EP1746340B1 - Optical module for a motor vehicle lighting device - Google Patents

Abstract

In an optical module for an automobile light which emits beam(s) with a cut-off portion, comprising a light source within a reflector (R), a dioptric element (L) in front of the reflector and a screen (C) between the source and element to intercept some emitted light rays, an additional reflective optical element (EO), between the source and the screen and near the screen, redirects light rays emitted towards the screen above the screen edge. An optical module (specifically an elliptical module) for an automobile light which emits beam(s) with a cut-off portion comprises a light source within a reflector (R), a dioptric element (L) (specifically a convergent lense) in front of the reflector and a screen (C) between the source and the dioptric element, having active position(s) in which some emitted light rays are intercepted to cut off part of the beam. The novel feature is that an additional optical element (EO) with reflective surface(s), located between the source and the screen and near the active edge of the screen, redirects light rays emitted in the direction of the screen above the active edge of the screen. An independent claim is included for an automobile headlight having at least one of the optical elements.

Description

The present invention relates to an optical module for automobile lighting device of the projector type. It applies more particularly to optical modules called elliptical modules comprising a light source associated with a reflector and closed by a dioptric element of the convergent lens type, for example a plano-convex lens, Fresnel lens. The invention is concerned with optical modules equipped with a fixed or movable cover able to intercept at least partially, depending on its position, the light beam emitted by the light source / reflector assembly. The shape of the upper edge of the cache makes it possible to define the desired cut in the beam by imaging with the convergent lens. For more details on mobile cache modules, refer to the patents EP 1 197 387 , EP 1 422 471 or EP 1 422 472 . The mobile cover, on command and thanks to the presence of a motor, can take different positions with respect to the light source, including at least one position called "active" optically, that is to say a position where it obscures actually a part of the light beam, in particular for the module to emit a cut-off beam, such as a cross beam (oblique cut) or anti-fog (horizontal cut). The cache may thus have one or more "active" positions, for example two, one for the traffic crossing function on the right and one for the traffic function on the left, and also a so-called "passive" function where it does not block the beam. light, thus allowing the module to emit light beams without cutoff of the road beam type. For examples of fixed-cache modules, one can refer in particular to the patent FR 2 754 039 , which describes modules able to emit crossover beams or anti fog for example.

• de la fonction dite BL (Bending Light en anglais pour lumière virage), qui peut se décomposer en une fonction dite DBL (Dynamic Bending Light en anglais pour lumière virage mobile) et une fonction dite FBL (Fixed Bending Light en anglais pour lumière virage fixe).La fonction DBL permet de modifier l'orientation d'un faisceau lumineux produit par une source lumineuse, de telle sorte que lorsque le véhicule aborde un virage, la route soit éclairée de façon optimale. La fonction FBL a pour vocation d'éclairer progressivement le bas-côté de la route lorsque le véhicule effectue un virage ; à cet effet, on prévoit une source lumineuse supplémentaire qui vient compléter progressivement les feux de croisement ou de route lors de la négociation d'un virage ;
• de la fonction dite Town Light en anglais, pour feu de ville. Cette fonction assure l'élargissement d'un faisceau de type feu de croisement tout en diminuant légèrement sa portée ;
• de la fonction dite Motorway Light en anglais, pour feu d'autoroute. Cette fonction assure une augmentation de la portée d'un feu de croisement ;
• de la fonction dite Overhead Light en anglais, pour feu surélevé. Cette fonction assure une modification d'un faisceau de feu de croisement de telle sorte que des portiques situés en hauteur sont éclairés de façon satisfaisante au moyen des feux de croisement ;
• une fonction dite AWL (Adverse Weather Light en anglais, pour feu de mauvais temps). Cette fonction assure une modification d'un faisceau de feu de croisement de telle sorte que le conducteur n'est pas ébloui par un reflet de son propre projecteur.

