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EP3128225B1 - Lighting system for motor vehicle headlight comprising a compact lighting module - Google Patents

Lighting system for motor vehicle headlight comprising a compact lighting module Download PDF

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Publication number
EP3128225B1
EP3128225B1 EP16181946.1A EP16181946A EP3128225B1 EP 3128225 B1 EP3128225 B1 EP 3128225B1 EP 16181946 A EP16181946 A EP 16181946A EP 3128225 B1 EP3128225 B1 EP 3128225B1
Authority
EP
European Patent Office
Prior art keywords
light
guide
lighting system
guides
optical device
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.)
Active
Application number
EP16181946.1A
Other languages
German (de)
French (fr)
Other versions
EP3128225A1 (en
Inventor
Pierre Albou
Marine Courcier
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.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
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Filing date
Publication date
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Publication of EP3128225A1 publication Critical patent/EP3128225A1/en
Application granted granted Critical
Publication of EP3128225B1 publication Critical patent/EP3128225B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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]
    • F21S41/143—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
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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
    • F21S41/29—Attachment thereof
    • F21S41/295—Attachment thereof specially adapted to projection lenses

Definitions

  • the invention relates to lighting devices such as headlamps for motor vehicles.
  • the high beam function provides illumination of the entire width of the road in front of the vehicle.
  • the low beam function provides illumination of the lane in which the vehicle is located and reduced illumination of the adjacent lane in which vehicles are likely to be driving in the opposite direction. In this way, the occupants of the latter are not dazzled.
  • the dipped-beam function in its most usual form does not in certain cases make it possible to illuminate sufficiently far the side of the road located beyond this adjacent lane. However, this constitutes a source of danger. For example, if a pedestrian located on this shoulder is about to cross the road, he will not be seen early enough by the driver.
  • an adaptive light function has been proposed which enables certain parts of the scene located in front of the vehicle and in particular the side located beyond the adjacent lane to be illuminated at a great distance and selectively.
  • an observation device analyzes the scene and selects the areas to be illuminated.
  • the lighting system of DE-10 2011 053 232 comprises a lighting module comprising light sources and light guides produced in separable parts, each guide being coupled to a light source and able to guide the light emitted by the sources towards the front of the vehicle.
  • each guide is able to form, from the light emitted by the light source with which it is coupled, a light pixel on the scene in front of the vehicle.
  • each guide being produced by a separate part, it is necessary to fix each of the guides has a support of the lighting system. This constitutes long and tedious operations, and an additional cost due to the fact that it is necessary to provide fixing means for fixing all the light guides.
  • the large number of light guides requires numerous operations for adjusting the positioning and orientation of the light guides relative to one another so that the selective beam correctly cuts the scene in front of the vehicle. This constitutes other long and tedious operations.
  • the separate parts forming the various light guides being numerous and of relatively small dimensions, it is not easy to handle them with a view to their installation in the lighting system.
  • An object of the invention is to overcome these drawbacks and therefore to reduce the number of parts contained in the lighting system, without however reducing the number of light guides and harming the operation of the lighting system.
  • the light guides are made in two parts only regardless of the number of light sources and light guides. This makes it possible to reduce the number of adjustment operations which it is necessary to perform, whether they are operations for adjusting the positioning of the light guides with respect to each other. others or operations of fixing the light guides to a support of the lighting system.
  • the two parts forming the guides are easier to handle than the separable light guides of the prior art because the parts are larger than the separable guides.
  • the light guides are distributed over the first and second guide pieces so that, considering the direction of alignment of the light sources, the light guides carried by the first guide piece alternate with the light guides carried. by the second guide piece.
  • each guide piece in section in a plane parallel to the plane defined by the straight line defining the direction of alignment and an optical axis of the optical projection device, has the general shape of a comb comprising teeth forming the light guides, and hollows alternating with the teeth.
  • the guide pieces thus have a simple shape which makes it possible to simply fit the guide pieces into one another, the teeth of the pieces forming the light guides.
  • a free surface of the first guide piece has reliefs for folding down the light beams intended to focus the light rays emitted by each light source towards the light guide with which it is coupled.
  • the guide parts are made of the same material, such as only silicone, these two guide pieces being fixed to one another by means of an adhesive having an optical index close to that of the material in which the guide pieces are made.
  • the glue fills any air pockets trapped between the nested guide pieces, this material not substantially deflecting the light propagating in the light guides. Due to manufacturing tolerances, the air pockets have different sizes and shapes. As a result, they deflect the light in the different guides in different ways, and the light spots are then distorted. Thanks to the glue, the deviations do not take place, or are then weak, and therefore the light spots all have the same shape. Furthermore, the glue makes it possible to effectively secure the two guide pieces to one another.
  • Another solution consists in deliberately leaving a thin layer of air where it is inevitable in the absence of glue between the ends of the guides of the first guide part and the optical projection device. These layers only cause losses by vitreous reflection which can be compensated for by the flow of the corresponding light sources, for example by choosing sources having a “bin” code, or luminosity code, greater than that of the light sources opposite. light guides of the second guide piece or by supplying these light sources with a current greater than the current supplying the light sources opposite the light guides of the second guide piece.
  • the second guide part is molded onto the free surface of the optical projection device or integrally formed therefrom.
  • two adjacent light guides are separated by an air space.
  • each light guide has, in any plane perpendicular to the optical axis of the optical projection device, a section of polygonal shape, generally rectangular or trapezoidal, with two horizontal sides and two vertical or oblique sides.
  • This cross-sectional shape of the light guides is conducive to guiding the light and is also simply achievable.
  • each guide associated with a light source is delimited by two said end contour lines, preferably two straight segments, imposing the shape of two longitudinal ends of the light strip generated by the light source associated with the guide, these two end contour lines being located at a distance from a focal surface of the optical projection device.
  • each light strip generated by the lighting system are blurred.
  • the gradient of light intensity in these areas is low, and the transition between the illuminated areas and the unlit areas is smooth.
  • each guide associated with a light source is delimited by two so-called lateral contour lines, preferably two straight segments, imposing the shape of two lateral edges of the light strip generated by the light source associated with the guide, these two lateral contour lines being substantially included in the focal plane of the optical projection device.
  • the light strips generated by the lighting system have sharp side edges. This prevents the light bands from overlapping, which could adversely affect the operation of the lighting system.
  • This lighting system 1 comprises a lighting module 2.
  • This lighting module 2 comprises a set 4 of light sources 6, and means 8 for guiding the light emitted by the light sources 6.
  • the means of guide 8 guide the light towards an optical projection device 10 intended to project the light which is emitted by the light sources 6 and which is guided by the guide means 8 outside the lighting system 1, towards the front of the vehicle.
  • the optical projection device 10 is here formed by a projection lens in the general shape of a hemisphere.
  • the lens has a free surface 12 in the form of a disc.
  • the lens has an optical axis 10A substantially parallel to the X direction and a focal surface 10P here plane, the free surface 12 of the lens being located at a distance from the focal surface 10P.
  • a complementary optical projection device 14 such as a projection lens can be placed in front of the optical projection device 10 by considering the trajectory of the light emitted by the light sources 6.
  • the light sources 6 each comprise a light emitting diode optionally of the laser diode type, emitting substantially monochromatic light.
  • Each laser diode is coupled to wavelength converting means for converting substantially monochromatic light to white light.
  • These wavelength conversion means are for example constituted by a block, in the form of a rectangular parallelepiped, of wavelength converter material, for example a phosphorescent or luminescent material, such as YAG crystals (Yttrium Aluminum Garnet). doped with rare earths, zinc sulphide (ZnS), etc.
  • White light is emitted by the wavelength converting means from a surface of these means.
  • the light sources 6 each have a generally rectangular light emitting face. These light emitting faces are substantially centered on the same straight line defining a direction of alignment 16 of the light sources 6 substantially parallel to two opposite sides of each light emitting face.
  • the alignment direction 16 is substantially parallel to the Y direction.
