EP3147557B1 - Primary optical element for lighting module of a vehicle - Google Patents

Description

The invention relates to the field of lighting and / or signaling, in particular for motor vehicles. It relates more particularly to a projector light module and an associated primary optical element in this module.

A motor vehicle is equipped with projectors, or headlights, intended to illuminate the road in front of the vehicle, at night or in the event of reduced brightness, by a global light beam. These projectors, a left projector and a right projector, include one or more light modules adapted to generate and direct an intermediate light beam, the addition of which forms said overall light beam.

These headlamps can generally be used in two lighting modes: a first "high beam" mode producing a high beam and a second "low beam" mode producing a Code beam. The "high beam" mode allows the road to be strongly illuminated far in front of the vehicle. The "low beam" mode provides more limited illumination of the road, but nevertheless offers good visibility, without dazzling other road users. The two lighting modes, "high beam" and "low beam", are complementary, and we switch from one to the other depending on the traffic conditions. It is known practice to produce the main beam beam by adding the Code beam and a complementary beam, joined with the Code beam at the cut-off edge. The Code beam is generated by the sole switching on of means specific to the second “low beam” mode, while the High beam is generated by the simultaneous switching on of the means specific to the second “low beam” mode and means specific to the first mode " Redlights ".

There is now a need, in the automotive field, to be able to illuminate the road in front of you in "partial road lighting mode", namely to generate in a "high beam" beam one or more dark areas corresponding to the places where there are present oncoming vehicles or vehicles driving ahead, so as to avoid dazzling the drivers of these vehicles while illuminating the road in its largest area. Such a function is called ADB (Adaptive Driving Beam) or even “selective beam”. Such an ADB function consists on the one hand in automatically detecting a road user liable to be dazzled by a light beam emitted in high beam mode by a headlamp, and on the other hand in automatically modifying the contour. of this lighting beam so as to create a shadow zone where the detected user is located, without manual intervention by the driver of the vehicle. The advantages of the ADB function are multiple: ease of use, better visibility compared to lighting in low beam mode, better reliability for changing modes, greatly reduced risk of dazzling, safer driving.

Light modules are known for producing a selective beam in which optical guides are arranged side by side, each being illuminated by a respective light source so that the light beam at the output of the module is cut into contiguous regions that are can turn off or on according to instructions of detecting a nearby vehicle.

The shape and arrangement of the guides with respect to each other in a module of a projector must be very precise in order to be able to produce an intermediate beam at the output of the module which is homogeneous and smooth when all the segments are on, and on the other hand to be able to present an intermediate beam complementary to the intermediate beam produced at the output of the other headlight. In the document FR 2 999 679 , the Applicant has disclosed a single-piece primary optical element capable of being integrated into a light module further comprising a projection system, said primary optical element comprising integrally formed guides with a flat face arranged in a ball, the opposite face of which is substantially spherical, the ball forming in particular a correction portion making it possible to improve the optical efficiency of the system and to correct the aberrations of the light module.

The present invention falls within the context of optimizing these matrix lights as well as in the context of the multiplication of the lighting functions which are used. can offer users, and among which one can for example identify the high-speed lighting function, or highway, (function called "Motorway Light" in English), in which the intensity of the beam is increased around the optical axis of the headlamp to increase the lighting range, or even the rainy weather function (function known as AWL for "Adverse Weather Light" in English), in which the low beam beam is controlled so that the spotlight reflection on the wet road is not dazzling. In addition, it is more and more common to see motor vehicles equipped with a directional lighting function, better known by the English acronym DBL (for Dynamic Bending Light), in which the objective is to dynamically illuminate turns when the vehicle is turning. For this purpose, it is known to mount the light module pivoting around a substantially vertical axis of rotation, and therefore in a bend, the beam projected at the outlet of the headlight is no longer oriented in the longitudinal axis of the vehicle but towards the inside of the turn.

It will be understood that it is interesting that the multiplication of these functions is accompanied by a search to reduce the number of modules in a projector, to optimize the size, and / or a reduction in the number of components in each of them. these modules.

The invention falls within this context and it aims to provide a primary optical element for a motor vehicle lighting module, comprising a light introduction part provided with a plurality of primary optical means connected at the output to a correcting part, said primary optical means being arranged on two levels in a first direction, here a vertical direction, in first and second distinct primary optical means, a plurality of first primary optical means being arranged in series in a second direction, here transverse , substantially perpendicular to the first direction.

Thus, there are two distinct series of primary optical means, which can be implemented with series of light sources independent of each other and which are both connected to a common corrective optical element, which facilitates the projection of light. separate light beams in a single light module. The series are in particular distinct in that the input faces of the first primary optical means have a profile distinct from the profile of the input face of the second primary optical means.

According to the invention, the second primary optical means consists of a strip of material extending continuously in the second direction, overhanging the first primary optical means. By "continuously", it is understood that the entry face of the second primary optical means may have a variable profile from one end transverse to the other of this second primary optical means. It may be noted that the notion of continuity can be explained by the fact that, unlike the first primary optical means, there is a tendency to remain in the material when the second primary optical means is traversed from end to end, transversely. . In other words, if we assimilate the second primary optical means overhanging the first primary optical means in a succession of second primary optical means in a second direction, here transverse, it can be considered that each second primary optical means comprises a junction part with the corrective part and an optical profile installed on the junction part, the junction parts of the second primary optical means forming a common junction part extending continuously in the second direction.

• les moyens optiques primaires présentent une face de sortie reliée à la partie correctrice et une face d'entrée de lumière tournée à l'opposé de cette partie correctrice ;
• l'allumage des deuxièmes sources de lumière primaires crée un faisceau Code et l'allumage de l'ensemble des sources de lumière primaires, les premières comme les deuxièmes, crée un faisceau Route, avec une partie supérieure, susceptible d'éblouir des usagers sur la scène de route, qui est matricielle avec des régions contigües, par exemple des segments, que l'on peut éteindre sélectivement pour éviter cet éblouissement ;
• la face d'entrée du moyen optique primaire présente une pluralité de formes convexes : on pourra notamment définir ces formes convexes par des formes présentant des extrémités latérales jointives des formes convexes voisines et une partie centrale entre ces extrémités latérales qui est bombée, en éloignement de la partie correctrice ;
• les faces de sortie des moyens optiques primaires sont décalées axialement, selon un axe optique sensiblement perpendiculaire aux première et deuxième directions, par rapport aux faces de sortie du deuxième moyen optique primaire ;
• les premiers et deuxième moyens optiques primaires sont disposés de part et d'autre de l'axe optique du module ; on pourra notamment prévoir que la jonction entre ces premier et deuxième moyens passe par cet axe optique ;
• la face de sortie du deuxième moyen optique primaire, par rapport à la partie correctrice, est en retrait axial par rapport aux faces de sortie des premiers moyens optiques primaires.

