EP3719391B1 - Module de feu de route partiel pour un phare de véhicule automobile - Google Patents

Module de feu de route partiel pour un phare de véhicule automobile Download PDF

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Publication number
EP3719391B1
EP3719391B1 EP20165557.8A EP20165557A EP3719391B1 EP 3719391 B1 EP3719391 B1 EP 3719391B1 EP 20165557 A EP20165557 A EP 20165557A EP 3719391 B1 EP3719391 B1 EP 3719391B1
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EP
European Patent Office
Prior art keywords
light
high beam
light source
beam module
partial high
Prior art date
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Active
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EP20165557.8A
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German (de)
English (en)
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EP3719391A1 (fr
Inventor
Wolfgang Dr. Hoßfeld
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Marelli Automotive Lighting Reutlingen Germany GmbH
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Marelli Automotive Lighting Reutlingen Germany GmbH
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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
    • 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
    • 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
    • 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
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
    • F21W2102/16—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions having blurred cut-off lines

Definitions

  • the present invention relates to a partial high beam module for a motor vehicle headlight according to the preamble of claim 1.
  • a partial high beam module is from DE 10 20011 054 234 A1 famous.
  • the known partial high-beam module has a light source array that has n light sources arranged in pairs adjacent to one another in a row, where n is greater than or equal to 3, and each of the light sources is set up to emit light in a light beam having a main light emission direction.
  • the well-known partial high-beam module has a primary optical field that n Has primary optics sub-areas, each primary optics sub-area having exactly one converging lens, which has a light entry surface and a light exit surface, which is convexly curved in two spatial directions.
  • each converging lens is assigned to exactly one light source and each light source to exactly one converging lens in that the converging lens lies in the light beam emanating from the assigned light source and intersects the main emission direction of this light source.
  • the known partial high-beam module has secondary optics that are set up and arranged to project a light distribution occurring on the light exit surfaces of the primary optics field when the light sources are switched on into a spatial area in front of the headlight.
  • the well-known motor vehicle headlight is used to generate what is known as a glare-free high beam.
  • the darkening takes place automatically on the basis of signals from sensors that detect such road users in front of the vehicle. Examples of such sensors are visible light cameras, infrared radiation sensors and radar sensors.
  • One possibility is a To divide high beam distribution into several adjacent, strip-shaped light fields, each of which is generated by light from one of the light sources and imaging the light exit surface of the converging lens, which is illuminated by this light source.
  • the individual light fields have relatively sharp vertical boundaries. By dimming or switching off individual light sources, it is possible to darken individual fields in the high beam in which oncoming traffic or road users driving ahead are detected.
  • an intermediate image is generated from the light from a number of light sources with the aid of primary optics, the light fields of which are preferably directly adjacent to one another and do not overlap.
  • the light sources are preferably semiconductor light sources, in particular light-emitting diodes, whose luminous flux can be controlled individually for each light-emitting diode and thus for each light source.
  • this intermediate image is projected by secondary optics as an external high beam distribution in front of the vehicle headlight.
  • the secondary optics are usually imaging optics that focus on the intermediate image.
  • the object of the present invention is to specify a motor vehicle headlight as described at the outset the type mentioned, in which an outer light field of the projected light distribution at its outer edge, which is not adjoined by any other light field, has no sharp light-dark boundary and instead has a gradual, to some extent soft transition from the bright light field to a darker one further out area.
  • the optical element introduced in the preamble has a light exit surface which, due to its arrangement lying further outwards, is also imaged further outwards by the secondary optics than the light exit surface of the converging lens of the associated primary optics partial area. Because of this position, the optical element only absorbs light from the light source that is assigned to the converging lens of this primary optics subarea and which light propagates past this converging lens.