In addition to these well-known lighting and signaling functions, new features have appeared recently, grouped together under the name of AFS (the abbreviation for "Advanced Front System" in English), which include other types of beams, the invention to implement them, including using caches adapted to generate cuts wanted; These include

• the function called BL (Bending Light in English for light bend), which can be broken down into a function called DBL (Dynamic Bending Light in English for light bend mobile) and a function called FBL (Fixed Bending Light in English for light bend fixed The DBL function makes it possible to modify the orientation of a light beam produced by a light source, so that when the vehicle approaches a turn, the road is illuminated optimally. The purpose of the FBL function is to gradually illuminate the side of the road when the vehicle is turning; to this end, there is provided an additional light source which gradually complements the low beam or road when negotiating a turn;
• of the so-called Town Light function in English, for town fire. This function ensures the widening of a beam type dipped beam while slightly decreasing its range;
• of the so-called Motorway Light function in English, for highway lights. This function ensures an increase in the range of a dipped beam;
• of the function called Overhead Light in English, for raised fire. This function ensures a modification of a beam of low beam so that gantries located at height are illuminated satisfactorily by means of dipped beam;
• a function called AWL (Adverse Weather Light in English, for fire of bad weather). This function ensures a modification of a beam of passing beam so that the driver is not dazzled by a reflection of his own projector.

Whether the cache is fixed or mobile, and whatever the type of cut that it defines in the beam, it remains that all the luminous flux which is intercepted by the cache is lost, and the light output, that is to say the ratio between the light emitted by the lamp and that returned at the output of the optical module, is not very satisfactory.

The object of the invention is therefore the development of a cache optical module of the type described above, in particular of the elliptical type, which has improved optical performance. In particular, it is a question of being able to increase the luminous efficiency of this type of module, without deteriorating the regulatory photometric characteristics of the cut-off beams obtained. Incidentally, the invention aims to achieve this goal without disrupting the design of current optical modules.

• une source lumineuse disposée dans un réflecteur,
• un élément dioptrique, notamment une lentille convergente, disposé à l'avant du réflecteur,
• un cache disposé entre ladite source lumineuse et ledit élément dioptrique et présentant au moins une position optiquement active où il intercepte une partie des rayons lumineux émis par la source occulte effectivement une partie du faisceau lumineux pour que le module émette un faisceau à coupure, le bord optiquement actif du cache étant propre à former une coupure dans le faisceau émis par le module,

The invention firstly relates to an optical module, in particular an elliptical module, for a lighting device for a motor vehicle, capable of emitting at least one type of light beam having a cutoff and comprising:

• a light source arranged in a reflector,
• a dioptric element, in particular a convergent lens, arranged at the front of the reflector,
• a cover disposed between said light source and said dioptric element and having at least one optically active position where it intercepts a portion of the light rays emitted by the source effectively obscures a portion of the light beam for the module to emit a cut-off beam, the edge optically active cache being able to form a cut in the beam emitted by the module,

In addition, an additional optical element is completely arranged between the light source and the cover, said additional optical element being in the vicinity of the optically active edge of the cover and having at least one reflecting surface capable of redirecting over the optically active edge of the cover of the light rays emitted by the source towards said cache.

Advantageously, at least one point of the additional optical element is located between the focus of the dioptric element of the convergent lens type and the reflector: this additional optical element is at least partly, in particular completely, disposed between the source and the cache or between the reflector and the cover.

For the purposes of this text, "source-light rays" means the rays directly emitted by the source and the rays indirectly emitted by the source, namely the rays emitted by the source and then reflected, in particular at least one times by the wall of the reflector in which the light source is located.

• on peut viser des performances optiques similaires avec des sources lumineuses moins puissantes et/ou des réflecteurs moins complexes,
• on peut aussi viser des performances optiques globalement meilleures, toutes choses égales par ailleurs, le gain de lumière étant utilisé pour obtenir des faisceaux globalement plus puissants et éventuellement présentant une distribution améliorée.