  • the number of light sources 6 is preferably greater than or equal to three and the highest possible, each source 6 producing one of the light spots forming lighting.
  • the light guide means 8 are placed opposite the light emitting faces of the light sources 6. They are intended to guide the light emitted by each light source 6 towards the optical projection device 10.
  • the means of light guide 8 comprise light guides 18 in number equal to the number of light sources 6.
  • Each light guide 18 is coupled with a light source 6, and conversely each light source 6 is coupled with a light guide 18
  • the light guides 18 are arranged so as to form, from the light emitted by the light sources 6 and in cooperation with the projection optical device 10, one light spot per light source 6, each light spot having a light strip shape. We will see below how these light spots are generated.
  • each guide piece 20, 22 has the general shape of a comb comprising teeth forming the light guides 18, and recesses alternating with the teeth.
  • the teeth of the first guide piece 20 are able to penetrate into the recesses of the second guide piece 22, and conversely, the teeth of the second guide piece 22 are able to penetrate into the recesses of the first guide piece 20.
  • the guide pieces 20, 22 thus fit together effectively while minimizing the air volumes between the guide pieces 20, 22.
  • the two guide pieces 20, 22 are made of the same material, such as silicone or polycarbonate. These two guide pieces 20, 22 are for example fixed to one another by means of an adhesive having an optical index close to that of the material in which the guide pieces are made. This ensures that any air pockets located between the two guide pieces 20, 22 are filled with this adhesive. Given that it has an optical index close to that of the material of the guide pieces 20, 22, for example equal to plus or minus 0.1, the glue only slightly deflects the light propagating in the guide means 8 relative to the desired trajectory. It is also possible to provide for not having to resort to an adhesive and to use any other fixing means known to those skilled in the art. These fixing means may in particular extend over the side surfaces of the guide pieces 20, 22, that is to say those extending substantially perpendicular to the vertical direction Z. In fact, in this position, the fixing means would not hinder the propagation of light in the lighting system 1.
  • the light guides 18 are distributed over the first 20 and second 22 guide pieces so that, considering the direction of alignment 16 of the light sources 6, the light guides 18 carried by the first guide piece 20 alternate with the light guides 18 carried by the second guide piece 22.
  • Such an arrangement makes it possible to increase the contact surfaces between the two guide pieces 20, 22 and therefore to improve the fixing of the guide pieces 20, 22 the one with the other.
  • the first guide piece 20 is placed opposite the light emitting faces.
  • a free surface of the first guide piece 20 has reliefs for folding down the light beams 24 intended to focus the light rays emitted by each light source 6 towards the light guide 18 with which it is coupled.
  • These folding reliefs 24 form light entry surfaces in the light guides 18.
  • These folding reliefs 24 form converging diopters and are able to focus the light emitted by each light source 6 towards the interior of the guide. light 18 with which the source 6 is coupled. It follows that one increases the quantity of light which penetrates inside the light guides 18 in order to increase the light intensity of the beam exiting the lighting system 1 and that one avoids as much as possible d 'injecting light from a light source 6 to the light guides 18 adjacent to the one paired with it.
  • the F beams shown on the figure 2 illustrate the effects of folding reliefs 24.
  • the second guide piece 22 is attached to the free surface 12 of the optical projection device 10.
  • the second guide piece 22 is overmolded on the free surface 12 of the optical projection device 10. Thanks to the overmolding, it It is not necessary to provide fixing means specifically dedicated to fixing the second guide piece 22 on the free surface 12. It is nevertheless possible to provide for fixing the second guide piece 22 on the free surface 12 by any other means. . Provision can also be made for the second guide piece 22 to be integral with the projection lens.
  • the second guide piece 22 is overmolded on the free surface 12 of the optical projection device 10 in a manner known per se.
  • the teeth of the second guide piece 22 are molded slightly undercut.
  • the first guide part 20 is formed, for example by molding, giving the teeth of this first guide part 20 undercut shapes. Indeed, referring to the figure 4 , it can be seen that all the teeth of the first guide piece 20 are molded against the undercut. The shape of the light guides 18 and therefore those of the light spots generated by the lighting system 1 is modified in this way. These undercuts are permitted by the release axis of the guide piece 20, perpendicular to the plane of the figure 4 .
  • the engagement of the first guide part 20 in the second guide part 22 is effected by translation parallel to the Z direction.
  • the undercut molding of the first guide piece 20 makes it possible to provide an air space 25 between each light guide 18, these air spaces 25 being intended to separate the light guides 18.
  • Each air space 25 has a thickness of the order of a few tens of micrometers on average.
  • the undercut shape of the first guide piece 20 also allows the light guides 18 to better guide light because such a shape reduces the maximum angle at which a light ray propagating in a guide 18 can meet a side wall. of said guide 18, that is to say a normal wall substantially included in a horizontal plane.
  • the molding operations described above allow the guide pieces 20, 22 to have almost zero play relative to each other, generally of the order of 200 ⁇ m or less, depending on the machining tolerances. applied.
  • glue is added to the recesses of the second guide piece 22 before fitting the first guide piece 20 therein to avoid the presence of undesirable air pockets between the two guide pieces 20, 22.
  • each light guide 18 has, in any plane perpendicular to the optical axis 10A of the projection device 10, a generally rectangular section with two horizontal sides and two vertical sides.
  • the light spots generated by the lighting system 1 each have the overall shape of a rectangle, although the undercut molding of the first guide piece 20 gives each light spot a substantially trapezoidal shape.
  • each guide 18 associated with a light source 6 is delimited by two so-called end contour lines, here two straight segments, imposing the shape of two longitudinal ends of the light strip generated by the light source 6 associated with the guide 18, these two end contour lines being located at a distance from the focal plane 10P of the optical projection device 10.
  • each guide 18 associated with a light source 6 is delimited by two so-called lateral contour lines, preferably two straight segments, imposing the shape of two lateral edges of the strip.
  • light 26 generated by the light source 6 associated with the guide 18, these two lateral contour lines being substantially included in the focal surface 10P of the optical projection device 10.
  • the figure 7 illustrates the light spots 26 generated by the lighting system 1 according to the second embodiment of the invention.
  • Each light spot 26 has the general shape of a light strip that is substantially rectangular and elongated in the vertical direction Z.
  • Each light spot 26 has side edges that are slightly inclined with respect to the vertical direction Z, at an angle approximately equal to a few degrees. This inclination is caused by the undercut molding of the first guide piece 20 and by the undercut molding of the second guide piece 22. These properties of the light spots 26 are also obtained for a lighting system 1. according to the first embodiment of the invention.
  • each strip 26 is sharp while the end edges of each strip 26 are blurred.
  • the light bands 26 are clearly demarcated from one another so that they do not overlap, and the light intensity transitions at the high and low ends of the light bands 26 are smooth, which improves the comfort of the light. view of the driver of the vehicle.
  • the degree of sharpness of a cut-off or of the edge of a light strip is determined by measuring the contrast G at the cut-off line, according to the regulatory method of measuring the sharpness of the cut-offs of the beams d. switching off lighting for motor vehicles.
  • a measuring screen is placed 25 m from the lighting system and the illumination value E ⁇ (in lux) at an angle ⁇ given on one side of the cut-off and the illumination value E ⁇ is noted. +0.1 ° at an angle ⁇ + 0.1 °, located on the other side of the cutoff.
  • the contrast G is equal to log E ⁇ - log E ⁇ + 0.1 °. If G is greater than 0.13 then the cutoff is clear.
  • the fact that the two side contour lines are substantially included in the focal surface 10P is the reason why the side ends of each light strip 26 are sharp.
  • the two lateral contour lines are substantially included in the straight lines represented by the lines 30 and 30 '.
  • Each light guide 18 has such straight lines. They are also visible on the figures 7 to 9 .
  • the fact that the two end contour lines are placed away from the focal plane 10P is the reason why the high and low ends of the light bands 26 are blurred.
  • the two end contour lines are substantially included in the straight lines represented by the broken lines 28 and 28 '. These two lines are common to all the light guides 18. These two lines are also visible on the figures 7 to 9 .
  • the lighting system can be fitted with several lighting modules such as that described in the foregoing, for example to generate a larger number of light bands or else to fill in the dark areas located between the light bands generated by a module. lighting.
  • the light guides should have different lengths so that the light entry surfaces of the light guides are centered on a planar curve located in a plane perpendicular to the vertical direction Z and so that the face d the light emission of each light source is located at the same distance from the light guide to which it is associated. In this way, the shape of the optical projection device is optimized.

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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)

Description

L'invention concerne les dispositifs d'éclairage tels que les projecteurs pour véhicules automobiles.The invention relates to lighting devices such as headlamps for motor vehicles.

