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    • 专利摘要:
    The present invention relates to a vehicle light module (1), intended to generate a light beam along an optical axis (I), comprising: - primary light guides (2) each comprising an input diopter and an output; - a light source (9) arranged opposite an input diopter; - a projection assembly (4) comprising a focal zone and an output member (61), said projection assembly (4) being arranged so that the light rays passing through said focal zone and reaching the output member (61) are imaged in a projection field downstream of said projection assembly; - the outputs of the guides being arranged at the focal zone. According to the invention, the light module (1) comprises at least one secondary light guide (3) separate from the primary light guides (2), and arranged so as to deflect light rays coming from the light source (9) of so that they do not reach the output member (61), and / or so as to spread said light rays in said projection field.
    公开号:FR3087875A1
    申请号:FR1859869
    申请日:2018-10-25
    公开日:2020-05-01
    发明作者:Orane MARCHAL
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    [0001] The present invention relates to the field of lighting for a motor vehicle.
    More particularly, the present invention relates to a light module arranged so as to reduce parasitic light rays and / or to prevent the formation of the image of said parasitic rays.
    In known manner, there are light modules capable of generating a pixelated beam, the projection of which forms an image composed of illumination units, also called “pixels” in English.
    Said units are organized in at least one horizontal and / or vertical row and each of the illumination units can be selectively activated.
    Such an optical module is used for example in addition to a second optical module capable of generating a main lighting and / or signaling beam to form a lighting and / or signaling beam integrating one or more adaptive functions.
    Alternatively, the optical module capable of generating a pixelated beam is designed so as to produce on its own a lighting and / or signaling beam.
    The adaptive functions are grouped under the name AFS, the abbreviation for "Advanced Front System" in English.
    By way of example, in the case of a low beam, the pixelated beam is illuminated with a lower portion of the low beam to perform an additional lighting function, namely a turn tracking function, called LED. “Dynamic Bending Light” in English.
    This function allows lighting towards the inside of the bend that the vehicle is taking or about to take.
    In another application, the pixelated beam is illuminated 130 with a portion of the driving beam in order to perform an adaptive road function, called ADB, for “Adaptive Driving Beam” in English, the aim of which is to offer better visibility to the driver of the vehicle. while avoiding dazzling the driver of an oncoming vehicle.
    In a simplified manner, the optical module capable of generating a pixelated beam comprises a plurality of elementary light sources which can be selectively activated and united in a matrix of elementary light sources, a plurality of light guides placed in front of said matrix, and an optical assembly. projection imaging the output of the light guides.
    However, it has been found that certain configurations of the light module cause the presence of parasitic light rays.
    The light guides are generally arranged in parallel directions.
    Alternatively, the light guides can be distributed in a fan or in a semi-circle, each of the optical axes of the light guides being oriented towards the optical axis of the module.
    Whatever the arrangement of the optical guides, the latter each comprise an input diopter and an output.
    The elementary light sources can be light-emitting diodes, also commonly called LEDs (the most common name and derived from the English for “Light Emitting Diode”).
    The light sources are placed opposite the input diopters of all or part of the light guides.
    In other words, depending on the shape of the desired light beam, the number of light sources may be less than the number of light guides.
    In the case where the light sources are LEDs, it sometimes happens that the solid angle of the beam emitted by at least one of the LEDs intercepts a surface larger than the surface of the input diopter situated opposite.
    Consequently, a minority of light rays are not collected by said entry diopter and propagate laterally, then enter by refraction into other light guides which are not intended for them.
    These light rays then propagate inside these guides in the direction of the projection optics assembly.
    The parasitic rays are recognized on the image projected by the optical module, here a light beam comprising a main beam performing the desired optical function.
    Indeed, the parasitic rays are identified in the form of light overcurrents in the main beam or light spots outside the main beam.
    The presence of light overcurrents or light spots degrades the quality of the beam.
    The technical problem which the invention aims to solve is therefore to provide a pixelated beam with better lighting quality.
    To this end, a first object of the invention is a vehicle light module, intended to generate a light beam along an optical axis, comprising: primary light guides each comprising an input diopter and an output; a light source arranged opposite an input diopter; a projection assembly comprising a focal zone and an output member, said protection assembly being arranged so that the light rays passing through said focal zone and reaching the output member are imaged in a projection field downstream of said projection set; the outputs of the guides being arranged at the focal zone.