According to a series of characteristics, which can be taken alone or in combination, specific to the arrangement of the various primary optical means, it is possible to provide that:

• the primary optical means have an exit face connected to the correcting part and a light entry face facing away from this correcting part;
• the switching on of the second primary light sources creates a Code beam and the switching on of all the primary light sources, both the first and the second, creates a road beam, with an upper part, capable of dazzling users on the road scene, which is a matrix with contiguous regions, for example segments, which can be selectively switched off to avoid this glare;
• the input face of the primary optical means has a plurality of convex shapes: it is possible in particular to define these convex shapes by shapes having lateral ends contiguous with neighboring convex shapes and a central part between these lateral ends which is convex, away from the corrective part;
• the output faces of the primary optical means are offset axially, along an optical axis substantially perpendicular to the first and second directions, with respect to the output faces of the second primary optical means;
• the first and second primary optical means are arranged on either side of the optical axis of the module; provision may in particular be made for the junction between these first and second means to pass through this optical axis;
• the exit face of the second primary optical means, relative to the correcting part, is axially set back relative to the exit faces of the first primary optical means.

• la partie correctrice comporte une face de sortie au moins en partie en forme de dôme sensiblement sphérique : on notera que par « dôme sensiblement sphérique », on entend désigner une surface dont la forme épouse au moins partiellement celle d'une sphère, et qu'en d'autres termes, la partie correctrice est délimitée au moins par une face de sortie présentant au moins une portion sphérique ;
• la face de sortie en forme de dôme sensiblement sphérique est centrée sensiblement à la sortie de l'un des premiers moyens optiques primaires ;
• la face de sortie en forme de dôme sensiblement sphérique est centrée sensiblement entre les premiers moyens optiques primaires et le deuxième moyen optique primaire ;
• la face d'entrée de la correctrice peut être plane ou bien s'inscrire dans un profil courbe suivant notamment la surface focale d'un élément optique secondaire ;
• la partie correctrice peut prendre également une forme partielle de boule, et éventuellement une portion de boule tronquée, c'est-à-dire coupée de chaque côté de la portion sphérique formée sur la face de sortie ;

According to another series of characteristics, which can be taken alone or in combination, this time specific to the arrangement of the corrective part, it can be provided that:

• the correcting part comprises an exit face at least partly in the shape of a substantially spherical dome: it will be noted that the term “substantially spherical dome” is understood to denote a surface whose shape at least partially matches that of a sphere, and that in other words, the correcting part is delimited at least by an exit face having at least one spherical portion;
• the substantially spherical dome-shaped exit face is centered substantially at the exit of one of the first primary optical means;
• the substantially spherical dome-shaped exit face is centered substantially between the first primary optical means and the second primary optical means;
• the entry face of the corrector may be flat or else be part of a curved profile following in particular the focal surface of a secondary optical element;
• the correcting part may also take a partial ball shape, and possibly a truncated ball portion, that is to say cut on each side of the spherical portion formed on the exit face;

The corrective part as it has just been presented makes it possible to improve the optical efficiency of the light module and it also makes it possible to correct the field aberrations of the optical system and thus ensure good quality imaging.

The primary optical element according to the invention is advantageously in one piece. At least the first primary optical means and the correcting part form an assembly which cannot be undone without causing degradation of one or the other. Further still, the second primary optical means can form an integral structure with said correcting part and said first primary optical means. To obtain this one-piece arrangement, it is possible to make all of the parts making up this primary optical element in one piece, in particular by molding, or else to add one of these components, for example the secondary optical means. It is notable that, in order to facilitate the transmission of light rays through the introduction part and the correcting part, and not to generate a deviation of the rays when passing one another, the respective refractive indices of the means primary optics and the corrective part may be substantially identical. And in this context and with an additional advantage of making it easier to obtain, in particular by molding, the one-piece structure, the primary optical means and the correcting part can be made from the same material, and they can be made from the same polymer.

• au moins un, notamment chaque, premier moyen optique primaire est destiné à recevoir un premier faisceau de lumière primaire d'une source de lumière disposé en vis-à-vis de sa face d'entrée de lumière et est agencé pour mettre en forme ce premier faisceau de lumière primaire de sorte à ce que la projection de ce premier faisceau de lumière primaire sur la route présente une forme de bande lumineuse verticale présentant un bord inférieur, et présentant notamment des bords verticaux nets ;
• au moins un premier moyen optique primaire comporte une face, supérieure ou inférieure, ayant une forme de portion cylindrique ;
• la face d'entrée d'au moins un moyen optique primaire s'étend au moins partiellement dans un plan incliné par rapport au plan dans lequel s'étend la face arrière de la partie correctrice d'un angle compris entre 0° et 45° ;
• au moins un premier moyen optique primaire comprend au moins une face d'étalement, ladite face d'étalement étant conformée de manière à élargir la section transversale du moyen optique primaire de sa face d'entrée jusqu'à sa sortie ;
• les premiers moyens optiques primaires et les premières sources de lumière primaire associées, et disposées en regard de la face d'entrée, sont configurés pour que les rayons émis par ces sources de lumière pénètrent dans le premier moyen optique primaire correspondant par la face arrière puis se propagent à l'intérieur de ce premier moyen optique primaire vers la face de sortie, éventuellement par des réflexions totales internes successives sur les faces inférieure, supérieure et latérales ;
• la section transversale de chaque premier moyen optique primaire peut avoir une forme généralement de parallélogramme, et plus précisément de rectangle ;
• les premiers moyens optiques primaires sont juxtaposés et forment, disposés à intervalles réguliers, une rangée horizontale de sorte que des sources de lumière secondaires sont virtuellement aménagées en série sur la face arrière de la partie correctrice, sensiblement sur la surface focale objet du système de projection, pour être projetés à l'infini dans cet agencement segmenté ;
• la face supérieure de chacun des premiers moyens optiques primaires peut être une surface courbe ayant globalement une forme de portion cylindrique de génératrice sensiblement ellipsoïdale, ce qui a notamment pour effet de concentrer l'intensité lumineuse dans la partie haute du faisceau sortant du premier moyen optique primaire, ce qui correspond à une zone (dite « zone de portée ») située dans le bas du faisceau matriciel produit en sortie du module lumineux et qui correspond à la zone de coupure à la jonction avec le faisceau Code produit en sortie du module optique par l'interaction des deuxièmes sources de lumière primaires et du deuxième moyen optique primaire associé.