The additional optical element therefore has the function of recovering at least part of the luminous flux which would otherwise be intercepted by the cache and thus lost / wasted. Its design is then chosen so that it can "fold up" the rays before they reach the cache, preferably in a manner appropriate for these rays to effectively participate in obtaining the photometry of the desired cut-off light beam. This increase in the luminous efficiency of the module can be exploited in different ways:

• it is possible to aim at similar optical performances with less powerful light sources and / or less complex reflectors,
• one can also aim for overall better optical performance, all things being equal, the light gain being used to obtain beams that are generally more powerful and possibly having an improved distribution.

Advantageously, the optical module is of elliptical module type: the source is placed at a first rear focus of the reflector, or in the vicinity thereof, and the dioptric element is placed at the external focus of the reflector or in the vicinity thereof . The reflector is then shaped close to an ellipsoid.

The additional optical element can be integral or even integral part of the cache. It is possible to mount the optical element on the cover or the support of the cover by any known fastening means, in particular by clipping, crimping, welding, gluing, overmolding. We can also make the cache (or its support) and this optical element one piece.

The reflecting surface of the additional optical element preferably has an upwardly facing face, the leading edge of which substantially follows, at least locally, the profile of the optically active edge of the mask. This means that the front edge of the element substantially adopts the shape of the edge of the cache. Indeed, this choice has been judicious to minimize the risk of creating blur in the beam emitted by the module in the vicinity of the cut.

The term "front", "back", "up", "down", "upper" or "lower" is understood throughout the present text according to the position of the module once integrated, possibly in a projector, and mounted on a vehicle in normal operating mode.

One embodiment is that the front edge of the additional optical element is attached to the optically active edge of the cache.

The reflecting surface of the additional optical element has an upwardly facing face and is preferably disposed adjacent to only the central portion of the cover. This configuration makes it possible to recover light rays in the area of the cache receiving the highest luminous flux: with a remarkable economy of means (added element of reduced size), we thus already obtain a substantial increase in luminous efficiency.

The reflective surface of the additional optical element has an upwardly facing face and has a notch at its rear edge. The indentation can actually delimit two side zones that extend rearward to further enhance the recovery of light by coming "surround" the lamp (of course respecting a sufficient distance with the lamp).

The front edge of the face in question preferably comprises a broken line, namely a succession of line segments, without excluding possibly also curve portions.

This front edge is substantially preferably a generator for the shape of the upwardly facing face mentioned above. is then composed, for example, a succession of inclined planes relative to each other substantially aligned along the optical axis of the module.

The rear edge of the face in question preferably has a profile similar to, or identical to that of the front edge. It can also have a different profile, curve for example.

This is particularly the case when the face facing upwards has a left surface.

This face is preferably disposed in a substantially horizontal plane and transversely to the optical axis of the reflector, as may be the case of the cache as well. Its width is then understood by its dimension measured parallel to the optical axis, and its length perpendicular to it. In this case, its width (its smallest dimension) is at least 8 times, in particular at least 10 times smaller than its length (its largest dimension). Its thickness is low. For example, the additional optical element may be in the form of a plate of 2 to 6 mm, in particular 3 to 4 mm wide, and 35 to 60, in particular 40 to 50 mm long. And its thickness can be from 0.2 to 1.5 or 2 mm.

Advantageously, and particularly in the left configuration mentioned above, this face is curved along its length / largest dimension, with for example an arrow in the center of the order of 0.5 to 4 mm, especially 1 to 2 mm . The curved shape (upwards) is advantageous for contributing to ensuring good linearity of the cutoff of the light beam. It can help to compensate for any optical defects inherent in the reflector or the dioptric element.

According to one embodiment, the reflecting surface of the additional optical element has an upwardly facing face which is smooth. According to another embodiment, it comprises, at least locally, streaks and / or corrugations. These surface modifications give an additional possibility of controlling the distribution of the rays recovered in the beam emitted by the module: they make it possible in particular to spread the beam. They can be distributed over the entire reflecting surface, including the lateral areas mentioned above.