    According to the invention, the light module comprises a secondary light guide separate from the primary light guides, and arranged so as to deflect light rays coming from the light source so that they do not reach the body of the light. output, and / or so as to spread said light rays in said projection field.
    In the context of the invention, by “at” is meant a location which includes “exactly on” or “slightly beside” but sufficiently close to form an image of these guide outputs.
    Here, when the outputs of the guides are located at the level of the focal zone, said outputs are placed slightly beside or exactly on the focal zone so as to be imaged by the projection assembly of the light module.
    Here, by focal zone is meant a surface of better object foci.
    This is the surface disposed closest to a set of object focus points.
    4 In addition, the term “projection field” is understood to mean the entire space in which the projection system projects the image.
    The output member may be the output diopter of the most downstream optical part of the projection system, or an end optical part.
    For example, if this end optical part is a lens, in particular a secondary lens, the output member is the output diopter of this lens.
    If this end optical part is a reflector, the output member is the reflecting surface of this reflector.
    0 The rays deflected by the secondary light guide (s) therefore do not reach the output member, in particular they can be stopped during their journey by an absorbent surface towards which the secondary guide (s) deflect them or else be deflected. by the secondary guide (s) so as to follow a path, direct or indirect, which passes away from the output member.
    Thus, thanks to the secondary light guide (s), the deflected light rays are not imaged on the projection field.
    Thus, the deflected rays are therefore not projected, and do not appear in the projection field.
    Deflected rays are parasitic rays propagating in guides which are not intended for them.
    Alternatively or in a complementary manner, the secondary light guide (s) reflect stray light rays so that they arrive at the focal zone being widely spaced from each other.
    In fact, on leaving the secondary light guide (s), this beam of parasitic rays is exploded so that the parasitic rays are divergent and widely spaced from one another when they arrive at the focal zone.
    Consequently, the image of these stray rays is spread out in the projection field, which considerably decreases the intensity of the image of the stray rays.
    Thus, by virtue of the secondary light guides, the risk of bringing a surplus of light intensity into the main beam and / or light spots outside the main beam is reduced.
    The light module according to the invention therefore generates a light beam of good quality, sharp and precise.
    Furthermore, the light module according to the invention makes it possible to reduce the risk of dazzling a driver coming from the front.
    The light module according to the invention can optionally have one or more of the following characteristics: the light module comprises several secondary light guides; the light module is arranged so that the image of the outputs of the primary guides associated with the light source forms a light band in the projection field, said light band 0 forming a portion of an illumination beam; by way of example, the light strip forms a portion of an illumination beam containing several illumination units, or pixels, which can be switched off or switched on selectively and independently of one another; in one example, said portion is called the first lighting beam portion; furthermore, the light module according to the invention can be designed so as to generate a second portion of the lighting beam complementary to the first portion in order to produce a complete lighting beam, a part of which can be switched off or illuminated independently of the light. 'other part; alternatively, the light module according to the invention can be switched on in conjunction with other light modules to produce a lighting beam; thanks to the quality of the light module according to the invention, the complete lighting beam 25 also has an improved quality, which provides better visibility to the driver; the primary light guides and the secondary light guide (s) are arranged in the same horizontal row; the or at least one of the secondary light guides, called the first secondary light guide, is placed between two primary light guides; the first secondary light guide, thus placed, can receive the parasitic light rays coming from its two sides, in particular coming from the primary light guide located on the left and / or the primary light guide located on the right; the primary light guides and the secondary light guide (s) are arranged in the same horizontal row; the or at least one of the secondary light guides, said second secondary light guide, is placed at one end of said horizontal row; thus, the second secondary light guide can intercept the parasitic light rays which escape laterally towards the sides of the light module; at least one secondary light