch have an undesirably large angle to Hauptabstrahlraum with which they would contribute, for example, to an undesirable bright lattice structure on the road, are preferably directed by the exit optics surfaces at the secondary optics. This also makes it possible to avoid unwanted, diffuse illumination of dark areas of the emitted light distribution.
  • An exit optic surface may be an interface, that is, it may be a light exit surface of a branch, or it may be a light exit surface of exit optics separate from the associated branch.
  • the branches and exit optics are made of transparent material such as glass or PMMA or PC.
  • the light guide branches 12, 14 are characterized in particular by the fact that the transport surfaces have surface normals with a directional component which point more to a first of the two narrow sides of the branch than to a second of the two narrow sides of the branch, this for a plurality of all points of the transport surfaces applies to which incident on the associated light entry surface incident light.
  • FIG. 4 a cross section of the assembly 10, wherein this cross section of a cross section through the first branch 12 and through the second Branch 14 composed.
  • the cross section of the first branch 12 is limited by the transport surfaces 12.7, 12.8, 12.9 and 12.10, which in the FIG. 2 appear as cut edges.
  • the transport surface 12.7 is limited by the longitudinal side 12.6 transport surface.
  • the transport surface 12.8 is limited by the longitudinal side 12.5 transport surface.
  • the transport surface 12.9 is limited by the narrow side 12.3 transport surface.
  • the transport surface 12.10 is limited by the narrow side 12.4 transport surface.
  • FIG. 2 shows a surface normal 12.7n of the transport surface 12.7 and a surface normal 12.9n of the transport surface 12.9.
  • the directional component 15 away from the transport surface 12.10 which is bounded by the narrow side 12.4.
  • the narrow side 12.4 thus represents a second narrow side in the sense of claim 1.
  • the cross section of the second branch 14 is limited by the transport surfaces 14.7, 14.8, 14.9 and 14.10, which in the FIG. 4 appear as cut edges.
  • the transport surface 14.7 is limited by the longitudinal side 14.6 transport surface.
  • the transport surface 14.8 is limited by the longitudinal side 14.5 transport surface.
  • the transport surface 14.9 is limited by the narrow side 14.3 transport surface.
  • the transport surface 14.10 is the limited by the narrow side 14.4 transport surface.
  • FIG. 2 shows a surface normal 14.7n of the transport surface 14.7 and a surface normal 14.8n of the transport surface 14.8.
  • the branches 12, 14 and their transport surfaces are designed so that the reference to the FIG. 4 shown relationships apply to a majority of all points of the transport surfaces, to which via the associated Light incident surface incoupled light is incident.
  • the immediately adjacent and parallel narrow sides 12.4 and 14.3 are a second narrow side 12.4 of the first branch 12 and a first narrow side 14.3 of the second branch 14.
  • That the surface normal 14.7 has a directional component 15, which has more to a first narrow side 14.9 of the two narrow sides of the branch 14 than to a second narrow side 14.10 of the narrow sides of the branch 14, at least for the majority, but preferably for all points of said lateral transport surfaces of the second branch 14 apply.
  • That the surface normals 12.7, 12.9 of the first branch also have such a directional component that points more to a first narrow side 12.9 of the two narrow sides of the branch 12 than to a second narrow side 12.10 of the narrow sides of the branch 12, should also in the case of the branch 12 at least for the plurality, but preferably apply to all points of the said lateral transport surfaces of the first branch 12.
  • An essential difference between the cross-sections through the first, upper branch 12 and the second, lower branch 14 is that the width difference of the narrow sides is greater in the case of the second branch 14 than in the case of the first branch 12. Another difference is that that the distance between the narrow sides of a branch is smaller in the case of the first branch 12 than in the case of the second branch 14. This is preferably true for all pairs of cross sections through the branches 12, 14, in which the cross sections of a pair have the same distance from their light entry surface and / or light exit surface.
  • both differences contribute to the fact that the surface normals of the second branch 14 are directed steeper to the wider narrow side 14. 9 of the second branch 14 than the surface normals of the first branch 12 are directed to the wider narrow side of the first branch 12.
  • the light propagating in the second branch 14 is concentrated comparatively more strongly in the vicinity of the broader narrow side of the second branch.
  • the light propagating in the first branch 12 is concentrated comparatively less strongly in the vicinity of the broader narrow side of the first branch 12.