Il est connu de prévoir sur un véhicule automobile des fonctions d'éclairage en feux de route et en feux de croisement. La fonction feu de route fournit un éclairage de toute la largeur de la route devant le véhicule. La fonction feu de croisement fournit un éclairage de la voie dans laquelle se trouve le véhicule et un éclairage réduit de la voie située à côté et dans laquelle des véhicules sont susceptibles de rouler en sens inverse. De la sorte, les occupants de ces derniers ne sont pas éblouis. Toutefois, la fonction feu de croisement dans sa forme la plus habituelle ne permet pas dans certains cas d'éclairer suffisamment loin le bas-côté de la route situé au-delà de cette voie adjacente. Or cela constitue une source de danger. Par exemple, si un piéton situé sur ce bas-côté s'apprête à traverser la route, il ne sera pas vu suffisamment tôt par le conducteur. Pour y remédier, on a proposé une fonction de feu adaptatif qui permet d'éclairer à grande distance et sélectivement certaines parties de la scène située devant le véhicule et en particulier le bas-côté situé au-delà de la voie adjacente. A cette fin, un dispositif d'observation analyse la scène et sélectionne les zones qui doivent être éclairées.It is known practice to provide high beam and low beam lighting functions on a motor vehicle. The high beam function provides illumination of the entire width of the road in front of the vehicle. The low beam function provides illumination of the lane in which the vehicle is located and reduced illumination of the adjacent lane in which vehicles are likely to be driving in the opposite direction. In this way, the occupants of the latter are not dazzled. However, the dipped-beam function in its most usual form does not in certain cases make it possible to illuminate sufficiently far the side of the road located beyond this adjacent lane. However, this constitutes a source of danger. For example, if a pedestrian located on this shoulder is about to cross the road, he will not be seen early enough by the driver. To remedy this, an adaptive light function has been proposed which enables certain parts of the scene located in front of the vehicle and in particular the side located beyond the adjacent lane to be illuminated at a great distance and selectively. To this end, an observation device analyzes the scene and selects the areas to be illuminated.

Pour cela, il est connu notamment de découper fictivement cette scène en plusieurs bandes rectangulaires verticales qui sont éclairées sélectivement suivant les parties de la scène que l'on souhaite éclairer, comme cela est décrit dans le document DE-10 2011 053 232 .For this, it is known in particular to fictitiously cut this scene into several vertical rectangular bands which are selectively illuminated depending on the parts of the scene that one wishes to illuminate, as described in the document. DE-10 2011 053 232 .

Le système d'éclairage de DE-10 2011 053 232 comprend un module d'éclairage comportant des sources de lumière et des guides de lumière réalisés dans des pièces séparables, chaque guide étant couplé à une source de lumière et apte à guider la lumière émise par les sources vers l'avant du véhicule. De la sorte, chaque guide est apte à former, à partir de la lumière émise par la source de lumière avec laquelle il est couplé, un pixel lumineux sur la scène devant le véhicule. En activant et en désactivant les sources de lumière sélectivement suivant les parties de la scène que l'on souhaite éclairer et celles que l'on souhaite maintenir non éclairées, on réalise un éclairage sélectif de la scène.The lighting system of DE-10 2011 053 232 comprises a lighting module comprising light sources and light guides produced in separable parts, each guide being coupled to a light source and able to guide the light emitted by the sources towards the front of the vehicle. In this way, each guide is able to form, from the light emitted by the light source with which it is coupled, a light pixel on the scene in front of the vehicle. By activating and deactivating the light sources selectively depending on the parts of the scene which one wishes to illuminate and those which one wishes to keep unlit, selective lighting of the scene is achieved.

Toutefois, ce système d'éclairage pose certains problèmes.However, this lighting system poses certain problems.

En effet, chaque guide étant réalisé par une pièce séparée, il est nécessaire de fixer chacun des guides à un support du système d'éclairage. Cela constitue des opérations longues et fastidieuses, et un surcoût du fait qu'il est nécessaire de prévoir des moyens de fixation pour fixer tous les guides de lumière. De plus, le nombre important de guides de lumière impose de nombreuses opérations de réglages du positionnement et de l'orientation des guides de lumière les uns par rapport aux autres afin que le faisceau sélectif découpe correctement la scène devant le véhicule. Ceci constitue d'autres opérations longues et fastidieuses. Enfin, les pièces séparées formant les différents guides de lumière étant nombreuses et de relativement petites dimensions, il n'est pas aisé de les manipuler en vue de leur installation dans le système d'éclairage.Indeed, each guide being produced by a separate part, it is necessary to fix each of the guides has a support of the lighting system. This constitutes long and tedious operations, and an additional cost due to the fact that it is necessary to provide fixing means for fixing all the light guides. In addition, the large number of light guides requires numerous operations for adjusting the positioning and orientation of the light guides relative to one another so that the selective beam correctly cuts the scene in front of the vehicle. This constitutes other long and tedious operations. Finally, the separate parts forming the various light guides being numerous and of relatively small dimensions, it is not easy to handle them with a view to their installation in the lighting system.

D'autres systèmes d'éclairage sont divulgués dans les documents WO 2015061819 A et EP 2743567 A .Other lighting systems are disclosed in the documents WO 2015061819 A and EP 2743567 A .

Un but de l'invention est de pallier ces inconvénients et donc de réduire le nombre de pièces contenues dans le système d'éclairage, sans pour autant réduire le nombre de guides de lumière et nuire au fonctionnement du système d'éclairage.An object of the invention is to overcome these drawbacks and therefore to reduce the number of parts contained in the lighting system, without however reducing the number of light guides and harming the operation of the lighting system.

A cet effet, on prévoit selon l'invention un système d'éclairage pour véhicule automobile comprenant au moins un module d'éclairage comportant :

  • des sources de lumière comportant chacune une face de forme générale rectangulaire d'émission de lumière, les faces d'émission de lumière étant sensiblement centrées sur une même ligne, notamment droite, définissant une direction d'alignement des sources de lumière sensiblement parallèle à deux côtés opposés de chaque face d'émission de lumière, et
  • un dispositif optique de projection,
caractérisé en ce que le module d'éclairage comporte en outre des guides de lumière, chaque guide de lumière étant couplé avec une des sources de lumière,
les guides de lumière étant répartis sur des première et seconde pièces de guidage distinctes de formes complémentaires, emboîtées l'une dans l'autre,
la première pièce de guidage étant placée en regard des faces d'émission de lumière,
la seconde pièce de guidage étant rapportée sur une surface libre du dispositif optique de projection,
les guides de lumière étant agencés de manière à former, à partir de la lumière émise par les sources de lumière et en coopération avec le dispositif optique de projection, une tache lumineuse par source de lumière, chaque tache lumineuse ayant une forme de bande lumineuse.To this end, according to the invention there is provided a lighting system for a motor vehicle comprising at least one lighting module comprising:
  • light sources each comprising a generally rectangular light emitting face, the light emitting faces being substantially centered on the same line, in particular straight, defining a direction of alignment of the light sources substantially parallel to two opposite sides of each light emitting face, and
  • an optical projection device,
characterized in that the lighting module further comprises light guides, each light guide being coupled with one of the light sources,
the light guides being distributed over first and second distinct guide pieces of complementary shapes, nested one inside the other,
the first guide piece being placed opposite the light emitting faces,
the second guide piece being attached to a free surface of the optical projection device,
the light guides being arranged so as to form, from the light emitted by the light sources and in cooperation with the optical projection device, one light spot per light source, each light spot having the shape of a light strip.

Ainsi, les guides de lumière sont réalisés dans deux pièces uniquement quelque soit le nombre de sources de lumière et de guides de lumière. Cela permet de réduire le nombre d'opérations de réglage qu'il est nécessaire d'effectuer, que ce soit des opérations de réglage du positionnement des guides de lumière les uns par rapport aux autres ou bien des opérations de fixation des guides de lumière à un support du système d'éclairage. De plus, les deux pièces formant les guides sont plus simples à manier que les guides de lumière séparables de l'art antérieur car les pièces sont plus grandes que les guides séparables.Thus, the light guides are made in two parts only regardless of the number of light sources and light guides. This makes it possible to reduce the number of adjustment operations which it is necessary to perform, whether they are operations for adjusting the positioning of the light guides with respect to each other. others or operations of fixing the light guides to a support of the lighting system. In addition, the two parts forming the guides are easier to handle than the separable light guides of the prior art because the parts are larger than the separable guides.

On évite ainsi également les inconvénients d'un système d'éclairage de l'art antérieur dans lequel les guides de lumière sont tous venus de matière avec le dispositif optique de projection. En effet, dans un tel système d'éclairage, il est difficile de mouler des lames d'air entre les guides de lumière qui ont pour fonction de séparer les guides. Par ailleurs, un tel procédé de moulage ne permet pas de d'obtenir des rayons de jonction convenables au niveau de la surface, fictive, de jonction entre le dispositif optique de projection et les guides de lumière. Ces problèmes sont résolus par l'invention, puisqu'on n'a pas recourt à un moulage de tous les guides sur le dispositif optique de projection.This also avoids the drawbacks of a lighting system of the prior art in which the light guides are all integral with the optical projection device. In fact, in such a lighting system, it is difficult to mold air sheets between the light guides which have the function of separating the guides. Furthermore, such a molding process does not make it possible to obtain suitable junction radii at the level of the fictitious junction surface between the optical projection device and the light guides. These problems are solved by the invention, since it is not necessary to have recourse to molding all of the guides on the optical projection device.