According to characteristics of the invention, taken alone or in combination with one another and with the characteristics mentioned above:

• at least one, in particular each, first primary optical means is intended to receive a first primary light beam from a light source arranged opposite its light input face and is arranged to shape this first primary light beam so that the projection of this first primary light beam on the road has the shape of a vertical light band having a lower edge, and in particular having sharp vertical edges;
• at least a first primary optical means comprises a face, upper or lower, having the shape of a cylindrical portion;
• the entry face of at least one primary optical means extends at least partially in a plane inclined with respect to the plane in which the rear face of the correcting part extends by an angle of between 0 ° and 45 ° ;
• at least a first primary optical means comprises at least one spreading face, said spreading face being shaped so as to widen the cross section of the primary optical means from its entry face to its exit;
• the first primary optical means and the associated first primary light sources, and arranged opposite the input face, are configured so that the rays emitted by these light sources enter the corresponding first primary optical means through the rear face and then propagate inside this first primary optical means towards the exit face, possibly by successive total internal reflections on the lower, upper and side faces;
• the cross section of each first primary optical means may have the shape generally of a parallelogram, and more precisely of a rectangle;
• the first primary optical means are juxtaposed and form, arranged at regular intervals, a horizontal row so that secondary light sources are virtually arranged in series on the rear face of the correcting part, substantially on the focal surface object of the projection system , to be projected to infinity in this segmented arrangement;
• the upper face of each of the first primary optical means may be a curved surface having the overall shape of a cylindrical portion of a substantially ellipsoidal generatrix, which has in particular the effect of concentrating the light intensity in the upper part of the beam leaving the first optical means primary, which corresponds to a zone (called "range zone") located at the bottom of the matrix beam produced at the output of the light module and which corresponds to the cut-off zone at the junction with the beam Code produced at the output of the optical module by the interaction of the second primary light sources and the associated second primary optical means.

Provision may be made according to the invention that the or each second primary optical means is intended to receive a second primary light beam from a second primary light source arranged opposite its light input face and that 'it is designed to shape this second primary light beam so that the projection of this second primary light beam on the road has a higher cutoff. Where appropriate, the second primary optical means can be arranged so that the upper cutoff is a flat cut, or as a variant, has at least one oblique cutoff portion.

• la face inférieure du deuxième moyen optique primaire peut être une surface courbe ayant globalement une forme de portion cylindrique, ce qui a pour effet de concentrer l'intensité lumineuse dans la partie basse du faisceau sortant du deuxième moyen optique primaire, ce qui correspond à une zone située au plus proche de la coupure en sortie du module lumineux ; la face inférieure peut notamment être agencée sensiblement dans un agencement en miroir par rapport à la face supérieure des premiers moyens optiques primaires ;
• ces surfaces en regard jouent respectivement un rôle de plieuse à réflexion totale, c'est-à-dire un rôle de concentration du faisceau lumineux projeté en sortie des moyens optiques primaires correspondants ;
• les premiers et deuxième moyens optiques primaires se joignent, au niveau de leur face de sortie, en un bord dont le profil est celui de la coupure souhaitée pour le faisceau Code généré par le deuxième moyen optique primaire.

According to various characteristics specific to this second primary optical means, provision may be made for:

• the lower face of the second primary optical means may be a curved surface having the overall shape of a cylindrical portion, which has the effect of concentrating the light intensity in the lower part of the beam leaving the second primary optical means, which corresponds to a zone located closest to the output cut-off the light module; the lower face may in particular be arranged substantially in a mirror arrangement with respect to the upper face of the first primary optical means;
• these facing surfaces respectively play a role of total reflection bender, that is to say a role of concentrating the light beam projected at the output of the corresponding primary optical means;
• the first and second primary optical means join, at the level of their exit face, at an edge whose profile is that of the desired cutoff for the Code beam generated by the second primary optical means.

The primary optical means can take different forms without departing from the context of the invention, provided that they respect the tiered arrangement of two distinct series, which can moreover take distinct forms from one series to another. . In particular, these primary optical means can consist of light guides or else take the form of microlenses, pads or even collimators.

In addition, it is possible to envisage having a single second primary optical means, in particular for producing a static Code beam, or else having a plurality of second primary optical means, in particular for producing a dynamic Code beam. for adaptive lighting on bends, for example, or as part of a motorway function.

The invention also relates to an optical assembly comprising the primary optical element as described above and a plurality of primary light sources, a first primary light source being associated respectively with each of the primary optical means in series while a second source primary is associated with each of the convex shapes, or each of the optical profiles of the second primary optical means.

In such an optical assembly, provision could be made for the primary light sources to be mounted on a support extending both opposite the first primary optical means and the second primary optical means. And it could be envisaged that the support is not flat but that it can have an inclined shape to be facing light guides that are not necessarily arranged in the same vertical plane.

The invention further relates to a light module for a motor vehicle headlight, which comprises a plurality of primary light sources, a primary optical element as mentioned above and an associated secondary optical element. The various primary optical means of the primary optical element can be arranged on the primary optical element so that the outputs of the primary optical means are positioned in the vicinity of a focal surface object of a projection system formed by the primary optical element and the secondary optical element while the output of the primary optical means is offset longitudinally with respect to this object focal surface. Thus, it is possible with the same primary optical element to achieve on the one hand, by means of light sources and the series of separate primary optical means, a segmented road beam which is a clear image of the segmented arrangement of the outputs. guide on the corrective part of the primary optical element and on the other hand, through the intermediary of light sources and the continuous primary optical means, a Code beam made horizontally homogeneous, the vertical focusing being maintained to create a horizontal cutoff (of type code, for example) net.

Provision is made according to the invention for the distance between the primary optical element and the secondary optical element to be strictly greater than zero.

It is possible to provide for making patterns, of the “modulations” or “microstructures” type, on the surfaces of the secondary optical element 4 in order to deliberately add a controlled cutoff blur.

A light module according to the invention, in which a primary optical element carries stepped primary optical means capable of being opposite series of sources of distinct primary light, allows with a single means to achieve a plurality of optical functions, including in particular a function known as DBL (Dynamic Bending Light in English for mobile bending light) or a function called AWL (Adverse Weather Light in English, for traffic light bad weather). One and / or the other of these functions can in particular be easily achieved by modulating the light intensity emitted by the primary light sources opposite the primary optical means.

The invention also relates to a motor vehicle headlight comprising at least one light module as has just been presented.

• la figure 1 est une illustration en perspective d'un élément optique primaire et d'un élément optique secondaire d'un ensemble optique pour un module lumineux selon un premier mode de réalisation de l'invention ;
• la figure 2 est une vue de détail d'un élément optique primaire et d'une pluralité de moyens optiques primaires, sous forme de guides de lumière, solidaires de celui-ci ;
• les figures 3 et 4 représentent un faisceau lumineux au moins partiellement segmenté, la figure 3 représentant le faisceau produit par un unique ensemble optique tel qu'illustré sur la figure 1 tandis que la figure 4 représente les faisceaux produits par deux ensembles optiques agencés l'un par rapport à l'autre de manière à ce que les faisceaux respectifs se superposent ;
• la figure 5 est une vue en coupe verticale de l'ensemble optique illustré sur la figure 1, dans lequel l'élément optique secondaire n'est pas visible ; et
• la figure 6 est une superposition de deux vues en coupe horizontales, l'une selon l'axe X-X représenté sur la figure 5 et illustrant la coupe de premiers guides de lumière de l'élément optique primaire, l'autre selon l'axe X'-X' également représenté sur la figure 5 et illustrant la coupe de deuxièmes guides de lumière.