  • the transport surfaces 12.7, 12.8, 14.7, 14.8 are limited in the illustrated embodiment by straight lines.
  • the boundary lines are curved in other embodiments, so that the shape of the transport surfaces is not limited to flat surfaces.
  • the surfaces can also be convex or concave. However, it is essential that the stated condition for the surface normals is observed.
  • upper and lower transport surfaces 12.9, 12.10, 14.9, 14.10 are preferably flat surfaces, which have a trapezoidal shape in the plan view, lies at the wider side on the light exit side of the respective branch. As a result, a concentration of the light is achieved on the stripe width.
  • the longitudinal sides may also be concave or convex, but the width of the surface should increase continuously as the distance from the light entrance surface and the distance from the light exit surface increases.
  • the second branch 14 alone produces a stripe-shaped light distribution in which the brightness between the narrow sides of the light distribution changes comparatively more than is the case with the first branch.
  • the first branch alone generates a strip-shaped light distribution in which the brightness between the narrow sides of the light distribution changes comparatively less than is the case in the second branch.
  • Another difference is that the length of the light strip produced by the second branch is greater than the length of the light strip produced by the first branch.
  • a brightness maximum results close to the first narrow side.
  • the brightness decreases to a value which preferably corresponds to the value which results on the light exit surface of the second branch close to its first narrow side 14.3.
  • the brightness decreases gradually and with increasing distance from the first narrow side 14.3 and increasing approach to the second narrow side of the light exit surface of the second branch, so that there is a soft brightness leakage.
  • FIG. 5 shows qualitatively vertical profiles of the brightness or light intensity I of the light distribution generated by the first branch, the light distribution generated by the second branch and the light distribution composed of these two light distributions over the angle ⁇ V .
  • FIG. 5a shows the light distribution generated by the first branch 12.
  • FIG. 5b shows the light distribution generated by the second branch 14 and
  • FIG. 5c shows the total light distribution resulting as the sum of the individual light distributions.
  • the first branch 12 produces a pronounced maximum (high I values) of the brightness over a comparatively narrow range of approximately 1.5 degrees width.
  • the zero-degree increase in brightness corresponds to a sharp cut-off. This is associated with the narrow side 12.3.
  • This sharp cut-off line also results in the cumulative light distribution according to FIG. 5c .
  • a likewise still sharp light-dark boundary also generates the first branch on a side associated with the second narrow side 12.4.
  • this light-dark boundary does not form, because the decrease in brightness of the light distribution generated by the first branch 12 there according to the brightness increase of the light distribution generated by the second branch 14 Figure 3c is compensated.
  • the light distribution generated by the second light guide 14 is in the FIG.
  • the specified angle values are not random values but result from the desired values of the strip width, the strip height and the luminous fluxes of the available LEDs.
  • the second light guide 14 thus produces an extended brightness leakage, ie a continuous decrease in brightness, which is not perceived as a sharp cut-off line, towards a narrow side of the light exit surface of the light guide 14.
  • the second light guide 14 generates on the other narrow side of its light exit surface a comparatively sharply limited brightness maximum.
  • the position of the bright strip above the horizon shown here is characteristic of a light module that generates a high beam component of a light distribution of a motor vehicle headlight. It is understood, however, that the invention is also suitable for the production of low-beam light distributions. This results from the ability to create a sharp cut-off on one side of the brightness maximum.
  • a low beam headlamp can be built according to the same principles.
  • the stripes do not have to go down but upwards. This arrangement results from the secondary optics projecting the assembly upside down and backwards into the apron (e.g., on a screen or lane).
  • a bi-functional headlamp which realizes both low beam and high beam function, can also be built according to the principles presented.
  • branches 12 and 14 are indeed, as FIG. 4 and the accompanying description is constructed according to the same principles. However, they also have differences that produce different effects: At least one of the branches, here the branch 12, is responsible for the maximum generation, and at least one other branch, here the branch 14, is responsible for the discontinuation generation.
  • each of the adjacent light exit surfaces is assigned its own main exit optic surface, which is arranged behind the light exit surface in the light path.
  • the main exit optic surface of the one light guide forms then in each case a secondary exit optics surface for the adjacent light guide.
  • Light emerging from an edge region of a main exit surface and entering due to its propagation direction in a secondary exit surface there is preferably deflected so that it does not come to the secondary optics and thus does not contribute to a disturbingly strong brightening of the transition region between the two individual light distributions.