Avantageusement, les guides de lumière sont répartis sur les première et seconde pièces de guidage de façon qu'en considérant la direction d'alignement des sources de lumière, les guides de lumière portés par la première pièce de guidage alternent avec les guides de lumière portés par la seconde pièce de guidage.Advantageously, the light guides are distributed over the first and second guide pieces so that, considering the direction of alignment of the light sources, the light guides carried by the first guide piece alternate with the light guides carried. by the second guide piece.

Avantageusement, en section dans un plan parallèle au plan défini par la droite définissant la direction d'alignement et un axe optique du dispositif optique de projection, chaque pièce de guidage a une forme générale de peigne comportant des dents formant les guides de lumière, et des creux alternant avec les dents.Advantageously, in section in a plane parallel to the plane defined by the straight line defining the direction of alignment and an optical axis of the optical projection device, each guide piece has the general shape of a comb comprising teeth forming the light guides, and hollows alternating with the teeth.

Les pièces de guidage présentent ainsi une forme simple qui permet d'emboîter simplement les pièces de guidage l'une dans l'autre, les dents des pièces formant les guides de lumière.The guide pieces thus have a simple shape which makes it possible to simply fit the guide pieces into one another, the teeth of the pieces forming the light guides.

Avantageusement, une surface libre de la première pièce de guidage présente des reliefs de rabattement des faisceaux lumineux destinés à focaliser les rayons lumineux émis par chaque source de lumière vers le guide de lumière avec lequel elle est couplée.Advantageously, a free surface of the first guide piece has reliefs for folding down the light beams intended to focus the light rays emitted by each light source towards the light guide with which it is coupled.

On s'assure ainsi qu'un maximum de lumière émise par les sources de lumière est dirigée au maximum vers l'intérieur des guides de lumière. On évite ainsi que la lumière émise par une source de lumière ne pollue la tache lumineuse engendrée par une autre source de lumière. En d'autres termes, on évite le phénomène indésirable de couplage parasite des taches lumineuses, également dit de « crosstalk » en langue anglaise. On réduit également les pertes en intensité lumineuse dans le faisceau lumineux sortant du système d'éclairage.This ensures that a maximum of light emitted by the light sources is directed as much as possible towards the interior of the light guides. This prevents the light emitted by one light source from polluting the light spot generated by another light source. In other words, the undesirable phenomenon of parasitic coupling of light spots, also called “crosstalk” in English, is avoided. The losses in light intensity in the light beam leaving the lighting system are also reduced.

Avantageusement, les pièces de guidage sont réalisées dans un même matériau, tel que du silicone, ces deux pièces de guidages étant fixées l'une à l'autre au moyen d'une colle présentant un indice optique proche de celui du matériau dans lequel sont réalisées les pièces de guidage.Advantageously, the guide parts are made of the same material, such as only silicone, these two guide pieces being fixed to one another by means of an adhesive having an optical index close to that of the material in which the guide pieces are made.

Ainsi, la colle comble les éventuelles poches d'air piégées entre les pièces de guidage emboîtées, ce matériau ne déviant sensiblement pas la lumière se propageant dans les guides de lumière. Du fait des tolérances de fabrication, les poches d'air présentent des tailles et des formes différentes. De ce fait, elles dévient la lumière dans les différents guides de différentes manières, et les taches lumineuses sont alors déformées. Grâce à la colle, les déviations n'ont pas lieu, ou alors sont faibles, et donc les taches lumineuses présentent toutes la même forme. Par ailleurs, la colle permet de solidariser efficacement les deux pièces de guidage l'une avec l'autre.Thus, the glue fills any air pockets trapped between the nested guide pieces, this material not substantially deflecting the light propagating in the light guides. Due to manufacturing tolerances, the air pockets have different sizes and shapes. As a result, they deflect the light in the different guides in different ways, and the light spots are then distorted. Thanks to the glue, the deviations do not take place, or are then weak, and therefore the light spots all have the same shape. Furthermore, the glue makes it possible to effectively secure the two guide pieces to one another.

Une autre solution consiste à ménager volontairement une fine couche d'air là ou elle est inévitable en l'absence de colle entre les extrémités des guides de la première pièce de guidage et le dispositif optique de projection. Ces couches ne provoquent que des pertes par réflexion vitreuse qui peuvent être compensées par le flux des sources de lumière correspondantes, par exemple en choisissant des sources présentant un code « bin », ou code de luminosité, supérieur à celui des sources de lumière en regard des guides de lumière de la deuxième pièce de guidage ou en alimentant ces sources de lumière à un courant supérieur au courant alimentant les sources de lumière en regard des guides de lumière de la deuxième pièce de guidage.Another solution consists in deliberately leaving a thin layer of air where it is inevitable in the absence of glue between the ends of the guides of the first guide part and the optical projection device. These layers only cause losses by vitreous reflection which can be compensated for by the flow of the corresponding light sources, for example by choosing sources having a “bin” code, or luminosity code, greater than that of the light sources opposite. light guides of the second guide piece or by supplying these light sources with a current greater than the current supplying the light sources opposite the light guides of the second guide piece.

Avantageusement, la deuxième pièce de guidage est surmoulée sur la surface libre du dispositif optique de projection ou venue de matière de celui-ci.Advantageously, the second guide part is molded onto the free surface of the optical projection device or integrally formed therefrom.

Il n'est ainsi pas nécessaire de prévoir des moyens de fixation de la deuxième pièce de guidage au dispositif optique, ce qui permet de réduire le coût de fabrication du système d'éclairage.It is thus not necessary to provide means for fixing the second guide part to the optical device, which makes it possible to reduce the manufacturing cost of the lighting system.

Avantageusement et de préférence, deux guides de lumière adjacents sont séparés par une lame d'air.Advantageously and preferably, two adjacent light guides are separated by an air space.

On assure ainsi simplement la séparation des guides de lumière, sans moyens encombrants et on évite la transmission de rayons parasites d'un guide adjacent à un autre.The separation of the light guides is thus simply ensured, without bulky means, and the transmission of parasitic rays from one guide adjacent to another is avoided.

Avantageusement, chaque guide de lumière présente, dans tout plan perpendiculaire à l'axe optique du dispositif optique de projection, une section de forme polygonale, généralement rectangulaire ou trapézoidale, à deux côtés horizontaux et deux côtés verticaux ou obliques.Advantageously, each light guide has, in any plane perpendicular to the optical axis of the optical projection device, a section of polygonal shape, generally rectangular or trapezoidal, with two horizontal sides and two vertical or oblique sides.

Cette forme de section des guides de lumière est propice au guidage de la lumière et est également simplement réalisable.This cross-sectional shape of the light guides is conducive to guiding the light and is also simply achievable.

De préférence, chaque guide associé à une source de lumière est délimité par deux lignes de contour dit d'extrémité, de préférence deux segments de droite, imposant la forme de deux extrémités longitudinales de la bande lumineuse générée par la source de lumière associée au guide, ces deux lignes de contour d'extrémité étant situées à distance d'une surface focale du dispositif optique de projection.Preferably, each guide associated with a light source is delimited by two said end contour lines, preferably two straight segments, imposing the shape of two longitudinal ends of the light strip generated by the light source associated with the guide, these two end contour lines being located at a distance from a focal surface of the optical projection device.

Ainsi, les deux extrémités longitudinales de chaque bande lumineuse générée par le système d'éclairage sont floues. De la sorte, le gradient d'intensité lumineuse dans ces zones est faible, et la transition entre les zones éclairées et les zones non éclairées est douce.Thus, the two longitudinal ends of each light strip generated by the lighting system are blurred. In this way, the gradient of light intensity in these areas is low, and the transition between the illuminated areas and the unlit areas is smooth.

Avantageusement, chaque guide associé à une source de lumière est délimité par deux lignes de contour dit latéral, de préférence deux segments de droite, imposant la forme de deux bords latéraux de la bande lumineuse générée par la source de lumière associée au guide, ces deux lignes de contour latéral étant sensiblement incluses dans le plan focal du dispositif optique de projection.Advantageously, each guide associated with a light source is delimited by two so-called lateral contour lines, preferably two straight segments, imposing the shape of two lateral edges of the light strip generated by the light source associated with the guide, these two lateral contour lines being substantially included in the focal plane of the optical projection device.

Ainsi, les bandes lumineuses générées par le système d'éclairage présentent des bords latéraux nets. De la sorte, on évite que les bandes lumineuses se recouvrent, ce qui pourrait nuire au fonctionnement du système d'éclairage.Thus, the light strips generated by the lighting system have sharp side edges. This prevents the light bands from overlapping, which could adversely affect the operation of the lighting system.