Other characteristics and advantages of the present invention will emerge more clearly with the aid of the description and the drawings, among which:

• the figure 1 is a perspective illustration of a primary optical element and a secondary optical element of an optical assembly for a light module according to a first embodiment of the invention;
• the figure 2 is a detail view of a primary optical element and of a plurality of primary optical means, in the form of light guides, secured thereto;
• the figures 3 and 4 represent an at least partially segmented light beam, the figure 3 representing the beam produced by a single optical assembly as illustrated on the figure 1 while the figure 4 shows the beams produced by two optical assemblies arranged with respect to each other so that the respective beams are superimposed;
• the figure 5 is a vertical sectional view of the optical assembly illustrated in figure 1 , wherein the secondary optical element is not visible; and
• the figure 6 is a superposition of two horizontal sectional views, one along the XX axis shown in figure 5 and illustrating the section of first light guides of the primary optical element, the other along the axis X'-X 'also shown in figure 5 and illustrating the section of second light guides.

In the following description, reference will be made to the orientation given arbitrarily as a function of the trihedron L, V, T illustrated on figure 1 and representative of the representative directions Longitudinal, Vertical, Transversal.

The lighting module comprises a plurality of primary light sources, arranged in two distinct series superimposed in a first direction, here vertically one above the other, a series of first primary light sources 1 (visible in particular on the figure 2 ) being here arranged under a series of second primary light sources 2. The module further comprises a primary optical element 3 and a secondary projection optical element 4, having an optical axis A ₁ .

By definition, the front and rear of the module are defined by the direction of the arrow representative of the longitudinal direction of the trihedron L, V, T of the figure 1 .

The first and second primary light sources 1 and 2 are, in the particular example described here, light-emitting diodes, or LEDs. However, the light-emitting diodes could be replaced by other light sources, without departing from the context of the invention. These primary light sources 1 and 2 are carried by the same support 5 (visible on the figure 5 ), which makes it possible to limit the number of parts of the light module.

The primary optical element 3 comprises a correcting part 6 and a light introduction part 7 through which the light rays emitted by the first and second primary light sources 1 and 2 enter the primary optical element to be then conducted. in the corrective part. The light introduction part 7 comprises in a stepped arrangement, that is to say one above the other in the first direction here vertical, on the one hand a plurality of first primary optical means 8, here light guides, also called waveguides or optical guides, respectively associated with the first primary light sources 1, and on the other hand a second primary optical means 9, here a single light guide forming a strip of material extending in a second direction, here transverse, continuously and arranged plumb of the first guides 8 and of which a rear face 90, opposite to the correcting part 6, is arranged opposite the second primary light sources 2.

According to the invention, two types of primary optical means are connected to the same correcting part 6 transmitting light to a secondary optical element 4.

A first type consists of a plurality of first primary optical means 8, substantially separated from each other and arranged in series in the second transverse direction, while the second type consists of a single second primary optical means 9 formed by a strip of material which extends substantially over the entire length of the series of first primary optical means 8. A distinction is made between the separate character of the first primary optical means 8 and the continuous nature of the second primary optical means 9 by the fact that two first primary optical means 8 contiguous are spaced from each other over at least half of their longitudinal dimension. The fact that they are substantially separated from one another is understood to mean the junctions of the primary optical means with machining and / or injection radii due to the constraints of the methods for producing the primary optical element.

It is advantageous that at least one of the two types of primary optical means forms with the correcting part 6 a single-piece structure. The term “one-piece structure” is understood to mean that the elements of the structure cannot be separated without destruction of at least one of the elements. In the example shown on figure 1 , it was expected that the first primary optical means in series had come integral with the corrective part 6 and that the second primary optical means 9 was attached against the rear face of the corrective part and made integral with the latter, but we understands that the light introduction part 7 in its entirety (here, with the first primary optical means in series 8 and the second primary optical means in strip 9) could be integrated in order to form a single-piece structure with the corrective part 6 .

The first and second primary optical means are arranged on either side of the optical axis of the module, and the junction between these first and second primary optical means can pass, as can be seen on the diagram. figure 5 , by this optical axis.

It will be understood that, if in the illustrated embodiment the primary optical means are constituted by light guides, these primary optical means may be constituted, in particular in the part making it possible to generate a code beam, by microlenses, pads or collimators. In particular in the latter case, it is possible to provide collimators of revolution or else horizontal collimators, that is to say collimators having horizontally a collimator profile which has been extruded along a vertical curve. Hereinafter, the term “light guide” will denote any primary optical means.

The corrective part 6 is a portion of a sphere, or a portion of a ball, centered on the outlet of one of the first guides. More precisely, in the particular example of figure 1 , the corrective part 6 is a half-ball, the center of which is located in the exit plane of this first guide and on the optical axis A ₁ . As a variant, the exit plane of this first guide could be substantially offset from the center of the sphere by a distance less than or equal to 10% of the value of the radius of the sphere, preferably along the optical axis. . The front surface of the corrective part 6, in particular in the form of a spherical dome or spherical portion, constitutes a front output face 61 facing the secondary optical element 4. The rear face 60 of the corrective part 6 extends here in the sectional plane of the hemisphere. It could, however, have any form whatsoever, subject to ensuring the connection with the outputs of the first light guides 8 and the output of the strip of material forming the second light guide 9 and not modifying the trajectory of the rays coming from the rays. output ends of the guides and propagating in the corrective part 6.

The projection system formed by the corrective part 6 and its exit face 61 and by the secondary optical projection element 4 defines an object focal surface SF, visible in particular on the figures 5 and 6 .

As will be described in more detail below, the shape of the rear face 60 of the correcting part can be defined so that the exit surface of a first type of guides is disposed substantially on the object focal surface of the system. projection formed by the corrective part 6 and by the secondary optical element 4 and so that the exit surface of the second type of guide is offset longitudinally, that is to say axially along the optical axis, with respect to the focal object surface.

In the illustrated embodiment, the correcting part 6 has the shape of a half-ball or half-sphere defined by the rear face 60 forming the section plane and by the substantially spherical outlet face 61. Other embodiments are conceivable.

By way of example, the correcting part may be a portion of a truncated ball, that is to say cut on each side of the spherical portion formed on the exit face. Again, the correcting part 6 may have the shape of a slightly deformed half-ball, in particular with portions of the ball which extend according to a progressive radius of curvature until reaching the rear face 60 of the correcting part 6.