The ridges and / or undulations are preferably substantially oriented parallel to the optical axis of the module. The striations and / or undulations can be of evolutionary form, especially when the upwardly facing face referenced above is flat. It is understood by evolutionary streak, a streak whose starting profile and the arrival profile are different. The front profile begins at the optically active edge of the cover (which is generally straight), and the back profile is a radius or ripple. For example, corrugation steps of about 0.5 to 1.5 mm and arrows of 0.2 to 1 mm may be provided.

• on se permet ainsi d'avoir un réflecteur de moindre taille, permettant d'avoir un module optique plus compact sans être significativement pénalisé sur le plan optique par le gain en rendement obtenu avec l'élément optique
• additionnel selon l'invention.

According to a variant, the reflector is truncated in its lower part:

• it is thus possible to have a smaller reflector, to have a more compact optical module without being significantly penalized optically by the gain in performance obtained with the optical element
• additional according to the invention.

The cover can be a mobile cover for making a bi-function or multi-function projector, including a bi-function module code / route or a multifunction module.

The optical module according to the invention can emit at least one type of cut-off beam among those described at the beginning of this text.

The invention also relates to a motor vehicle headlamp equipped with at least one optical module as described above.

• Figure 1 : une vue en section selon un plan vertical d'un module optique selon l'invention
• Figure 2 : une vue en perspective du module selon la figure 1
• Figure 3a, 3b,3c : 3 variantes de la plieuse appartenant au module optique selon les figures précédentes
• Figure 4a, 4b,4c : 3 vues simplifiées de réseaux de courbes isolux de faisceaux lumineux émis par le module optique selon l'invention, illustrant l'apport de l'élément optique selon la variante de la figure 3b.

The invention will be detailed below with the help of a non-limiting example illustrated by the following figures:

• Figure 1 : a sectional view along a vertical plane of an optical module according to the invention
• Figure 2 : a perspective view of the module according to the figure 1
• Figure 3a, 3b, 3c: 3 variants of the folding machine belonging to the optical module according to the preceding figures
• Figure 4a, 4b, 4c : 3 simplified views of isolux curves networks of light beams emitted by the optical module according to the invention, illustrating the contribution of the optical element according to the variant of the figure 3b .

The elements appearing in different figures retain the same references.

• un réflecteur R dont la forme géométrique de la paroi réfléchissante tournée vers l'avant est proche d'un demi ellipsoïde. La figure représente un réflecteur tronqué dans sa partie inférieure. Une alternative est d'utiliser un réflecteur « complet », dont sa forme serait proche d'un ellipsoïde complet.
• une source lumineuse S non représentée, disposée au fond du réflecteur R de façon connue. Il peut s'agir d'une lampe halogène, d'une lampe xénon, ou d'une ou plusieurs diodes électroluminescentes. Par exemple, il s'agit d'une lampe halogène, qui se trouve au foyer interne du réflecteur
• une lentille convergente L (qui peut être de type Fresnel), qui se trouve au second foyer du réflecteur.
• un cache C fixe, dont le bord optiquement actif BO est l'arrête du cache dans sa partie supérieure. Ce bord est ici choisi pour délimiter un faisceau de type code, avec une coupure oblique à 15° conforme aux réglementations européennes.
• un élément optique additionnel EO est disposé entre le réflecteur R et le cache C. C'est un élément sous forme d'une plaque dont le bord avant Bav est accolé au bord optiquement actif du cache, et qui est sensiblement plan (avec différentes variantes décrites plus loin) : il présente une face tournée vers le haut qui est réfléchissante. Cet élément est fixé mécaniquement au cache, ou peut en faire partie intégrante. Le cache et l'élément optique sont tous deux en métal. Ils peuvent aussi être en matériau à base de polymère sous réserve qu'il soit choisi suffisamment résistant à la chaleur et qu'on puisse métalliser l'élément optique sur une de ses faces au moins pour le rendre réfléchissant. On appellera également cet élément par le terme de « plieuse » dans tout le présent texte.