L'invention sera mieux comprise à la lecture de la description qui va suivre donnée uniquement à titre d'exemple et faite en référence aux dessins dans lesquels :

  • la figure 1 est une vue schématique et de dessus d'un système d'éclairage selon un premier mode de réalisation de l'invention dans un repère orthogonal XYZ, dans lequel les directions X et Y sont respectivement les directions horizontales parallèle et perpendiculaire à la direction de déplacement du véhicule dans lequel est monté le système d'éclairage, et la direction Z est la direction verticale,
  • la figure 2 est une vue en section selon le plan XY d'un module d'éclairage du système d'éclairage de la figure 1,
  • la figure 3 est une vue en perspective du module d'éclairage de la figure 2,
  • la figure 4 est une vue en section selon le plan XY des guides de lumière du module d'éclairage de la figure 2, à une plus grande échelle que celle de la figure 2,
  • la figure 5 est une vue éclatée des pièces de guidage d'un module d'éclairage selon un deuxième mode de réalisation de l'invention,
  • la figure 6 est une vue en perspective des pièces de guidage de la figure 5, après assemblage,
  • la figure 7 illustre les taches lumineuses formées par le système d'éclairage du deuxième mode de réalisation de l'invention devant le véhicule,
  • la figure 8 est une vue en section dans le plan XY des pièces de guidage de la figure 6, et
  • les figures 9 et 10 illustrent respectivement des vues en section selon les lignes IX-IX et X-X des pièces de guidage de la figure 8.
The invention will be better understood on reading the description which will follow, given solely by way of example and made with reference to the drawings in which:
  • the figure 1 is a schematic top view of a lighting system according to a first embodiment of the invention in an orthogonal reference frame XYZ, in which the directions X and Y are respectively the horizontal directions parallel and perpendicular to the direction of displacement of the vehicle in which the lighting system is mounted, and the Z direction is the vertical direction,
  • the figure 2 is a sectional view along the XY plane of a lighting module of the lighting system of the figure 1 ,
  • the figure 3 is a perspective view of the lighting module of the figure 2 ,
  • the figure 4 is a sectional view along the XY plane of the light guides of the lighting module of the figure 2 , on a larger scale than that of the figure 2 ,
  • the figure 5 is an exploded view of the guide parts of a lighting module according to a second embodiment of the invention,
  • the figure 6 is a perspective view of the guide parts of the figure 5 , after assembly,
  • the figure 7 illustrates the light spots formed by the lighting system of the second embodiment of the invention in front of the vehicle,
  • the figure 8 is a sectional view in the XY plane of the guide parts of the figure 6 , and
  • the figures 9 and 10 respectively illustrate sectional views along lines IX-IX and XX of the guide parts of the figure 8 .

On a illustré en figure 1 un système d'éclairage 1 pour un projecteur de véhicule automobile selon un premier mode de réalisation de l'invention. Ce système d'éclairage 1 comprend un module d'éclairage 2. Ce module d'éclairage 2 comprend un ensemble 4 de sources de lumière 6, et des moyens de guidage 8 de la lumière émise par les sources de lumière 6. Les moyens de guidage 8 guident la lumière vers un dispositif optique de projection 10 destiné à projeter la lumière qui est émise par les sources de lumière 6 et qui est guidée par les moyens de guidage 8 à l'extérieur du système d'éclairage 1, vers l'avant du véhicule. Le dispositif optique de projection 10 est ici formé par une lentille de projection en forme générale d'hémisphère. La lentille présente une surface libre 12 ayant la forme d'un disque. La lentille présente un axe optique 10A sensiblement parallèle à la direction X et une surface focale 10P ici plane, la surface libre 12 de la lentille étant située à distance de la surface focale 10P. Optionnellement, un dispositif optique de projection complémentaire 14 tel qu'une lentille de projection peut être placé devant le dispositif optique de projection 10 en considérant la trajectoire de la lumière émise par les sources de lumière 6.We illustrated in figure 1 a lighting system 1 for a motor vehicle headlight according to a first embodiment of the invention. This lighting system 1 comprises a lighting module 2. This lighting module 2 comprises a set 4 of light sources 6, and means 8 for guiding the light emitted by the light sources 6. The means of guide 8 guide the light towards an optical projection device 10 intended to project the light which is emitted by the light sources 6 and which is guided by the guide means 8 outside the lighting system 1, towards the front of the vehicle. The optical projection device 10 is here formed by a projection lens in the general shape of a hemisphere. The lens has a free surface 12 in the form of a disc. The lens has an optical axis 10A substantially parallel to the X direction and a focal surface 10P here plane, the free surface 12 of the lens being located at a distance from the focal surface 10P. Optionally, a complementary optical projection device 14 such as a projection lens can be placed in front of the optical projection device 10 by considering the trajectory of the light emitted by the light sources 6.

On va maintenant décrire plus en détails les éléments compris dans le système d'éclairage 1 en référence aux figures 2 à 4.The elements included in the lighting system 1 will now be described in more detail with reference to the figures 2 to 4 .

Les sources de lumière 6 comprennent chacune une diode électroluminescente éventuellement du type diode laser, émettant de la lumière sensiblement monochromatique. Chaque diode laser est couplée à des moyens de conversion de longueur d'onde destinés à transformer la lumière sensiblement monochromatique en lumière blanche. Ces moyens de conversion de longueur d'onde sont par exemple constitués par un bloc, en forme de parallélépipède rectangle, en matériau convertisseur de longueur d'onde, par exemple un matériau phosphorescent ou luminescent, tel que des cristaux YAG (Yttrium Aluminium Garnet) dopés aux terres rares, du sulfure de zinc (ZnS), etc. La lumière blanche est émise par les moyens de conversion de longueur d'onde depuis une surface de ces moyens. En d'autres termes, les sources de lumière 6 comportent chacune une face de forme générale rectangulaire d'émission de lumière. Ces faces d'émission de lumière sont sensiblement centrées sur une même droite définissant une direction d'alignement 16 des sources de lumière 6 sensiblement parallèle à deux côtés opposés de chaque face d'émission de lumière. La direction d'alignement 16 est sensiblement parallèle à la direction Y.The light sources 6 each comprise a light emitting diode optionally of the laser diode type, emitting substantially monochromatic light. Each laser diode is coupled to wavelength converting means for converting substantially monochromatic light to white light. These wavelength conversion means are for example constituted by a block, in the form of a rectangular parallelepiped, of wavelength converter material, for example a phosphorescent or luminescent material, such as YAG crystals (Yttrium Aluminum Garnet). doped with rare earths, zinc sulphide (ZnS), etc. White light is emitted by the wavelength converting means from a surface of these means. In other words, the light sources 6 each have a generally rectangular light emitting face. These light emitting faces are substantially centered on the same straight line defining a direction of alignment 16 of the light sources 6 substantially parallel to two opposite sides of each light emitting face. The alignment direction 16 is substantially parallel to the Y direction.

Le nombre de sources de lumière 6 est de préférence supérieur ou égal à trois et le plus élevé possible, chaque source 6 produisant une des taches lumineuses formant l'éclairage. En variante, on pourra prévoir de remplacer les diodes par des sources de lumière blanche d'un autre type, auquel cas on se dispensera de moyens de conversion de longueur d'onde.The number of light sources 6 is preferably greater than or equal to three and the highest possible, each source 6 producing one of the light spots forming lighting. As a variant, provision could be made to replace the diodes with white light sources of another type, in which case wavelength conversion means will be dispensed with.

Les moyens de guidage de la lumière 8 sont placés en regard des faces d'émission de lumière des sources de lumière 6. Ils sont destinés à guider la lumière émise par chaque source de lumière 6 vers le dispositif optique de projection 10. Les moyens de guidage de lumière 8 comprennent des guides de lumière 18 en nombre égal au nombre de sources de lumière 6. Chaque guide de lumière 18 est couplé avec une source de lumière 6, et réciproquement chaque source de lumière 6 est couplée avec un guide de lumière 18. Les guides de lumière 18 sont agencés de manière à former, à partir de la lumière émise par les sources de lumière 6 et en coopération avec le dispositif optique de projection 10, une tache lumineuse par source de lumière 6, chaque tache lumineuse ayant une forme de bande lumineuse. On verra dans la suite de quelle manière ces taches lumineuses sont engendrées.The light guide means 8 are placed opposite the light emitting faces of the light sources 6. They are intended to guide the light emitted by each light source 6 towards the optical projection device 10. The means of light guide 8 comprise light guides 18 in number equal to the number of light sources 6. Each light guide 18 is coupled with a light source 6, and conversely each light source 6 is coupled with a light guide 18 The light guides 18 are arranged so as to form, from the light emitted by the light sources 6 and in cooperation with the projection optical device 10, one light spot per light source 6, each light spot having a light strip shape. We will see below how these light spots are generated.