  • each converging lens has an optical axis and that the optical axis lies in one line with the main emission direction of the light source that is assigned to this converging lens. This ensures that as much of the light emanating from the light source as possible is absorbed by the converging lens, which has a positive effect on the optical efficiency (amount of light that arrives in the projected light distribution divided by the amount of light emanating from the light source). .
  • the optical element has at least one light exit surface in which straight lines can lie.
  • a light exit surface can be, for example, a flat surface, a cylindrical surface or a conical surface or a partial surface of such a surface.
  • the at least one light exit surface is a section of a conical surface.
  • the optical element has several Has light exit surfaces, each of which is a section of a conical surface and wherein the conical surfaces are arranged concentrically.
  • the geometry of the light exit surfaces is defined during the design and manufacture of the optical element and is therefore variable. This variability opens up degrees of freedom for defining the distribution of light occurring through the optical element, which degrees of freedom are greater than the corresponding degrees of freedom that result from an optical element that has only one light exit surface.
  • the optical element has a reflection surface that can be illuminated by the associated light source.
  • the reflection surface is arranged in such a way that light incident from the associated light source undergoes at least one total internal reflection.
  • a further preferred configuration is characterized in that the secondary optics have at least one concave mirror reflector.
  • the secondary optics has at least one projection lens.
  • each light source has at least one Has semiconductor light source. Due to their small size, semiconductor light sources are particularly suitable for generating a light distribution that is composed of individual light fields whose brightness should be individually controllable.
  • FIG. 1 a motor vehicle headlight 10 with a housing 12, the light exit opening is covered by a transparent cover plate 14.
  • the light exit opening faces a direction of travel x.
  • the y-direction is parallel to a transverse axis of the motor vehicle and the z-direction is parallel to a vertical axis of the motor vehicle.
  • 1 shows the motor vehicle headlight in a plan view, the motor vehicle headlight being cut open and the cutting plane lying horizontally.
  • Each of the light sources is set up to emit light in a light beam 20 having a main light emission direction 18 .
  • the light sources are preferably semiconductor light sources, in particular light-emitting diodes. It is also preferred that the light-emitting diodes have a flat light exit surface.
  • the radiated light bundles then have approximately a Lambertian radiation characteristic, which is represented in each case by the representation of the light bundles 20 as circles. As is well known, the length of the directional arrows within a circle then indicates the radiation intensity prevailing in this direction. In this respect, each circle illustrates a single light bundle 20.
  • Each primary optics section contains a converging lens. The assignment takes place in that a light entry surface of this converging lens lies in the light bundle emanating from this light source and intersects the main light emission direction of this light source. This definition results in a clear assignment.
  • the primary optics field 22 has a light entry side 26 and a light exit side 28 .
  • the shape and arrangement of the individual converging lenses of the primary optics field 22 are preferably designed to reduce the aperture angle of the light incident on them. It is particularly preferred that the converging lenses are shaped and arranged in such a way that the light fields forming on the light exit side 28 of the primary optics field 22 when the light sources are switched on touch but not overlap.
  • a field is individually brightly illuminated or darkened by switching the associated light source on and off. The sum of these light fields represents an inner light distribution, which is converted by a secondary optics 30 into an outer light distribution, which appears in front of the motor vehicle headlight and thus in front of the motor vehicle that has this motor vehicle headlight.
  • the secondary optics can be designed as a converging lens, as a parabolic mirror or as an optical system made up of several lenses and/or mirrors.
  • the secondary optics can also be modified in such a way that vertical and/or horizontal scattering is superimposed on the image of the intermediate image in order to generate a light distribution that conforms to the rules.
  • the internal light distribution is converted into an external light distribution by means of secondary optics 30 by projecting the internal light distribution into a spatial area in front of the motor vehicle headlight.
  • the inner light distribution corresponds to the intermediate image mentioned earlier. If all light sources are switched on at the same time, the result is a high beam distribution.
  • the main beam characteristic results from the fact that an area above the horizon is illuminated.