The figures 1 and 2 show the different main elements constituting the optical module M according to the invention. The latter includes:

• a reflector R whose geometric shape of the reflecting wall facing towards the front is close to a half ellipsoid. The figure shows a truncated reflector in its lower part. An alternative is to use a "complete" reflector, whose shape would be close to a complete ellipsoid.
• a light source S not shown, arranged at the bottom of the reflector R in a known manner. It may be a halogen lamp, a xenon lamp, or one or more light-emitting diodes. For example, it is a halogen lamp, which is located at the internal focus of the reflector
• a convergent lens L (which may be of Fresnel type), which is at the second focus of the reflector.
• a fixed C cache, whose optically active edge BO is the edge of the cache in its upper part. This edge is chosen here to delimit a code-type beam, with an oblique cut at 15 ° in accordance with European regulations.
• an additional optical element EO is disposed between the reflector R and the cover C. It is a plate-like element whose front edge Bav is attached to the optically active edge of the cover, and which is substantially plane (with different variants described later): it has an upwardly facing side which is reflective. This element is mechanically fixed to the cache, or can be an integral part of it. The cover and the optical element are both metal. They may also be made of polymer-based material provided that it is chosen to be sufficiently heat-resistant and that the optical element can be metallized on one of its faces at least to make it reflective. This element will also be called the term "folding" throughout this text.

The interest of this element is more particularly illustrated in figure 1 : if we take a ray r1 emitted by the source and reflected in the upper part of the reflector, we see that this ray passes over the cover to reach the lens. This ray will participate in the overall beam emitted by the module. The radius r2 emitted by the source, it is reflected by a slightly lower zone of the reflector, and it will, in the absence of the element EO, be stopped by the screen: the luminous flux of this ray is so lost. On the other hand, if this element EO is provided, the r2 rays reaches the reflecting face of the optical element EP and will be deflected in the form of a radius r2 'upwards, above the screen: by folding so up at least a portion of the rays that would otherwise be intercepted by the screen, the light output of the module is significantly improved.

• selon la variante de la figure 3a, l'élément optique est une plaque dont le bord avant Bav adopte le profil en ligne brisée du bord actif du cache C, et dont le bord arrière Bar est identique et aligné avec le bord avant Bav : on a donc un élément sous forme d'une succession de plans inclinés les uns par rapport aux autres et alignés sensiblement selon l'axe optique X du module. On peut moduler la profondeur p et la longueur I de cet élément pour ajuster au mieux les caractéristiques des rayons ainsi « récupérés » dans le faisceau émis par le module.
• selon la variante de la figure 3b, l'élément optique a un profil qui ressemble à celui de la figure 3a, mais ont été ajoutées des stries sur la face réfléchissante. Ces stries sont évolutives,dans la mesure où le bord avant Bav de l'élément se conforme toujours au profil en ligne brisée du cache, les stries ST naissant du bord avant puis évoluent de telle manière que le bord arrière Bar de l'élément optique ait un profil en stries. Ces stries peuvent être concaves ou convexes. Au niveau du bord arrière Bar, elles peuvent avoir une amplitude de 0.2 à 1 mm et un pas de 0.5 à 1.5mm. On peut avoir aussi, alternativement ou cumulativement à la présence de stries, la présence d'ondulations.
• selon la variante de la figure 3c, on retrouve la configuration à stries de la figure 3b, mais ici l'élément optique présente une échancrure, avec deux appendices latéraux A1,A2 également striés dans la continuité du reste de la face réfléchissante, et qui viennent entourer la source S, de façon à augmenter encore la récupération des rayons perdus. Les dimensions de ces appendices A1,A2 sont variables, notamment en fonction du type et de l'emplacement de la source. On peut aussi remarquer de la figure 4 que la largeur de l'élément optique EP est inférieure à celle du bord actif du cache : l'élément EO est approximativement centré sur la partie médiane du cache. Il pourrait être plus large, mais le gain supplémentaire en terme de flux n'est pas très important : il est surtout judicieux de prévoir une telle « plieuse » dans la zone du cache où le flux arrivant est le plus important.
  Les figures 4a, 4B, 4c sont des courbes isolux dans une représentation connue des opticiens (mesure à 25 mètres)
• la figure 4a correspond aux isolux qu'on obtient avec le module à cache sans l'élément optique selon l'invention de la figure 3b (la variante striée)
• la figure 4b correspond aux isolux qu'on obtient avec le module à cache avec l'élément optique selon l'invention, en isolant les rayons ajoutés dans le faisceau du fait de la présence de cet élément optique
• la figure 4c correspond aux isolux du module complet avec l'élément optique