Les guides de lumière 18 sont répartis sur des première 20 et seconde 22 pièces de guidage distinctes de formes complémentaires, emboîtées l'une dans l'autre comme cela ressort de la figure 2. En section dans un plan parallèle au plan défini par la droite définissant la direction d'alignement 16 et l'axe optique 10A du dispositif optique de projection 10, chaque pièce de guidage 20, 22 a une forme générale de peigne comportant des dents formant les guides de lumière 18, et des creux alternant avec les dents. De la sorte, les dents de la première pièce de guidage 20 sont aptes à pénétrer dans les creux de la seconde pièce de guidage 22, et inversement, les dents de la seconde pièce de guidage 22 sont aptes à pénétrer dans les creux de la première pièce de guidage 20. Les pièces de guidage 20, 22 s'emboîtent ainsi efficacement l'une dans l'autre en minimisant les volumes d'air entre les pièces de guidage 20, 22.The light guides 18 are distributed over first 20 and second 22 distinct guide pieces of complementary shapes, nested one inside the other as emerges from the figure 2 . In section in a plane parallel to the plane defined by the straight line defining the direction of alignment 16 and the optical axis 10A of the projection optical device 10, each guide piece 20, 22 has the general shape of a comb comprising teeth forming the light guides 18, and recesses alternating with the teeth. In this way, the teeth of the first guide piece 20 are able to penetrate into the recesses of the second guide piece 22, and conversely, the teeth of the second guide piece 22 are able to penetrate into the recesses of the first guide piece 20. The guide pieces 20, 22 thus fit together effectively while minimizing the air volumes between the guide pieces 20, 22.

Les deux pièces de guidage 20, 22 sont réalisées dans un même matériau, tel que du silicone ou du polycarbonate. Ces deux pièces de guidages 20, 22 sont par exemple fixées l'une à l'autre au moyen d'une colle présentant un indice optique proche de celui du matériau dans lequel sont réalisées les pièces de guidage. On s'assure ainsi que les éventuelles poches d'air situées entre les deux pièces de guidage 20, 22 sont remplies par cette colle. Etant donné qu'elle présente un indice optique proche de celui du matériau des pièces de guidage 20, 22, par exemple égal à plus ou moins 0,1, la colle ne dévie que très peu la lumière se propageant dans les moyens de guidage 8 par rapport à la trajectoire souhaitée. On peut également prévoir de ne pas avoir à recourir à une colle et d'utiliser tout autre moyen de fixation connu de l'homme du métier. Ces moyens de fixation peuvent notamment s'étendre sur des surfaces latérales des pièces de guidage 20, 22, c'est-à-dire celles s'étendant sensiblement perpendiculairement à la direction verticale Z. En effet, dans cette position, les moyens de fixation ne gêneraient pas la propagation de la lumière dans le système d'éclairage 1.The two guide pieces 20, 22 are made of the same material, such as silicone or polycarbonate. These two guide pieces 20, 22 are for example fixed to one another by means of an adhesive having an optical index close to that of the material in which the guide pieces are made. This ensures that any air pockets located between the two guide pieces 20, 22 are filled with this adhesive. Given that it has an optical index close to that of the material of the guide pieces 20, 22, for example equal to plus or minus 0.1, the glue only slightly deflects the light propagating in the guide means 8 relative to the desired trajectory. It is also possible to provide for not having to resort to an adhesive and to use any other fixing means known to those skilled in the art. These fixing means may in particular extend over the side surfaces of the guide pieces 20, 22, that is to say those extending substantially perpendicular to the vertical direction Z. In fact, in this position, the fixing means would not hinder the propagation of light in the lighting system 1.

Les guides de lumière 18 sont répartis sur les première 20 et seconde 22 pièces de guidage de façon qu'en considérant la direction d'alignement 16 des sources de lumière 6, les guides de lumière 18 portés par la première pièce de guidage 20 alternent avec les guides de lumière 18 portés par la seconde pièce de guidage 22. Un tel agencement permet d'augmenter les surfaces de contact entre les deux pièces de guidage 20, 22 et donc d'améliorer la fixation des pièces de guidage 20, 22 l'une avec l'autre.The light guides 18 are distributed over the first 20 and second 22 guide pieces so that, considering the direction of alignment 16 of the light sources 6, the light guides 18 carried by the first guide piece 20 alternate with the light guides 18 carried by the second guide piece 22. Such an arrangement makes it possible to increase the contact surfaces between the two guide pieces 20, 22 and therefore to improve the fixing of the guide pieces 20, 22 the one with the other.

La première pièce de guidage 20 est placée en regard des faces d'émission de lumière. Une surface libre de la première pièce de guidage 20 présente des reliefs de rabattement des faisceaux lumineux 24 destinés à focaliser les rayons lumineux émis par chaque source de lumière 6 vers le guide de lumière 18 avec lequel elle est couplée. Ces reliefs de rabattement 24 forment des surfaces d'entrée de la lumière dans les guides de lumière 18. Ces reliefs de rabattement 24 forment des dioptres convergeant et sont aptes à focaliser la lumière émise par chaque source de lumière 6 vers l'intérieur du guide de lumière 18 avec lequel la source 6 est couplée. Il s'en suit qu'on augmente la quantité de lumière qui pénètre à l'intérieur des guides de lumière 18 pour augmenter l'intensité lumineuse du faisceau sortant du système d'éclairage 1 et qu'on évite autant que faire se peut d'injecter de la lumière d'une source de lumière 6 vers les guides de lumière 18 adjacents à celui qui lui est apparié. Les faisceaux F représentés sur la figure 2 illustrent les effets des reliefs de rabattement 24.The first guide piece 20 is placed opposite the light emitting faces. A free surface of the first guide piece 20 has reliefs for folding down the light beams 24 intended to focus the light rays emitted by each light source 6 towards the light guide 18 with which it is coupled. These folding reliefs 24 form light entry surfaces in the light guides 18. These folding reliefs 24 form converging diopters and are able to focus the light emitted by each light source 6 towards the interior of the guide. light 18 with which the source 6 is coupled. It follows that one increases the quantity of light which penetrates inside the light guides 18 in order to increase the light intensity of the beam exiting the lighting system 1 and that one avoids as much as possible d 'injecting light from a light source 6 to the light guides 18 adjacent to the one paired with it. The F beams shown on the figure 2 illustrate the effects of folding reliefs 24.

La seconde pièce de guidage 22 est rapportée sur la surface libre 12 du dispositif optique de projection 10. Dans le cas présent, la deuxième pièce de guidage 22 est surmoulée sur la surface libre 12 du dispositif optique de projection 10. Grâce au surmoulage, il n'est pas nécessaire de prévoir de moyens de fixation spécifiquement dédiés à la fixation de la seconde pièce de guidage 22 sur la surface libre 12. On pourra néanmoins prévoir de fixer la deuxième pièce de guidage 22 sur la surface libre 12 par tout autre moyen. On peut également prévoir que la seconde pièce de guidage 22 soit venue de matière avec la lentille de projection.The second guide piece 22 is attached to the free surface 12 of the optical projection device 10. In the present case, the second guide piece 22 is overmolded on the free surface 12 of the optical projection device 10. Thanks to the overmolding, it It is not necessary to provide fixing means specifically dedicated to fixing the second guide piece 22 on the free surface 12. It is nevertheless possible to provide for fixing the second guide piece 22 on the free surface 12 by any other means. . Provision can also be made for the second guide piece 22 to be integral with the projection lens.

On va maintenant décrire un exemple possible de la manière dont les pièces de guidages 20, 22 peuvent être fabriquées et installées dans le système d'éclairage 1.We will now describe a possible example of how the guide parts 20, 22 can be manufactured and installed in the lighting system 1.

Dans un premier temps, on surmoule la deuxième pièce de guidage 22 sur la surface libre 12 du dispositif optique de projection 10 de manière connue en soi. Pour faciliter le démoulage de la deuxième pièce de guidage 22 qui s'effectue parallèlement à la direction X, on moule les dents de la deuxième pièce de guidage 22 légèrement en dépouille.First, the second guide piece 22 is overmolded on the free surface 12 of the optical projection device 10 in a manner known per se. To facilitate demolding of the second guide piece 22 which takes place parallel to the X direction, the teeth of the second guide piece 22 are molded slightly undercut.