  • a partial high beam distribution is generated by switching individual light sources on and off.
  • the light source field 16 forms, together with the primary optics field 22 and the secondary optics 30 Partial high-beam module 24.
  • a motor vehicle headlight according to the invention can have additional light modules in addition to one or more partial high-beam modules, for example one or more basic light modules or low-beam modules, without this enumeration being meant to be exhaustive.
  • the semiconductor light sources can be dimmed and/or switched on and off individually.
  • Each semiconductor light source consists of at least one light-emitting diode.
  • the light-emitting diodes are set up to generate white light, as prescribed for headlight light distributions.
  • Semiconductor light sources that emit blue light and are coated with a wavelength converter are used for this purpose. The wavelength converter converts part of the blue light to yellow-red light. The white light is then created by mixing blue and yellow-red light.
  • the light sources are arranged in a row. In the direction of the row, the distance between two adjacent semiconductor light sources increases from the center of the row inwards (in the figure 2 to the left) and outwards (in the figure 2 to the right) to.
  • the outward direction is the positive y-direction.
  • the distances increase more towards the outside than towards the inside.
  • the light sources arranged on the outside in the y-direction in particular the light source 16.8 lying furthest on the outside, are higher in the z-direction than the inner semiconductor light sources, for example the light source 16.4.
  • This arrangement is reversed in the case of the projection taking place through the secondary optics: the light fields generated by the outer semiconductor light sources tend to lie deeper in the z-direction than the light fields generated by the semiconductor light sources lying further inwards.
  • FIG figure 3 shows a primary optical field 22 of a partial high beam module together with a printed circuit board 32 according to FIG figure 2 and a support frame 34 of the primary optics array.
  • the holding frame defines the primary optics field relative to the printed circuit board and is also used to attach the printed circuit board to a heat sink 36 has a light exit surface. At least the light exit surface is convexly curved in two spatial directions.
  • each converging lens is curved in a convex manner in a plane parallel to the xy plane and in a plane parallel to the yz plane.
  • Each converging lens is assigned to exactly one light source and each light source is assigned to exactly one converging lens in that the converging lens lies in the light beam emanating from the assigned light source and intersects the main emission direction of this light source.
  • figure 4 shows a high beam distribution as generated by such a partial high beam module when all semiconductor light sources are switched on.
  • a high beam distribution occurs on a vertical wall 25 m away from the motor vehicle headlight.
  • the degrees characterizing a point of the light distribution indicate the angle that lies between a main emission direction of the motor vehicle headlight and a straight line that goes from the motor vehicle headlight to this point of the light distribution.
  • the closed curves are lines of equal brightness (along each curve). The brightness decreases outwards from curve to curve. The density of the curves is a measure of the brightness gradient.
  • the right and thus the outer end of the light distribution is estimated at approx. 18° (angle in an xy plane to the main direction of emission).
  • the lines of equal brightness are still so dense there that the Light-dark transition is still perceived as abrupt.
  • the figures 5 and 6 show a first exemplary embodiment of a partial high beam module 24 of a motor vehicle headlight according to the invention.
  • these figures show a printed circuit board 32 with a primary optics array 22 which are attached together to a heat sink 36 .
  • figure 5 12 also shows secondary optics 30, with which the internal light distribution occurring on the light exit surfaces of primary optics field 22 is projected in front of the motor vehicle headlight.
  • the secondary optics 30 is a projection lens in the illustrated embodiment. However, the secondary optics can also be implemented as a reflector.
  • the primary optics field 22 is characterized in that a primary optics partial area 22.n arranged furthest to the outside at one end of the row of semiconductor light sources has, in addition to its converging lens 38.n, an optical element 40 arranged even further outside next to its converging lens. Due to its optical properties and its arrangement, the optical element is set up to direct light incident on the secondary optics 30 from the semiconductor light source assigned to this primary optics partial area 22.n.
  • figure 7 shows a horizontal section through an arrangement of a printed circuit board 32 equipped with semiconductor light sources as light sources 16.i with i equal to 1 to n and a primary optics field 22 of a motor vehicle headlight according to the invention.