The Figures 3a, 3b and 3c propose alternative embodiments of this optical element EO:

• according to the variant of the figure 3a , the optical element is a plate whose front edge Bav adopts the broken line profile of the active edge of the cover C, and whose rear edge Bar is identical and aligned with the front edge Bav: there is therefore an element in the form of a succession of planes inclined relative to each other and aligned substantially along the optical axis X of the module. We can modulate the depth p and the length I of this element to better adjust the characteristics of the rays thus "recovered" in the beam emitted by the module.
• according to the variant of the figure 3b , the optical element has a profile that resembles that of the figure 3a but have been added streaks on the reflective side. These streaks are evolutionary, insofar as the element's front edge Bav always conforms to the broken line profile of the cache, the striations ST arising from the front edge and then evolve in such a way that the rear edge Bar of the optical element has a striated profile. These streaks may be concave or convex. At the rear edge Bar, they can have an amplitude of 0.2 to 1 mm and a step of 0.5 to 1.5mm. We can have, too, alternatively or cumulatively with the presence of streaks, the presence of undulations.
• according to the variant of the figure 3c , we find the streak configuration of the figure 3b , but here the optical element has an indentation, with two lateral appendices A1, A2 also striated in continuity with the rest of the reflecting face, and which surround the source S, so as to further increase the recovery of lost rays. The dimensions of these appendices A1, A2 are variable, in particular depending on the type and location of the source. We can also notice the figure 4 that the width of the optical element EP is less than that of the active edge of the mask: the element EO is approximately centered on the middle part of the mask. It could be wider, but the additional gain in terms of flow is not very important: it is especially advisable to provide such a "folder" in the cache area where the incoming flow is the most important.
  The Figures 4a, 4b, 4c are isolux curves in a known representation of opticians (measured at 25 meters)
• the figure 4a corresponds to the isolux obtained with the cache module without the optical element according to the invention of the figure 3b (the striated variant)
• the figure 4b corresponds to the isolux obtained with the cache module with the optical element according to the invention, by isolating the added rays in the beam due to the presence of this optical element
• the figure 4c corresponds to the isolux of the complete module with the optical element

It can be deduced from these three figures that the invention makes it possible to add luminous flux in the central part of the beam: by adding the "corrugated folder" according to the figure 3b as an indication, a total flux of about 712 lumens to a total flux of about 870 lumens is increased from a maximum of about 46 lux to a maximum of about 72 lux.

We can thus evaluate a gain in light output of at least 10 up to 25% thanks to the presence of a "folding machine" according to the invention, all things being equal. And we can significantly increase the scope of the beam also (maximum increased by at least 20%).

It is also possible to modify the shape of the overall beam by the "bending machine", in particular to spread it out by appropriately selecting the distribution of striations or corrugations on the surface of the folder.

The positive effect of the folder is present regardless of the form of the cut (code, motorway ..) and it can adapt whatever the shape of the screen (which can be mono or multi component).

The invention can be applied mutadis mutandis to elliptical modules having a cache that is movable: in this case it is necessary to provide a motor for actuating, preferably integrally, the cache and the folder.

The folder can also be detached from the cache.