Dans un second temps, on forme la première pièce de guidage 20, par exemple par moulage en donnant aux dents de cette première pièce de guidage 20 des formes en contre-dépouille. En effet, en se référant à la figure 4, on voit que toutes les dents de la première pièce de guidage 20 sont moulées en contre-dépouille. On modifie de la sorte la forme des guides de lumière 18 et donc celles de taches lumineuses générées par le système d'éclairage 1. Ces contre-dépouilles sont permises par l'axe de démoulage de la pièce de guidage 20, perpendiculaire au plan de la figure 4.Secondly, the first guide part 20 is formed, for example by molding, giving the teeth of this first guide part 20 undercut shapes. Indeed, referring to the figure 4 , it can be seen that all the teeth of the first guide piece 20 are molded against the undercut. The shape of the light guides 18 and therefore those of the light spots generated by the lighting system 1 is modified in this way. These undercuts are permitted by the release axis of the guide piece 20, perpendicular to the plane of the figure 4 .

L'emboitement de la première pièce de guidage 20 dans la seconde pièce de guidage 22 s'effectue par translation parallèlement à la direction Z.The engagement of the first guide part 20 in the second guide part 22 is effected by translation parallel to the Z direction.

Le moulage en contre-dépouille de la première pièce de guidage 20 permet de ménager une lame d'air 25 entre chaque guide de lumière 18, ces lames d'air 25 étant destinées à séparer les guides de lumière 18. Chaque lame d'air 25 présente une épaisseur de l'ordre de quelques dizaines de micromètres en moyenne. La forme en contre-dépouille de la première pièce de guidage 20 permet également aux guides de lumière 18 de mieux guider la lumière car une telle forme réduit l'angle maximal selon lequel un rayon lumineux se propageant dans un guide 18 peut rencontrer une paroi latérale dudit guide 18, c'est-à-dire une paroi de normale sensiblement incluse dans un plan horizontal.The undercut molding of the first guide piece 20 makes it possible to provide an air space 25 between each light guide 18, these air spaces 25 being intended to separate the light guides 18. Each air space 25 has a thickness of the order of a few tens of micrometers on average. The undercut shape of the first guide piece 20 also allows the light guides 18 to better guide light because such a shape reduces the maximum angle at which a light ray propagating in a guide 18 can meet a side wall. of said guide 18, that is to say a normal wall substantially included in a horizontal plane.

Les opérations de moulage décrites ci-dessus permettent aux pièces de guidage 20, 22 de présenter un jeu l'une par rapport à l'autre quasiment nul, en général de l'ordre de 200 µm ou moins, selon les tolérances d'usinage appliquées. De préférence, on ajoute de la colle dans les creux de la seconde pièce de guidage 22 avant d'y emboiter la première pièce de guidage 20 pour éviter la présence de poches d'air indésirables entre les deux pièces de guidage 20, 22.The molding operations described above allow the guide pieces 20, 22 to have almost zero play relative to each other, generally of the order of 200 μm or less, depending on the machining tolerances. applied. Preferably, glue is added to the recesses of the second guide piece 22 before fitting the first guide piece 20 therein to avoid the presence of undesirable air pockets between the two guide pieces 20, 22.

On va maintenant décrire de quelle manière fonctionne le système d'éclairage 1. Comme cela a été décrit précédemment, les sources de lumière 6 émettent de la lumière blanche en direction des guides de lumière 18. Ceux-ci guident alors la lumière jusqu'au dispositif optique de projection 10 qui projette la lumière hors du système d'éclairage 1, vers l'avant du véhicule. Comme cela ressort notamment de la figure 3, chaque guide de lumière 18 présente, dans tout plan perpendiculaire à l'axe optique 10A du dispositif de projection 10, une section de forme générale rectangulaire à deux côtés horizontaux et deux côtés verticaux. De la sorte, les taches lumineuses générées par le système d'éclairage 1 ont chacune globalement la forme d'un rectangle, bien que le moulage en contre-dépouille de la première pièce de guidage 20 procure à chaque tache lumineuse une forme sensiblement trapézoïdale.We will now describe how the lighting system 1 operates. As has been described previously, the light sources 6 emit white light in the direction of the light guides 18. These then guide the light to the light guide. optical projection device 10 which projects the light out of the lighting system 1, towards the front of the vehicle. As emerges in particular from the figure 3 , each light guide 18 has, in any plane perpendicular to the optical axis 10A of the projection device 10, a generally rectangular section with two horizontal sides and two vertical sides. In this way, the light spots generated by the lighting system 1 each have the overall shape of a rectangle, although the undercut molding of the first guide piece 20 gives each light spot a substantially trapezoidal shape.

On a représenté en figures 5 et 6 les pièces de guidage 20, 22 d'un module d'éclairage selon un deuxième mode de réalisation de l'invention. Ce deuxième mode de réalisation diffère du premier mode en ce que chaque guide 18 associé à une source de lumière 6 est délimité par deux lignes de contour dit d'extrémité, ici deux segments de droite, imposant la forme de deux extrémités longitudinales de la bande lumineuse générée par la source de lumière 6 associée au guide 18, ces deux lignes de contour d'extrémité étant situées à distance du plan focal 10P du dispositif optique de projection 10.We have represented in figures 5 and 6 the guide pieces 20, 22 of a lighting module according to a second embodiment of the invention. This second mode This embodiment differs from the first embodiment in that each guide 18 associated with a light source 6 is delimited by two so-called end contour lines, here two straight segments, imposing the shape of two longitudinal ends of the light strip generated by the light source 6 associated with the guide 18, these two end contour lines being located at a distance from the focal plane 10P of the optical projection device 10.

Ce deuxième mode de réalisation diffère également du premier mode en ce que chaque guide 18 associé à une source de lumière 6 est délimité par deux lignes de contour dit latéral, de préférence deux segments de droite, imposant la forme de deux bords latéraux de la bande lumineuse 26 générée par la source de lumière 6 associée au guide 18, ces deux lignes de contour latéral étant sensiblement incluses dans la surface focale 10P du dispositif optique de projection 10.This second embodiment also differs from the first embodiment in that each guide 18 associated with a light source 6 is delimited by two so-called lateral contour lines, preferably two straight segments, imposing the shape of two lateral edges of the strip. light 26 generated by the light source 6 associated with the guide 18, these two lateral contour lines being substantially included in the focal surface 10P of the optical projection device 10.

La figure 7 illustre les taches lumineuses 26 engendrées par le système d'éclairage 1 selon le deuxième mode de réalisation de l'invention. Chaque tache lumineuse 26 a une forme générale de bande lumineuse sensiblement rectangulaire et allongée selon la direction verticale Z. Chaque tache lumineuse 26 présente des bords latéraux légèrement inclinés par rapport à la direction verticale Z, d'un angle environ égal à quelques degrés. Cette inclinaison est causée par le moulage en contre-dépouille de la première pièce de guidage 20 et par le moulage en contre-dépouille de la seconde pièce de guidage 22. Ces propriétés des taches lumineuses 26 sont également obtenues pour un système d'éclairage 1 selon le premier mode de réalisation de l'invention.The figure 7 illustrates the light spots 26 generated by the lighting system 1 according to the second embodiment of the invention. Each light spot 26 has the general shape of a light strip that is substantially rectangular and elongated in the vertical direction Z. Each light spot 26 has side edges that are slightly inclined with respect to the vertical direction Z, at an angle approximately equal to a few degrees. This inclination is caused by the undercut molding of the first guide piece 20 and by the undercut molding of the second guide piece 22. These properties of the light spots 26 are also obtained for a lighting system 1. according to the first embodiment of the invention.

Les bords latéraux de chaque bande 26 sont nets alors que les bords d'extrémité de chaque bande 26 sont flous. De la sorte, les bandes lumineuses 26 sont nettement démarquées les unes par rapport aux autres afin qu'elles ne se chevauchent pas, et les transitions en intensité lumineuses aux extrémités hautes et basses des bandes lumineuses 26 sont douces, ce qui améliore le confort de vue du conducteur du véhicule. Dans la présente invention, on détermine le degré de netteté d'une coupure ou du bord d'une bande lumineuse par mesure du contraste G au niveau de la ligne de coupure, selon le mode de mesure règlementaire de la netteté des coupures des faisceaux d'éclairage à coupure des véhicules automobiles. Ainsi, on place un écran de mesure à 25 m du système d'éclairage et on relève la valeur d'éclairement Eβ (en lux) à un angle β donné d'un coté de la coupure et la valeur d'éclairement E β+0,1° à un angle β+0,1°, situé de l'autre coté de la coupure. Le contraste G est égal à log Eβ - log E β+0,1°. Si G est supérieur à 0,13 alors la coupure est nette.The side edges of each strip 26 are sharp while the end edges of each strip 26 are blurred. In this way, the light bands 26 are clearly demarcated from one another so that they do not overlap, and the light intensity transitions at the high and low ends of the light bands 26 are smooth, which improves the comfort of the light. view of the driver of the vehicle. In the present invention, the degree of sharpness of a cut-off or of the edge of a light strip is determined by measuring the contrast G at the cut-off line, according to the regulatory method of measuring the sharpness of the cut-offs of the beams d. switching off lighting for motor vehicles. Thus, a measuring screen is placed 25 m from the lighting system and the illumination value E β (in lux) at an angle β given on one side of the cut-off and the illumination value E β is noted. +0.1 ° at an angle β + 0.1 °, located on the other side of the cutoff. The contrast G is equal to log E β - log E β + 0.1 °. If G is greater than 0.13 then the cutoff is clear.