  • the drive circuit is set up to jointly operate the light sources of a strip.
  • Another embodiment provides an individual control of these light sources, so that an additional variability of the light distribution to be generated is achieved.
  • the brightness maximum generating light source may be dimmed to highlight the edge illumination, or the edge illumination generating light source may be dimmed to further direct the driver's attention to the maximum brightly illuminated area. It is also possible to darken individual strips in order to avoid dazzling the oncoming traffic, which is located within the light cone just in the strip in question.
  • the invention allows profile scaling when doubling the LED light flux (for example, from 80Lm to 160Lm per pair of branches), at which all brightness values of the profile are also doubled.
  • FIG. 6 shows an embodiment of a primary optics 20 with a plurality of arrangements of pairs of branches in a perspective view, in particular, the light entry surfaces 22, 24 are visible.
  • the pairs When used as intended in a light module of a motor vehicle, the pairs are arranged in the horizontal direction H next to each other and the branches of a pair are arranged one above the other in the vertical direction V.
  • the upper row is formed by first branches 12.
  • the lower row is formed by second branches 14.
  • a first branch 12 and a second branch 14 together form an arrangement according to FIG. 3 which together produces a strip of light distribution.
  • the six adjacent pairs are arranged laterally (along the horizontal H) at such a distance from each other that the stripe-shaped light distributions generated by the pairs touch immediately adjacent to each other or just merge into one another.
  • the light exit surfaces of the individual branches and / or their associated primary optic surfaces are preferably arranged touching each other. This is achieved particularly preferably by an integral-material realization of the entire arrangement of here 6 pairs of two branches each. It is understood that the number of pairs may also be different from 6.
  • convex Exit optics with integrated into this arrangement. There are then no adjustment steps required to arrange the convex light exit surfaces in the correct position in front of the light exit surfaces of the branches and there are also no fastening means required to fix the positionally correct arrangement. This applies analogously to the branches themselves, which are fixed in an integral realization in the correct position arrangement zueiander in the one-piece arrangement.
  • the first branches 12 have a polygonal (eg 8-cornered) light entrance surface 22 which is slightly larger than the active, light-emitting LED surface and which is not rectangular.
  • the first branch 12 preferably has a cross-section, in which, if the reference numerals from the Fig. 4 an upper side 12.9 of a first branch 12 has approximately the same width as it also prevails at half the distance of the upper side 12.9 and the lower side 12.10 in the middle of the cross-sectional profile.
  • the lower side 12.10 is preferably somewhat narrower, so that the lower halves of the in the Fig. 4 constructed with the reference numerals 12.7 and 12.8 side surfaces an upside down roof profile (trapezoid) build. This is in the Fig. 4 shown in the form of dotted lines. This roof profile promotes the formation of concentration rather to the upper decoupling edge. Since the upside down rooftop in the first branches is not as pronounced as in the second branches 14, where this shape in the FIG. 6 is clearly visible, formed in the upper branches 12 is not a strong decaying Brightness outlet.
  • each of the branches 12 and 14 is larger than the light entrance surface 22 of the respective branch. This is an important prerequisite, so that the branch can exert a bundling effect on the coupled light flux.
  • this cross section pixels is projected onto the roadway.
  • the angle height of this projection is 0.9 ° to 1.5 °, preferably about 1 °, for a first branch 12 on a perpendicular measuring wall.
  • the light entry surfaces of the second branches 14 are polygonal.
  • the second branches may have the same number of sides as the first branches 12. It is essential, however, that the second branches extend in the vertical direction over a larger angular range than the first branches 12. This is true at least in the vicinity of the light exit surfaces of the branches, preferably but for the whole length of the branches.
  • the thus formed, upside down roof profile of the second branches 14 is therefore pointed down (Compare also FIG. 4 ). From the point of view of the LED, after coupling, a greater proportion of the coupled luminous flux strikes these inclined side surfaces, which in the FIG.
  • This luminous flux component is deflected to the wider narrow side of the branch.
  • the wider narrow side is preferably realized as a flat surface.
  • the maximum brightness is formed on the upper narrow coupling-out edge, that is to say on the broader narrow side of the light-emitting surface of the branch and an exponential curve of a similar outlet of the brightness in the direction of the narrower narrow side of the branch 14.
  • the vertical extent of the light exit surfaces of the second branches 14 is here significantly greater than the vertical extent of the light exit surfaces of the first branches 12.