In each of these shape variants, it is notable that the light introduction part 7 and the corrective part 6 are made of the same material and have the same refractive index. The term “same refractive index” is understood to mean that the refractive index of the light introduction part 7 and that of the correcting part 6 are equal to the nearest hundredth. By "same material" is meant to mean that the corrective part 6 and the part for introducing the light 7, and within the latter the first light guides 8 separated from each other and the second light guide 9 unique band-shaped, are made of the same material or are made from the same polymer. If they come from the same polymer, the first and second guides can have a different load from that of the corrective part 6. By way of illustrative example, the guides can be made of PMMA-HT (from English Polymethyl MethAcrylate High Temperature - High Temperature polymethyl methacrylate) with a refractive index equal to 1.490 and resistant to high temperatures, and the correcting part in PMMA-8N with a refractive index equal to 1.491 and less expensive.

Provision can also be made for the first and second guides to be loaded differently, it being understood that it is appropriate to ensure that the first light guides 8, individually associated with a first primary light source, are resistant to high temperatures.

The material constituting the correcting part 6 on the one hand, and the first light guides 8 and the second strip-shaped guide 9 forming the light introduction part 7 on the other hand, is transparent. This is a material for an optical lens, such as an organic material or possibly glass.

We will refer more particularly to figures 1 and 2 to describe in more detail and first individually the first 8 and second 9 light guides.

Each first light guide 8 extends along a longitudinal axis and comprises at each of its longitudinal ends a rear face 80 for entering the light, arranged opposite one of the first primary light sources 1, and a front outlet, or outlet end or outlet interface, 81 playing a role of secondary light source, connected to the corrective part 6. It further comprises, to connect its two longitudinal end faces, two side faces 82, an upper face 84 and a lower face 85.

For each pair formed of a first primary light source 1 and an associated first light guide 8, the distance between an exit plane of the light source and the entry face of the associated first guide is between 0 , 1 millimeter and 1 millimeter.

The first light guides 8 and the associated first primary light sources 1, and arranged opposite the entry face, are configured so that the rays emitted by these light sources enter the corresponding first guide via the rear face 80 then propagate inside this first guide towards the exit face 81, possibly by successive total internal reflections on the lower, upper and side faces.

The cross section of each first light guide 8 (that is to say transversely to the optical axis of the guide) here generally has the shape of a parallelogram, and more precisely of a rectangle. However, the cross section of the first guides could be of any shape. It could for example include curved sides. In any event, it is suitable for producing a desired shape of light beam at the output of the light module.

The outputs 81 of the first light guides 8, here rectangular, constitute secondary light sources intended to produce respective light beams at the output of the light module. These light beams have generally rectangular shapes in cross section (that is to say transversely to the optical axis A ₁ ).

The first guides 8 are juxtaposed and form, arranged at regular intervals, a horizontal row so that secondary light sources are virtually arranged in series on the rear face of the corrective part, substantially on the focal surface object of the projection system, to be projected endlessly in this segmented arrangement.

As can be seen on the figure 2 in particular, the upper face 84 of each of the first guides 8 is a curved surface having the overall shape of a cylindrical portion of a substantially ellipsoidal generatrix. This has the effect of concentrating the light intensity in the upper part of the beam exiting the first guide 8, which corresponds to a zone (called the “range zone”) located at the bottom of the matrix beam produced at the output of the light module and which corresponds to the cut-off zone at the junction with the beam Code produced at the output of the optical module by the interaction of the second primary light sources and of the associated second light guide 9.

The lower faces 85 of the first light guides 8 are spreading faces shaped so as to widen the cross section of these first guides, continuously, from its entry face to its exit face, each first guide. flaring down from its entrance to its exit. The lower faces 85 are here curved and have a flared shape. As a variant, they could be plane and inclined relative to the longitudinal axis of the first guides. The lower, or bottom, widening of each first guide allows vertical spreading downward of the secondary light source 81 at the exit of the first guide, which corresponds to an upward spreading of the corresponding region of the beam. Thanks to the shaping of the bottom of the first guides 8, the top of each contiguous region is softened, the light intensity decreasing vertically upwards in a progressive manner.

On the figure 5 , illustrating in vertical and longitudinal section the primary optical element 3 and the associated primary light sources 1, 2, it can be clearly seen that, as has been specified previously, the second light guide 9 is arranged above the first light guides. We will now describe this second light guide in more detail, again with reference to the figures 1 and 2 .

The second light guide 9 is a single guide extending over substantially the entire transverse dimension of the primary optical element 3. Unlike the first light guides which consist of a plurality of guides independent of each other and providing guidance of the elements. only light rays emitted by the light source which is associated with them, the second light guide has the shape of a single continuous strip of material on one side transverse to the other of the primary optical element.

The second light guide 9 has two vertical end faces, one of which is facing the first light guides and a rear face 90 for entering the light, arranged facing a series of second primary light sources 2. , said rear face 90 being opposite a front outlet, or outlet end or outlet interface, 91 acting as a secondary light source, connected to the corrective part 6.

It is notable in the illustrated embodiment that the rear face 90 of the light inlet has a transverse succession of convex shapes, here having a shape of regular boss 92, so that the rear face of the second light guide has a shape wavy. This wavy shape is oriented so that the center of each boss is turned away from the corrective part 6, in the direction of the approach of the light sources. Each boss is disposed facing one of the plurality of second primary light sources 2, these sources and the second light guide being configured and mounted facing each other so that the optical axis of a second primary light source 2 is centered on the middle of one of the bosses 92. The bosses are arranged in transverse series so that the end edges 93 of the bosses are contiguous two by two, and it is thus known to define a secondary input face 94 of this second primary optical means, identified as the surface connecting one after the other the end edges 93 of the bosses.

In other words, we can define the second primary optical means, which extends overhanging the first primary optical means, in a succession of second primary optical means in a second direction, here transverse, and it can be considered that each second primary optical means comprises a junction part 95 with the corrective part 6 and an optical profile 96 installed at a free end of the junction part, opposite to the corrective part, the junction parts of the second primary optical means forming a common junction part extending continuously in the second direction.

As has been seen previously for the arrangement of the light sources facing the first light guide 8, for each pair formed of a second primary light source 2 and a boss of the associated second light guide 9, the distance between an exit plane of the light source and the entry face of the associated second guide is between 0.1 millimeters and 1 millimeter.