Le fait que les deux lignes de contour latéral soient sensiblement incluses dans la surface focale 10P est la raison pour laquelle les extrémités latérales de chaque bande lumineuse 26 sont nettes. Les deux lignes de contour latéral sont sensiblement incluses dans les droites représentées par les traits 30 et 30'. Chaque guide de lumière 18 présente de telles droites. Elles sont également visibles sur les figures 7 à 9.The fact that the two side contour lines are substantially included in the focal surface 10P is the reason why the side ends of each light strip 26 are sharp. The two lateral contour lines are substantially included in the straight lines represented by the lines 30 and 30 '. Each light guide 18 has such straight lines. They are also visible on the figures 7 to 9 .

Le fait que les deux lignes de contour d'extrémité soient placées à distance du plan focal 10P est la raison pour laquelle les extrémités hautes et basses des bandes lumineuses 26 sont floues. Les deux lignes de contour d'extrémité sont sensiblement incluses dans les droites représentées par les traits discontinus 28 et 28'. Ces deux droites sont communes à tous les guides de lumière 18. Ces deux droites sont également visibles sur les figures 7 à 9.The fact that the two end contour lines are placed away from the focal plane 10P is the reason why the high and low ends of the light bands 26 are blurred. The two end contour lines are substantially included in the straight lines represented by the broken lines 28 and 28 '. These two lines are common to all the light guides 18. These two lines are also visible on the figures 7 to 9 .

Bien entendu, on pourra apporter à l'invention de nombreuses modifications sans sortir du cadre de celle-ci.Of course, numerous modifications can be made to the invention without departing from the scope thereof.

On pourra équiper le système d'éclairage de plusieurs modules d'éclairage tels que celui décrit dans ce qui précède, par exemple pour générer un nombre plus important de bandes lumineuses ou bien pour combler les zones sombres situées entre les bandes lumineuses générées par un module d'éclairage.The lighting system can be fitted with several lighting modules such as that described in the foregoing, for example to generate a larger number of light bands or else to fill in the dark areas located between the light bands generated by a module. lighting.

On pourra prévoir de centrer les faces d'émission de lumière des sources sur une ligne qui soit une courbe plane située dans un plan perpendiculaire à la direction verticale Z, et non pas sur une ligne droite. Dans ce cas, les guides de lumière devront présenter des longueurs différentes de sorte que les surfaces d'entrée de lumière des guides de lumière soient centrées sur une courbe plane située dans un plan perpendiculaire à la direction verticale Z et de sorte que la face d'émission de lumière de chaque source de lumière soit située à une même distance du guide de lumière auquel elle est associée. On optimise de la sorte la forme du dispositif optique de projection.Provision may be made to center the light emitting faces of the sources on a line which is a plane curve situated in a plane perpendicular to the vertical direction Z, and not on a straight line. In this case, the light guides should have different lengths so that the light entry surfaces of the light guides are centered on a planar curve located in a plane perpendicular to the vertical direction Z and so that the face d the light emission of each light source is located at the same distance from the light guide to which it is associated. In this way, the shape of the optical projection device is optimized.

Claims (10)

  1. Motor-vehicle lighting system (1) comprising at least one lighting module (2), comprising:
    - light sources (6) each comprising a light-emitting face of rectangular general shape, the light-emitting faces being substantially centred on the same straight line defining a direction of alignment (16) of the light sources (6) that is substantially parallel to two opposite sides of each light-emitting face, and
    - a projecting optical device (10),
    characterized in that the lighting module (2) further comprises light guides (18), each light guide (18) being coupled to one of the light sources (6),
    the light guides (18) being distributed between separate first and second guiding parts (20, 22) of complementary shapes that are interlocked with each other,
    the first guiding part (20) being placed facing the light-emitting faces,
    the second guiding part (22) being joined to a free surface (12) of the projecting optical device (10),
    the light guides (18) being arranged so as to form, from the light emitted by the light sources (6) and via interaction with the projecting optical device (10), one light spot (26) per light source, each light spot (26) taking the form of a luminous strip.
  2. Lighting system (1) according to Claim 1, wherein the light guides (18) are distributed between the first and second guiding parts (20, 22) so that, considering the direction of alignment (16) of the light sources (6), the light guides (18) borne by the first guiding part (20) alternate with the light guides (18) borne by the second guiding part (22).
  3. Lighting system (1) according to any one of the preceding claims, wherein, in cross section in a plane parallel to the plane defined by the straight line defining the direction of alignment (16) and an optical axis (10A) of the projecting optical device (10), each guiding part (20, 22) has the general shape of a comb comprising teeth forming the light guides (18), and recesses alternating with the teeth.
  4. Lighting system (1) according to any one of the preceding claims, wherein a free surface of the first guiding part (20) comprises reliefs for steering the light beams (24), which are intended to focus the light rays emitted by each light source (6) toward the light guide (18) to which said source is coupled.
  5. Lighting system (1) according to any one of the preceding claims, wherein the guiding parts (20, 22) are made from the same material, a material such as silicone, these two guiding parts (20, 22) being fastened to each other by means of an adhesive having a refractive index close to that of the material from which the guiding parts (20, 22) are made.
  6. Lighting system (1) according to any one of the preceding claims, wherein the second guiding part (22) is over-moulded on the free surface (12) of the projecting optical device (10).
  7. Lighting system (1) according to any one of the preceding claims, wherein two adjacent light guides (18) are separated by an air-filled space (25).
  8. Lighting system (1) according to any one of the preceding claims, wherein each light guide (18) has, in any plane perpendicular to the optical axis (10A) of the projecting optical device (10), a cross section of generally rectangular shape with two sides horizontal and two sides vertical.
  9. Lighting system (1) according to Claim 8, wherein each guide (18) associated with one light source (6) is bounded by two boundary lines referred to as end boundary lines, and preferably by two straight line segments (28, 28'), delineating the shape of two longitudinal ends of the luminous strip (26) generated by the light source (6) associated with the guide (18), these two boundary lines being located away from a focal plane (10P) of the projecting optical device (10).
  10. Lighting system (1) according to Claim 8 or 9, wherein each guide (18) associated with one light source (6) is bounded by two boundary lines referred to as lateral boundary lines, and preferably two straight line segments (30, 30'), delineating the shape of two lateral edges of the luminous strip (26) generated by the light source (6) associated with the guide (18), these two lateral boundary lines being substantially included in the focal plane (10P) of the projecting optical device (10) .
EP16181946.1A 2015-08-07 2016-07-29 Lighting system for motor vehicle headlight comprising a compact lighting module Active EP3128225B1 (en)

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FR1557605A FR3039884B1 (en) 2015-08-07 2015-08-07 LIGHTING SYSTEM FOR MOTOR VEHICLE PROJECTOR COMPRISING A LOW-DIMENSIONAL LIGHTING MODULE

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DE102019131685A1 (en) * 2019-11-22 2021-05-27 Automotive Lighting Reutlingen Gmbh Light module, light guide arrangement, lighting device and motor vehicle
DE102020115242A1 (en) * 2020-06-09 2021-12-09 Marelli Automotive Lighting Reutlingen (Germany) GmbH Ancillary optics assembly for a partial high beam module for a motor vehicle headlight

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DE102011053232B4 (en) 2011-09-02 2020-08-06 Leica Microsystems Cms Gmbh Microscopic device and microscopic method for the three-dimensional localization of punctiform objects
DE102013013456B4 (en) * 2012-10-14 2023-03-30 Docter Optics Se Optical element for a vehicle headlight
FR2999679B1 (en) * 2012-12-14 2015-01-16 Valeo Vision PRIMARY OPTICAL ELEMENT, LIGHTING MODULE AND PROJECTOR FOR MOTOR VEHICLE.
DE102014007185B4 (en) * 2013-06-18 2016-02-04 Docter Optics Se Optical element for a vehicle headlight
AT514705B1 (en) * 2013-10-28 2015-03-15 Zizala Lichtsysteme Gmbh Mounting device for an optical body for a motor vehicle headlight
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