guide extends 1 longitudinally along a first axis substantially parallel to the optical axis of the module; at least one secondary light guide comprises side faces slightly curved inward towards the first axis; thus, the curved side faces participate in refracting parasitic rays entering inside the secondary guide (s) so as to deflect the path of these parasitic rays and / or to spread the image of these rays over the projection field; at least one secondary light guide comprises two opposite and concave lateral faces, seen from the outside of said first guide; this is a simple and efficient embodiment of the secondary light guides; at least one secondary light guide comprises planar side faces; thus, the flat faces of the secondary guide 25 return the parasitic rays to the side from which they originate, instead of allowing the parasitic rays to continue to propagate, in order to reach the focal zone of the projection assembly; alternatively, it is possible to have a combination of the side faces of different shapes on the same secondary guide; for example, a secondary guide comprises a planar side face and a concave side face, or a planar side face and a convex side face, or a concave side face and a convex side face; at least one secondary light guide comprises a first entry comprising a free end arranged substantially in the same plane as at least some entry diopters of the primary light guides; the secondary light guide, thus designed, can be molded at the same time as the primary light guides without the need for a release drawer specific to said secondary light guide; this therefore simplifies the method of manufacturing the optical module; at least one secondary light guide comprises a free end arranged offset longitudinally with respect to at least some of the input diopters of the primary light guides; in some configuration of the optical module, the secondary guide (s) do not receive parasitic light rays to be deflected or to be spread in the portion situated slightly in front of or at the same level of the input diopters of the primary light guides; consequently, it would therefore be unnecessary to extend it or them to the same level as said input diopters; the secondary guide (s) are therefore shorter and consume less material for their manufacture; the light module comprising the short secondary guide (s) is less heavy and therefore costs less; 20 according to the previous paragraph and alternatively, the secondary guide (s) are longer than the primary guides; in this case, the free end of the secondary guide (s) can be used as a positioning and / or fixing member to position all of the guides relative to a support 25 and / or to fix all of the guides to said support; the projection assembly comprises a primary lens and a secondary lens disposed at a distance and downstream from said primary lens, the primary lens receiving the rays leaving the outputs of the primary light guides and the rays leaving the output of the secondary light guide or exiting or exiting the outputs of the secondary light guides and sending them to the secondary lens; in other words, the primary lens and the secondary lens forming the projection assembly converging at the focal zone; alternatively, the projection assembly can comprise more than two lenses; the primary lens, the primary light guides and the secondary light guide (s) are integrally formed so as to form a one-piece optical part; thus, this makes it possible to reduce the number of distinct components of the light module and to simplify the assembly of said module as well as the robustness to positioning tolerances; the projection assembly is composed of a single lens converging at the focal zone so as to image the outputs of the primary light guides; the projection assembly, the primary light guides and the secondary light guide (s) are integral in one piece; thus, the light module comprises a multifunctional monobloc optical part, compact and easy to assemble; the light module comprises several light sources, said light sources being arranged opposite the input diopters of all or part of the primary light guides; thus, the light module can be adapted according to the requirements of the specifications.
    The subject of the invention is also a lighting device comprising a light module according to the invention.
    In this document, unless otherwise indicated, the terms “upstream” and “downstream” refer to the direction of propagation of light in the object to which they refer and also to the direction of emission of light outside said object.
    On the other hand, everything referred to as "front" is on the downstream side while everything referred to as "rear" is on the upstream side.
    The terms "horizontal", "vertical" or "transverse", "lower", "upper", "top", "bottom", "side" are defined in relation to the orientation of the light module or a part forming part of the light module according to the invention in which it is intended to be mounted in the vehicle.
    In particular, in this application, the term “vertical” denotes an orientation perpendicular to the horizon while the term “horizontal” denotes an orientation parallel to the horizon.