The second light guides 9 and the associated second primary light sources 2, and arranged opposite the bosses 92 of the entry face, are configured so that the rays emitted by these light sources enter the second guide. corresponding by the rear face 90 then propagate inside this second guide towards the exit face 91, possibly by successive total internal reflections on an upper face and a lower face 97, turned towards the first light guides 8. It will be understood that in the case of the second light guide, the rays emitted by a second primary light source 2 through one of the bosses 92 of the rear face 90 of the input of the rays can cross, between the secondary entry face 94 and the exit face 91, with the rays emitted by another second primary light source through another of the bosses. It is thus possible to produce a more homogeneous beam horizontally since the secondary image created on the exit face 91 of the second primary optical means 9, and thus disposed on the object focal surface SF of the projection system, results from a possible crossing beam emitted by different second primary light sources.

On the figure 5 , the lower face 97 of the second guide 9 is a curved surface having the overall shape of a cylindrical portion, substantially in a mirror arrangement with respect to the upper face 84 of the first guides. This has the effect of concentrating the light intensity in the lower part of the beam exiting the second guide 9, which corresponds to a zone located closest to the cut-off at the exit of the light module. The spacing of the opposite faces of the first and second guides also participates in the production by molding of a single part to form the primary optical element 3, by forming a clearance angle sufficient for the part to be released from the mold. Particular attention is paid to the curvature of this lower face 97 of the second guide 9 and to the transverse line of contact between this lower face 97 of the second guide 9, the rear face 60 of the corrective part 6, and the upper face 84 of the first guides, since this participates in the formation of the cutoff of the beam.

In the particular example described here, the first light guides are ten in number and the second light guide 9 has on its input face 90 six bosses 92. The result is that ten first primary light sources and six second Primary light sources are arranged on the common support 5 facing the light guides. Of course, these numbers could vary, being however preferably strictly greater than one, and they could be equal so that as many first independent guides would be provided as there are bosses on the second single guide.

In the context of a light module provided in a left or right headlight of a vehicle, and therefore of a light beam generated by a module of a left headlight superimposed on a light beam generated by a module of a right headlight, it is possible to provide an offset transverse of the first independent light guides participating in the formation of contiguous regions of the beam, without however having to provide a transverse offset of the second single light guide. It is understood that if the first and second light guides can be offset transversely relative to one another, their stepped arrangement one above the other remains the same.

On the figures 5 and 6 , we made visible a characteristic of the invention relating to the position of the exit faces of the various light guides with respect to the focal object surface SF defined by the projection system formed by the corrective part 6 of the primary optical element and by the secondary optical element 4. The outputs 81, 91 of the first and second light guides 8 are positioned on this focal object surface SF. And it is advantageous, for the reasons mentioned above, that the secondary inlet face 94, that is to say the curved surface passing successively through each of the end edges of the bosses, is disposed upstream of the focal surface. object SF with respect to the direction of emission of light from the optical assembly formed by the sources and the primary optical element. The secondary input face 94, identified as the surface connecting the end edges of the bosses one after the other, is defocused, and the projected image of the resulting secondary light source on the focal surface SF, at the junction of the second primary optical means and of the correcting part is horizontally homogeneous due to the mixing of the rays emitted by neighboring light sources between the secondary input face 94 and the output face 91. This results from the design of the second primary optical means according to which, as may have been specified previously, the latter extends continuously between the secondary input face 94 and the output face 91.

The figure 3 represents the light beam 100 projected at the output of the light module. One can in particular distinguish light segments 110 respectively produced by the secondary light sources 81 at the output of the first guides 8, as well as the wide beam 120 formed by the second primary light sources and the associated second light guide. It is understood that in the case illustrated in the figures, the switching on of the second primary light sources creates a Code beam and the switching on of all the primary light sources, the first as well as the second, creates a High beam, with an upper part, capable of dazzling users on the road scene, which is matrix with contiguous regions, for example segments, which can be selectively turned off to avoid this dazzling. It is understandable, in particular by referring to the figure 3 , that the production of a matrix beam with first distinct light guides arranged in transverse series generates an infinite projection of contiguous regions, and for example segments, quite distinct. The presence of two modules in the same projector can allow a slight angular shift, horizontally, to make the projected beam homogeneous in this plane as shown in the diagram. figure 4 , in which the superposition of two beams 100 'and 100 "has been illustrated, generated by two modules arranged in the same projector, here on the left. It may be advantageous to have at least one light module as described in two projectors in order to superimpose, by a transverse shift of a few degrees, a left light beam and a right light beam and superimpose both two wide beams and two segmented beams, and thus obtain a denser and more homogeneous beam as illustrated on the figure 4 .

With reference to figures 1 and 2 , the row of first light guides 8 comprises a left side end guide 8j and a right side end guide 8a, in the transverse direction. The left end guide is intended to produce a right light segment. Conversely, the right end guide is intended to produce a left light segment. The first left end guide 8j may include a left side spreading face 82 shaped to continuously widen laterally the cross section of the guide from its entry face to its exit. The left side face 82 can be curved to flare from the rear inlet face 80 of the first left end guide 8j to its outlet 81. The lateral widening of the first left end guide 8j allows spreading. side to the left of the secondary light source at the exit of the first left end guide 8j, which here corresponds to a lateral spread to the right of the light segment produced as shown on the figure 4 . Thanks to the shaping of the left side of the first left end guide 8j, the right edge of the corresponding light segment is softened, the light intensity gradually decreasing laterally towards the right.

It should be noted that the light module shown on the figures 1 and 2 is intended to equip a left headlight of a motor vehicle, and that the figures 3 and 4 correspond to beams produced by modules in this left projector. And it is understood that the light module intended for a right headlight of a motor vehicle symmetrically comprises a first left end light guide 8a having a flared right side face similar to the left side face of the first left end guide. 8 days from the figure 2 .

The light rays transmitted through the light introduction part, after passing through the correcting part 6, propagate towards the secondary projection optical element 4 and pass through the latter.

The role of the corrective part 6, in cooperation with the first 8 and second 9 light guides, is twofold.

On the one hand, it improves the optical efficiency of the light module. The entry of each of the first guides 8 has the effect of reducing the aperture of the light rays emitted by the primary light sources 1 and 2, the rays entering the light guides 8 and 9 being deflected by the laws of refraction . Further, at the interface between each light guide 8,9 and the correcting part 6, the light rays are not deflected due to the connection between the first guides 8 and the correcting part 6. Thanks to this, the reduced shelf opening is retained. Finally, the light rays coming out of the corrective part 6 via the exit face 61 are not or only slightly deflected thanks to the spheroidal dome shape of the exit face 61. Indeed, the half-spherical correcting part 6 being centered on the junction at the exit of one of the first guides and of the second guide, a ray coming from the exit plane of this first guide at the level of the optical axis A ₁ is normal or almost normal to the outlet face 61 and is therefore not deflected at the interface between the correcting part 6 and the surrounding air. A ray coming from a zone away from the optical axis is bent towards this optical axis. The refraction at the interface between the correcting part 6 and the surrounding medium (air) is in a way “compensated” by the spherical, or substantially spherical, shape of the outlet face 61.