  • the horizontal width of the light exit surfaces is preferably constant within a pair of branches. Even with the first branches 12, the horizontal width of the respective light exit surface is the horizontal width of the associated light entry surface of this branch. This leads to a much stronger bundling, especially in the vertical direction, than in the horizontal direction.
  • the angle height imaged by the secondary optics of a projection system is preferably 4 degrees to 6 °, particularly preferably 5 °, for the strips produced by a second branch 14.
  • optical fibers 12, 14, as proposed here in a particular arrangement allow scaling of the brightness profile as a function of luminous flux.
  • the brightness maximum at the upper edge of the second light guide 14 is adapted to the brightness value of the lower edge of the associated first branch 12.
  • the primary optics 26 can be generated for a strip headlight. This can do that in the FIGS. 7 and 8th have shown appearance.
  • primary optics is understood to be the entirety of the branches and their associated exit optics, regardless of whether these elements form a structural unit connected in one piece with an integral substance or are composed of individual elements.
  • FIG. 7 a front view of a primary optics 26 of a strip-beam module, so in particular a view of the light exit surface.
  • the primary optics 8 centrally arranged pairs of two vertically superimposed branches. This achieves a high maximum brightness and a softness in the vertical direction.
  • the vertical height of the further outward individual branches is smaller than the vertical height of the further inner individual branches.
  • FIG. 8 shows a rear view of such a primary optics 26 of a strip high-beam module, ie in particular a view of the light entry surfaces.
  • the connection of Fig. 7 and 8th shows in particular that each branch is associated with an associated exit optics.
  • FIG. 9 schematically shows a motor vehicle headlight 30th with a housing 32, which is covered by a transparent cover 34 and in which an embodiment of a light module according to the invention is arranged.
  • the light module is a projection module.
  • This has in particular a primary optics 28.
  • the primary optic here corresponds to the subject of FIGS. 7 and 8th ,
  • the light exit surfaces of the exit optics of this primary optics are at a distance of a focal length of a secondary optics 36 in the direction of the optical axis of the secondary optics in the light path in front of the secondary optics.
  • the secondary optics is preferably produced as a lens made of transparent material, in particular of glass or plastic, in particular PC or PMMA.
  • the secondary optics is produced as a double-layer achromat from both plastics.
  • the secondary optics form the internal light distribution, which adjusts itself to the entire light exit surface of the exit optics, as external light distribution into the apron of the headlamp.
  • the primary optics and the secondary optics are arranged relative to one another in such a way that the primary optics concentrate the light bundle exiting their exit optics onto the secondary optics so that as little light as possible passes the secondary optics.
  • the light emanates from LEDs, wherein preferably one LED is arranged in front of each light entry surface of one of the branches.
  • secondary optics secondary optics having achromatic properties are preferably used, on the lens surface of which scattering microstructures are regularly or irregularly distributed.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Planar Illumination Modules (AREA)
EP13198356.1A 2013-01-15 2013-12-19 Lichtmodul für einen Kraftfahrzeugscheinwerfer, der zur Erzeugung streifenförmiger Lichtverteilungen eingerichtet ist Active EP2754948B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013200442.7A DE102013200442B3 (de) 2013-01-15 2013-01-15 Lichtmodul für einen Kraftfahrzeugscheinwerfer, der zur Erzeugung streifenförmiger Lichtverteilungen eingerichtet ist

Publications (3)

Publication Number Publication Date
EP2754948A2 EP2754948A2 (de) 2014-07-16
EP2754948A3 EP2754948A3 (de) 2016-06-08
EP2754948B1 true EP2754948B1 (de) 2017-10-18

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US (1) US9046237B2 (zh)
EP (1) EP2754948B1 (zh)
JP (1) JP6294675B2 (zh)
CN (1) CN103925544B (zh)
DE (1) DE102013200442B3 (zh)

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Publication number Publication date
JP2014143200A (ja) 2014-08-07
JP6294675B2 (ja) 2018-03-14
CN103925544A (zh) 2014-07-16
DE102013200442B3 (de) 2014-02-13
CN103925544B (zh) 2018-06-15
US9046237B2 (en) 2015-06-02
US20140198513A1 (en) 2014-07-17
EP2754948A3 (de) 2016-06-08
EP2754948A2 (de) 2014-07-16

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