  • Each converging lens 38.1 to 38.n of the primary optics subregions has an optical axis which lies in a line 42 with the main emission direction of the light source which is assigned to this converging lens.
  • the primary optics subregions have different widths in the horizontal y-direction when used as intended, and they are also projected by the secondary optics with correspondingly different widths.
  • the primary optics partial region 22.n lying furthest to the outside in the y-direction has an optical element 40 in addition to its converging lens 38.n.
  • the optical element 40 consists of arcuate prisms.
  • the area in which the light 44 from the external light source 16.n is bundled and directed in the direction of the secondary optics can be expanded by the prisms. As a desired result, the light field illuminated by the light source 16.n associated with this primary optics portion 22.n becomes wider.
  • the optical element 40 is characterized in that it has at least one light exit surface in which straight lines can lie.
  • the possible straight lines lie in the drawing plane, which is the xy plane here.
  • the prisms also have a shape curved around the perimeter of the outer converging lens. This bending occurs in the yz plane and is in the figures 5 and 6 recognizable.
  • figure 8 shows a high beam distribution generated by a motor vehicle headlight according to the invention.
  • This high beam distribution is overall to the outside (in the figure 8 to the right) wider than the light distribution generated with the known headlight, and the distance between adjacent lines of the same brightness is greater at the outer right edge than in the light distribution generated with the known headlight, which in figure 4 is shown.
  • the outer area of the forefield illuminated by the motor vehicle headlight is more illuminated and the transition from the brightly illuminated area of the light distribution to the dark area is less abrupt, which means that the gradient of the brightness distribution at the outer right edge is less steep than at the light distribution generated with the known headlight.
  • the light distribution of the outermost partial high beam segment is designed in such a way that this partial high beam segment becomes wider and tapers off softly to the side. This achieves better side illumination and annoyingly abrupt light-dark transitions are eliminated in this area.
  • figure 9 shows a second embodiment of a primary optics of a partial high beam module of a motor vehicle headlight according to the invention.
  • the primary optics sub-area arranged furthest to the outside at one end of the row has, in addition to its converging lens 38.n, an optical element 40 which is arranged even further to the outside next to its converging lens 38.n and which is set up to receive light from the light source assigned to this primary optics sub-area Directing light onto the secondary optics.
  • the optical element is implemented here as a catadioptric optical element.
  • FIG 10 shows a horizontal section through an arrangement of a printed circuit board 32 equipped with semiconductor light sources and a primary optics field of the second exemplary embodiment.
  • each converging lens of a primary optics subregion has an optical axis that lies in a line with the main emission direction of the light source that is assigned to this converging lens.
  • the optical element 40 is characterized in that it has a refracting light entry surface, a totally reflecting (or specularly coated) reflection surface 42 and a refracting light exit surface.
  • the optical element has at least one reflection surface 42 in which straight lines can lie. This is the case, for example, when the reflective surface 42 is a section of a conical surface. In this case they are Lines of intersection that arise when a plane containing the central line of the cone's surface intersects the cone's surface, straight lines.
  • the reflection surface 42 is arranged in such a way that light incident from the light source 16.n, which is assigned to this primary optics partial area, experiences at least one total internal reflection, with which the light is directed to the light exit surface of the optical element 40.
  • figure 11 shows a high beam distribution generated with the second embodiment.
  • This high beam distribution is overall towards the outside (in the figure 11 to the right) wider than the light distribution generated with the known headlight, and the distance between adjacent lines of the same brightness is greater at the outer right edge than in the light distribution generated with the known headlight, which in figure 4 is shown.
  • the outer area of the forefield illuminated by the motor vehicle headlight is more illuminated and the transition from the brightly illuminated area of the light distribution to the dark area is less abrupt, which means that the gradient of the brightness distribution at the outer right edge is less steep than at the light distribution generated with the known headlight.
  • the light distribution of the outermost partial high beam segment is designed in such a way that this partial high beam segment becomes wider and tapers off softly to the side. This achieves better side illumination and eliminates annoying abrupt light-dark transitions in this area.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (10)