The correcting part 6 also makes it possible to correct the field aberrations of the optical system and thus ensure good quality imaging: the secondary optical element 4 is here a converging optical lens having the axis A _{1 as} its optical axis . The distance separating the corrective part 6 and the secondary optical element 4 is strictly greater than zero and adapted so that the plane in which the outlets of the first light guides extend substantially coincides with the object focal plane of the projection system formed by the secondary optical element 4 and by the primary optical element 3. Thanks to this, the light module is adapted to create an infinite image of the secondary light sources formed at the output ends of the guides. It is thus possible to generate several light segments, with good imaging, using the same primary optical element 3 and from light guides positioned on or outside the optical axis A ₁ . The half-ball forming the corrective portion 6, by slightly modifying the orientation of the rays emitted by the outputs of the guides which are offset with respect to the optical axis A ₁ , at the output interface 61, has a corrective effect of field.

The foregoing description clearly explains how the invention makes it possible to achieve the objectives it has set for itself and in particular to provide a light device which facilitates the design and manufacture of a plurality of optical guides as well as their installation. in a module next to light sources for guiding light rays and creating an adaptive beam.

The device according to the invention makes it possible to dispense with relative positioning games between the guides associated with a Code function and a Route function, by the monobloc production of at least one series of these guides and of the corrective part associated with the all of these guides.

As was specified previously, it is particularly advantageous to associate this correcting part 6 with an arrangement of particular light guides in that two distinct types of guides are superimposed, arranged in particular differently with respect to the focal plane which is the object of the detection system. projection formed by the output interface 61 of the correcting part 6 and by the secondary optical element 4. The outputs of the first guides define the secondary images associated with these first guides and are positioned in the object focal surface SF of the projection system , so that the beams leaving the secondary optical projection element 4 and corresponding to the rays emitted by the first primary light sources, that is to say the sources corresponding to the upper part of the road beam, are beams parallel rays forming light segments of generally rectangular shape.

The second primary optical means is arranged with respect to the object focal surface SF of the projection system so that the curve which bears the transverse ends of each of the patterns formed in series on the input face of the first guide is defocused, in upstream of this focal object surface.

It will be emphasized here that the light module of the invention has excellent optical efficiency. The luminous flux emitted by the primary light sources undergo little loss in the corrective part and they are largely recovered at the output of the module to create light beams capable of forming light segments on the one hand for the complementary road beam and an overall wide beam for the code beam.

In addition, the light module can produce, with simple means and a corrective part common to the primary light sources, light segments for the additional road beam, the shapes of which are perfectly controlled and a Code beam made horizontally homogeneous by the defocusing of the strip of continuous material allowing the rays to be spread in the corrective part. Patterns of the “modulations” or “microstructures” type could be added to the surfaces of the secondary optical element 4 to deliberately add a controlled cutoff blur.

It will be understood that the production of a primary optical element carrying stepped light guides capable of being opposite series of distinct primary light sources makes it possible with a single means to achieve a plurality of optical functions, including in particular a so-called DBL function. (Dynamic Bending Light in English for mobile bending lighting) or a so-called AWL (Adverse Weather Light in English, for bad weather light). One and / or the other of these functions is easily carried out by modulating the light intensity emitted by the primary light sources opposite the light guides. For example, it is possible gradually, from right to left or from left to right depending on the direction of the turn detected, to increase the intensity of the light sources to increase the visibility on one side of the overall light beam and thus perform a function DBL. In the event of a rainy road, it is possible to reduce the light intensity of the second primary light sources which are close to the optical axis.

Of course, various modifications can be made by those skilled in the art without departing from the context of the invention, it being understood that the invention cannot be limited to the embodiment specifically described in this document, and that it extends in particular to any equivalent means and to any technically operative combination of these means.

• il a été décrit précédemment que les sources de lumière primaires sont montées sur un même support, ce qui permet de limiter le nombre de pièces de l'ensemble lumineux. On comprend que ce support pourra être plan, tel que cela est illustré sur la figure 5, ou présenter deux parties inclinées l'une par rapport à l'autre d'un angle, si l'on souhaite qu'une série de sources primaires émettent parallèlement à l'axe optique et que l'autre série de sources primaires émette avec un angle donné par rapport à l'axe optique.
• tel que cela a pu être illustré et décrit, il est possible que le deuxième guide de lumière, disposé au-dessus des premiers guides indépendants les uns des autres et formé par une bande unique aux faces d'entrée de lumière bombées, soit réalisé d'un seul tenant avec la partie correctrice, elle-même d'un seul tenant avec les premiers guides, de manière à former une structure monobloc dans son ensemble, ou bien il est possible que le deuxième guide en bande soit réalisé à part, étant entendu que sa réalisation est simple par rapport à la réalisation multiples des premiers guides, et que son montage sur l'élément optique primaire ne pose pas de problème du fait qu'il s'étend sur toute la dimension transversale de l'élément optique primaire et donc qu'il peut être fixé sur la partie correctrice en dehors de la zone de contact des faces de sortie des guides et de la face arrière de la partie correctrice où passent les rayons lumineux. On pourra privilégier ce mode de réalisation, avec un deuxième guide rapporté sur la partie correctrice après avoir été fabriqué par ailleurs, pour diminuer l'écartement entre les faces supérieures des premiers guides et la face inférieure du deuxième guide, cet écartement étant rendu nécessaire dans le cas d'une réalisation monobloc de l'ensemble pour faciliter le démoulage.
• dans ce qui précède, on a précisé que la face d'entrée du deuxième guide de lumière, qui s'étend de manière continu au-dessus des premiers guides de lumière, était munie de bossages successifs, chaque bossage étant associé à une source lumineuse primaire spécifique. On pourra prévoir d'avoir une bande de matière à la face d'entrée sensiblement plate, sans bossage, dès lors que l'on a une source de lumière primaire associée qui s'étend sensiblement sur toute la dimension transversale de ce deuxième guide de lumière.
• dans la description qui précède, l'élément optique de projection est une lentille. En variante, la lentille pourrait être remplacée par tout autre élément optique de projection, apte à créer à l'infini une image des sorties des guides de lumière. Cet élément de projection pourrait comprendre une ou plusieurs lentilles, ou un ou plusieurs miroirs réflecteurs, ou bien une combinaison de miroir(s) et de lentille(s).
• dans la description qui précède, l'élément de projection a pour effet d'inverser la sortie des guides de lumière : le haut de la source de lumière secondaire à la sortie d'un des guides de lumière correspond au bas du faisceau produit en sortie du module lumineux, et inversement, et la zone droite de la source de lumière secondaire à la sortie d'un des guides de lumière correspond à la zone gauche du faisceau produit en sortie du module lumineux, et inversement. Dans une autre forme de réalisation, l'élément de projection n'a pas d'effet d'inversion. Dans ce cas, les formes de la partie d'introduction de la lumière 7 et de la partie correctrice 6 doivent être adaptées en fonction de la forme des faisceaux lumineux souhaités à la sortie du module lumineux. L'invention concerne aussi un projecteur pour véhicule automobile intégrant un ou plusieurs modules optiques d'éclairage selon l'une quelconque des formes de réalisation décrites.