    Other characteristics and advantages of the invention will become apparent on reading the detailed description of the non-limiting examples which follow, for the understanding of which reference is made to the appended drawings, among which: FIG. 1 illustrates a perspective view according to a direction from upstream to downstream of a light module according to an exemplary embodiment of the invention; FIG. 2 illustrates a top view of an optical part comprising light guides and a primary lens, said optical part forming part of the light module of FIG. 1; FIG. 3 illustrates a schematic view of a horizontal section of the optical part of FIG. 2; FIG. 4 illustrates a perspective view in a direction from upstream to downstream of the optical part of FIG. 2; FIG. 5 illustrates a rear part of an optical part of the state of the art, similar to the optical part of FIG. 2, but comprising only primary light guides; FIG. 5 also illustrates, schematically, traces of light rays emitted by two elementary light sources; FIG. 5A illustrates the image comprising a light strip generated by a light module comprising the optical part of FIG. 5, as well as a first image zone of parasitic light rays; said image is in the form of isolux curves projected onto a vertical screen, in particular at a distance of 25 meters in front of a light module carrying the optical part 25 of FIG. 5; FIG. 5B illustrates the same image with the light bands as in FIG. 5A and showing a second image zone of the parasitic light rays; FIG. 6 illustrates a rear part of the optical part of FIG. 2 as well as the light beams emitted by two elementary light sources; FIG. 6A illustrates the image comprising a light strip generated by the light module of FIG. 1, namely the light module comprising the optical part of FIG. 2, as well as a first image zone of parasitic light rays; said image is in the form of isolux curves projected onto a vertical screen 0, in particular at a distance of 25 meters in front of the light module of FIG. 1; FIG. 6B illustrates the same image with the light bands as in FIG. 6B and showing a second image zone of the parasitic light rays.
    With reference to FIG. 1 and to FIG. 2, a light module 1 according to an exemplary embodiment of the invention is intended to generate a light beam in the direction of an optical axis I.
    The light module 1 comprises a plurality 10 of light guides, a primary lens 5 and a secondary lens 6.
    10 light guides fall into two categories, including 2 primary light guides and 3 secondary light guides.
    The primary light guides 2 are intended to shape a light beam emitted by at least one light source into a light brush when exiting these primary light guides 2.
    Each primary light guide 2 comprises an input diopter 20 and an output 29.
    In the example illustrated, a light source 9, in particular a light-emitting diode 9, is placed in front of each input diopter 20 20.
    So here the number of diodes equals the number of primary light guides.
    In another example, the number of diodes may be less than the number of primary light guides.
    The secondary light guides 3 are designed to refract and deflect light rays, however, only stray light rays.
    The term “parasitic light rays” is understood to mean rays coming from a light source arranged upstream of a primary light guide 2, but which do not enter said primary light guide 2, or which exit via one of the front side faces. to have reached the exit of this primary guide 2.
    The secondary light guides 3 each include an outlet 39 and a free end 30.
    These secondary light guides 3 will be described in detail later in the description.
    In the remainder of the description, in order to facilitate reading, the terms “primary light guides”, “secondary light guides”, “stray light rays”, “light beam” 11 are called respectively “primary guides”, “ secondary guides ”,“ parasitic rays ”and“ beam ”.
    In the example illustrated, the primary lens 5 is a biconvex lens comprising, here, at the front, a main downstream face 51 and, here, at the rear, a main upstream face 52.
    The set of secondary and primary light guides protrudes upstream from this main upstream face 52.
    The secondary lens 6 is placed at a distance and downstream from the primary lens 5 so as to receive the rays exiting from the main downstream face 51 of said primary lens 5.
    The secondary lens 6 has here, at the front, a secondary downstream face 61, and at the rear, a secondary upstream face 62.
    In Figure 1, the secondary upstream face 62 is shown flat, but it may be slightly convex, seen from the outside of the lens 6.
    The primary lens 5 and the secondary lens 6 are arranged so as to form a projection assembly 4 having a focal zone F at the level of, or even matching, the main upstream face 52 of the primary lens 5.
    In this way, the light rays leaving the primary and / or secondary guides are imaged by the projection assembly 4 while minimizing optical field aberrations.
    Referring to Figure 2, six light guides, including four primary guides 2 and two secondary guides 3, are illustrated.
    All guides are arranged in a horizontal row 11.
    Three primary guides 2 are placed side by side and are called respectively, in order from left to right of Figure 2, the first, second, and third primary guide 21, 22 and 23.
    The fourth primary guide 24 is placed at a right end 110 of the horizontal row 11.
    Each of the primary guides 2 comprises an input diopter 20 and an output 29 ..
    An elementary light source 9, here a light-emitting diode or LED, is placed in front of each input diopter 20.
    A first secondary guide 31 is placed between the third and the fourth primary guide, 23 and 24.
    A second secondary guide 32 is placed at a left end 111 of the horizontal row 11.
    Each of the secondary guides 3 comprises here, at the front, an outlet 39, and here, at the rear, a free end 30.