  1. Module de feu de route partiel (24) pour phare de véhicule automobile (10), comportant un champ de sources de lumière (16) qui présente n sources de lumière (16.1, ..., 16.n) adjacentes par paires et agencées en une rangée, où n est supérieur ou égal à 3 et chacune des sources de lumière est configurée pour émettre de la lumière dans un faisceau de lumière (20) présentant une direction d'émission de lumière principale (18), comportant un champ d'optique primaire (22) qui présente n zones partielles d'optique primaire (22.1, ..., 22.n), où chaque zone partielle d'optique primaire présente précisément une lentille convergente (38.1, ..., 38.n) présentant une surface d'entrée de lumière et une surface de sortie de lumière, qui est incurvée de manière convexe dans deux directions spatiales, chaque lentille convergente étant précisément associée à une source de lumière et chaque source de lumière étant précisément associée à une lentille convergente en ce que la lentille convergente se trouve dans le faisceau de lumière émanant de la source de lumière associée et coupe la direction d'émission principale de cette source de lumière, et comportant une optique secondaire (30) qui est configurée et agencée pour projeter une distribution de lumière se réglant sur les surfaces de sortie de lumière du champ d'optique primaire lorsque les sources de lumière sont activées et présentant une pluralité de champs de lumière en forme de bandes mutuellement adjacents dans une région spatiale devant le phare, chaque champ de lumière projeté étant produit par de la lumière provenant de l'une des sources de lumière et une représentation de la surface de sortie de lumière de la lentille convergente qui est éclairée par cette source de lumière, où une zone partielle d'optique primaire (22.n) agencée la plus à l'extérieur à une extrémité de la rangée présente, en plus de sa lentille convergente (38.n), un élément optique supplémentaire (40) agencé à côté de sa lentille convergente, caractérisé en ce que l'élément optique (40) est configuré pour diriger la lumière incidente provenant de la source de lumière associée à cette zone partielle d'optique primaire (22.n), qui se propage au-delà de cette lentille convergente, sur l'optique secondaire, l'intensité de cette lumière étant faible par rapport à la lumière déviée par la lentille convergente et diminuant vers l'extérieur, de sorte qu'il en découle un champ de lumière pour la zone partielle d'optique primaire extérieure qui est fortement limité au champ de lumière adjacent suivant de la zone partielle d'optique primaire adjacente suivante et qui n'est pas fortement limité vers l'extérieur mais passe avec une luminosité diminuant progressivement dans la zone non éclairée encore plus extérieure.
  2. Module de feu de route partiel (24) selon la revendication 1, caractérisé en ce que chaque lentille convergente (38.1, ..., 38.n) présente un axe optique, et en ce que l'axe optique est aligné avec la direction d'émission principale de la source de lumière qui est associée à cette lentille convergente.
  3. Module de feu de route partiel (24) selon la revendication 1 ou 2, caractérisé en ce que l'élément optique (40) présente au moins une surface de sortie de lumière, dans laquelle peuvent se trouver des droites.
  4. Module de feu de route partiel (24) selon l'une des revendications précédentes, caractérisé en ce que la surface de sortie de lumière, au moins au nombre de une, est une découpe d'une surface d'enveloppe conique.
  5. Module de feu de route partiel (24) selon l'une des revendications 1 à 3, caractérisé en ce que l'élément optique (40) présente une pluralité de surfaces de sortie de lumière, chacune d'elles étant une découpe d'une surface d'enveloppe conique et les surfaces d'enveloppe coniques étant concentriques.
  6. Module de feu de route partiel (24) selon l'une des revendications précédentes, caractérisé en ce que l'élément optique (40) présente une surface de réflexion qui peut être éclairée par la source de lumière associée.
  7. Module de feu de route partiel (24) selon la revendication 1 ou 2, caractérisé en ce que la surface de réflexion est agencée de telle sorte que la lumière incidente provenant de la source de lumière associée subit au moins une réflexion interne totale.
  8. Module de feu de route partiel (24) selon l'une des revendications précédentes, caractérisé en ce que l'optique secondaire (30) comporte au moins un réflecteur à miroir concave.
  9. Module de feu de route partiel (24) selon l'une des revendications précédentes, caractérisé en ce que l'optique secondaire (30) présente au moins une lentille de projection.
  10. Module de feu de route partiel (24) selon au moins l'une des revendications précédentes, caractérisé en ce que chaque source de lumière (16.1, ..., 16.n) présente au moins une source de lumière à semi-conducteur.
EP20165557.8A 2019-03-29 2020-03-25 Module de feu de route partiel pour un phare de véhicule automobile Active EP3719391B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019108232.3A DE102019108232A1 (de) 2019-03-29 2019-03-29 Teilfernlichtmodul für einen Kraftfahrzeugscheinwerfer

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EP3719391A1 EP3719391A1 (fr) 2020-10-07
EP3719391B1 true EP3719391B1 (fr) 2022-05-04

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DE (1) DE102019108232A1 (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004043706B4 (de) * 2004-09-09 2010-04-01 Oec Ag Optisches System für einen Kraftfahrzeugscheinwerfer, Beleuchtungseinheit für einen Kraftfahrzeugscheinwerfer und Kraftfahrzeugscheinwerfer
DE102011006380A1 (de) * 2011-03-29 2012-10-04 Automotive Lighting Reutlingen Gmbh Kraftfahrzeugscheinwerfer mit einer Halbleiterlichtquelle
DE102011054234B4 (de) * 2011-10-06 2020-03-12 HELLA GmbH & Co. KGaA Beleuchtungsvorrichtung
DE102013214116C5 (de) * 2013-07-18 2018-07-05 Automotive Lighting Reutlingen Gmbh Scheinwerfer für ein blendungsfreies Fernlicht
DE102014215785B4 (de) * 2014-08-08 2016-03-31 Automotive Lighting Reutlingen Gmbh Projektionslichtmodul für einen Kraftfahrzeugscheinwerfer

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DE102019108232A1 (de) 2020-10-01

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