In particular, a non-exhaustive list of possible variants can be found below, which come within the scope of the invention:

• it has been described above that the primary light sources are mounted on the same support, which makes it possible to limit the number of parts of the light assembly. It will be understood that this support could be flat, as illustrated in the figure 5 , or have two parts inclined relative to each other at an angle, if it is desired that a series of primary sources emit parallel to the optical axis and the other series of primary sources emit with a given angle with respect to the optical axis.
• as has been illustrated and described, it is possible that the second light guide, arranged above the first guides independent of each other and formed by a single strip with curved light entry faces, is made of 'in one piece with the corrective part, itself in one piece with the first guides, so as to form a single-piece structure as a whole, or else it is possible that the second strip guide is produced separately, being understood that its realization is simple compared to the multiple realization of the first guides, and that its mounting on the primary optical element does not pose a problem because it extends over the entire transverse dimension of the primary optical element and therefore that it can be fixed on the corrective part outside the contact zone of the output faces of the guides and of the rear face of the corrective part where the light rays pass. This embodiment can be favored, with a second guide attached to the corrective part after having been manufactured elsewhere, to reduce the distance between the upper faces of the first guides and the lower face of the second guide, this spacing being made necessary in the case of a one-piece construction of the assembly to facilitate demolding.
• in the foregoing, it was specified that the input face of the second light guide, which extends continuously above the first light guides, was provided with successive bosses, each boss being associated with a light source specific primary. Provision may be made to have a strip of material at the substantially flat entry face, without boss, since there is an associated primary light source which extends substantially over the entire transverse dimension of this second guide of light.
• in the above description, the optical projection element is a lens. As a variant, the lens could be replaced by any other projection optical element, capable of creating an image of the outputs of the light guides to infinity. This projection element could comprise one or more lenses, or one or more reflecting mirrors, or else a combination of mirror (s) and lens (s).
• in the above description, the projection element has the effect of reversing the output of the light guides: the top of the secondary light source at the output of one of the light guides corresponds to the bottom of the beam produced at the output the light module, and conversely, and the right zone of the secondary light source at the output of one of the light guides corresponds to the left zone of the beam produced at the output of the light module, and vice versa. In another embodiment, the projection element has no inversion effect. In this case, the shapes of the light introduction part 7 and of the correcting part 6 must be adapted according to the shape of the light beams desired at the output of the light module. The invention also relates to a headlight for a motor vehicle integrating one or more optical lighting modules according to any one of the embodiments described.

Claims (17)

1. Primary optical element (3) for motor vehicle lighting module, comprising a light introduction part (7) provided with a plurality of primary optical means (8,9) connected at output to a correcting part (6), said primary optical means being arranged on at least two levels in a first direction, as first (8) and second (9) distinct primary optical means, a plurality of first primary optical means being arranged in series in a second direction substantially perpendicular to the first direction the primary optical element (3) characterizing in that the second primary optical means (9) consists of a strip of material extending continuously in the second direction, overhanging the first primary optical means (8).
2. Primary optical element (3) according to claim 1, characterized in that the primary optical means (8,9) have an output face (81,91) connected to the correcting part (6) and a light input face (80,90) facing away from this correcting part (6).
3. Primary optical element (3) according to one of the preceding claims, characterized in that the input face (90) of the second primary optical means (9) has a plurality of convex shapes (92).
4. Primary optical element (3) according to one of claims 2 to 3, characterized in that the second primary optical means (9) consists of a succession of second primary optical means, each one comprising a junction part (95) making the junction with the correcting part (6) and an optical profile (96) installed at a free end of the junction part in order to form said input face (90), on the opposite side to the correcting part, the junction parts of the second primary optical means forming a common junction part extending continuously in said second direction.
5. Primary optical element (3) according to one of claims 2 to 4, characterized in that the output faces (81,91) of the first (8) and second (9) primary optical means are positioned near an objective focal surface (SF) of a projection system comprising at least said correcting part (6).
6. Primary optical element (3) according to the preceding claim, characterized in that a secondary input face (94) consists of a curved surface, passing in succession through each of the end edges (93) of the convex shapes (92), and positioned upstream, with respect to the direction in which the light is emitted, of said objective focal surface (SF).
7. Primary optical element (3) according to one of the preceding claims, characterized in that said correcting part (6) comprises an output face (61) at least partially in the shape of a substantially spherical dome.
8. Primary optical element (3) according to the preceding claim, characterized in that the output face (61) in the shape of a substantially spherical dome is centered substantially between the first primary optical means (8) and the second primary optical means (9).
9. Primary optical element (3) according to one of the preceding claims, characterized in that the first primary optical means (8) and the correcting part (6) form a monoblock structure.
10. Primary optical element (3) according to the preceding claim, characterized in that the second primary optical means (9) forms a monoblock structure with said correcting part (6) and said first primary optical means (8).
11. Primary optical element (3) according to one of the preceding claims, characterized in that the respective refractive indices of the primary optical means (8,9) and of the correcting part (6) are substantially identical.
12. Primary optical element (3) according to one of the preceding claims, characterized in that the primary optical means (8,9) and the correcting part (6) are manufactured from the same material.
13. Optical assembly comprising the primary optical element (3) according to one of the preceding claims, a plurality of primary light sources (1,2), a first primary light source being associated respectively with each of the first primary optical means (8) in transverse series, whereas at least one second primary source is associated with the second primary optical means (9).
14. Optical assembly according to the preceding claim in combination with at least claim 3 or 4, characterized in that a second primary source (9) is associated with each of the convex shapes (92), or each of the optical profiles (96), of the second primary optical means (9).
15. Optical assembly according to one of claims 13 and 14, in which the primary light sources (1,2) are mounted on a support (5) extending both opposite the first primary optical means (8) and opposite the second primary optical means (9).
16. Lighting module for motor vehicle headlight, characterized in that it comprises a plurality of light sources (1,2), a primary optical element (3) according to one of claims 1 to 12 and an associated secondary optical element (4).
17. Lighting module according to the preceding claim, characterized in that the various primary optical means of the primary optical element are arranged on the primary optical element in such a way that the outputs of the first primary optical means (8) are positioned near an objective focal surface (SF) of a projection system formed by the primary optical element and the secondary optical element, whereas the output of the second primary optical means (9) is offset longitudinally with respect to this objective focal surface.

Images