Claims (18)

1. Optical module (M), in particular an elliptical module, for a motor vehicle lighting device, which can emit at least one type of light beam which has a cut-off, and comprising:

   - a source of light (S) which is disposed in a reflector (R);

   - a dioptric element (L), in particular a converging lens, which is disposed to the front of the reflector (R);

   - a mask (C) which is disposed between the said source of light (S) and the said dioptric element (L), and has at least one optically active position in which it intercepts part of the rays of light emitted by the source (S), and effectively shuts off part of the beam of light such that the module emits a cut-off beam, the optically active edge of the mask (C) being able for form a cut-off in the beam emitted by the module (M);

   characterised in that an additional optical element (EO) is disposed completely between the source of light (S) and the mask (C), the said additional optical element being in the vicinity of the optically active edge of the mask (C), and having at least one reflective surface (R1) which can redirect above the optically active edge of the mask rays of light emitted by the source (S) in the direction of the said mask (C).
2. Module (M) according to the preceding claim, characterised in that the source (S) is placed at a first, internal focal point (Fi) of the reflector (R), or in the vicinity of the latter, and in that the dioptric element (L) is placed at the external focal point (Fe) of the reflector (R), or in the vicinity of the latter.
3. Module (M) according to one of the preceding claims, characterised in that the reflector (R) has a form which approximates that of an ellipsoid.
4. Module (M) according to one of the preceding claims, characterised in that the additional optical element (EO) is joined to, or forms an integral part of the mask (C).
5. Module (M) according to one of the preceding claims, characterised in that the reflective surface (R1) of the additional optical element (EO) comprises a surface (Fa) which faces upwards, the front edge (Bav) of which follows substantially, at least locally, the profile of the optically active edge of the mask (C).
6. Module (M) according to the preceding claim, characterised in that the front edge (B1) of the additional optical element (EO) is adjacent to the optically active edge of the mask (C).
7. Module (M) according to one of the preceding claims, characterised in that the reflective surface (R1) of the additional optical element (EO) comprises a surface (Fa) which faces upwards and is disposed in the vicinity of the central part only of the mask (C).
8. Module (M) according to one of the preceding claims, characterised in that the reflective surface (R1) of the additional optical element (EO) comprises a surface (Fa) which faces upwards and is provided with a cut-out at the level of its rear edge (Bar).
9. Module (M) according to any one of claims 5 to 8, characterised in that the front edge (Bav) comprises a broken line.
10. Module (M) according to any one of claims 5 to 9, characterised in that the front edge (Bav) acts substantially as a generatrix for the form of the surface (Fa).
11. Module (M) according to one of the preceding claims, characterised in that the reflective surface (R1) of the additional optical element (EO) comprises a surface (Fa) which faces upwards, the rear edge (Bar) of which has a profile which approximates, or is identical to, or different from that of the front edge (Bav).
12. Module (M) according to one of the preceding claims, characterised in that the reflective surface (R1) of the additional optical element (EO) comprises a surface (Fa) which faces upwards and comprises a skewed surface.
13. Module (M) according to one of the preceding claims, characterised in that the reflective surface (R1) of the additional optical element (EO) comprises a surface (Fa) which faces upwards that is smooth, or which comprises, at least locally, serrations (ST) and/or undulations (O).
14. Module (M) according the preceding claim, characterised in that the serrations (ST) and/or undulations (O) are substantially oriented parallel to the optical axis (X) of the module.
15. Module (M) according to claim 13 or 14, characterised in that the serrations (ST) and/or undulations (O) have an evolutive form.
16. Module (M) according to one of the preceding claims, characterised in that the reflector (R) is truncated in its lower part.
17. Optical module (M) according to at least one of the preceding claims, characterised in that the mask (C) is a mobile mask which makes it possible to provide a bi-functional or multi-functional headlight, and in particular a bi-functional dipped / full-beam module or a multi-functional module.
18. Motor vehicle headlight equipped with an optical module (M) according to at least one of the preceding claims.

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