    As described above, the outlets of the primary and secondary guides 20 and 30 are arranged on the main upstream face 52 of the primary lens 5.
    The projection assembly 4 is configured so that the focal zone F passes through this main upstream face 52 of the primary lens 5 to project towards infinity any ray exiting the primary and secondary guides 2 and 3 via their exit 29 , 39.
    Therefore, the primary lens 5 receives the rays coming out of the outputs of the primary guides 2 and the rays coming out of the secondary guides 3.
    The primary lens 5 then sends them to the secondary lens 6.
    Here, the focal zone F has a curved surface passing through the outputs 29 of the primary guides 2 and the outputs 39 of secondary guides 3.
    The focal zone F is illustrated in figure 3.
    In this example, the six light guides 21 to 24, 31, 32 and the primary lens 5 are formed as a single optical part 7 in one piece.
    This one-piece optical part 7 comprises lateral fins 71 each comprising a gripping foot 72.
    The latter is intended to be affixed to a support (not illustrated in the figures).
    The hooking feet 72 are fixed, in particular by screwing, to the support to maintain the position of the single-piece optical part 7 in the light module 1.
    In Figure 3, a horizontal section of the one-piece optical part 7 is shown.
    We therefore see the horizontal section of the primary 21 to 24 and secondary 31, 32 guides.
    In particular, the first secondary guide 31 extends longitudinally in parallel to the optical axis of the light module.
    The longitudinal axis of the first secondary guide 31 is called the first axis II 0.
    The first secondary guide 31 comprises two side faces 315 which are slightly curved inwards towards the first axis II.
    In other words, the side faces 315 of the first secondary guide 31 are the concave faces, seen from the outside of said first guide 31.
    In other words, the lateral faces 315 of the first secondary guide 31 are convex seen from the inside of the secondary guide 31, that is to say by considering the path of the light rays propagating inside said first secondary guide 31. .
    In this example, the free end 310 of the first secondary guide 31 is substantially coplanar with the entry diopters 20 of the primary guides 2.
    As for the second secondary guide 32, the latter comprises plane side faces 325.
    In addition, the free end 320 of the second secondary guide 32 is offset longitudinally downstream with respect to the input diopters 20 of the primary guides 1 2.
    Here, the length of the two secondary guides 3 and the shape of all their faces, in particular their side faces, are defined so as to intercept and deflect the rays creating the stray light.
    We could therefore have a different shape than that shown in the figures.
    In particular, the shapes which apply to the first secondary guide can also apply to the second secondary guide.
    Conversely, the shapes apply to the second secondary guide can also apply to the first secondary guide.
    Figure 4 shows the rear of the primary 2 and secondary 3 guides.
    Here, the primary guides 2 each have an upper face 27 slightly curved downwards.
    The entry diopter 20 of each of these guides 2 has, here, a curved surface slightly inclined with respect to the vertical.
    As regards the first secondary guide 31, in this example, the free end 310 of said first guide 31 is composed of several facets, here two in number, including an upper facet 311 and a lower facet 312.
    The lower facet 312 of the free end 310 is located substantially in the same plane as the entry diopters 20 of the primary guides 2.
    The lower facet 312 is therefore also slightly inclined with respect to the vertical.
    Unlike the first secondary guide 31, the free end 320 of the second secondary guide 32 comprises a single facet 321 and which is parallel to the vertical direction.
    The second secondary guide 32 therefore has the shape of a truncated pyramid 14 with the outlet similar to the large base and the free end the small base.
    FIGS. 5, 5A, 5E, 6, 6A and 6B described below further explain the operation and the technical advantage of the secondary guides 31, 32 in the light module 1 according to an exemplary embodiment of the invention compared to a light module without secondary guides.
    Referring to Figure 5, there is illustrated an optical part 8 similar to the optical part 7 shown in Figure 2 and Figure 6.
    However, the optical part S of FIG. 5, called the comparison optical part 8, does not include secondary guides.
    It only includes primary guides which are, on the other hand, the same number and in the same arrangement as those in Figure 2.
    The primary guides of the optical part 8 for comparison therefore bear the same references as those of the primary guides of the optical part 7 shown in FIG. 2 and in FIG. 6.
    Two elementary light sources, here two LEDs, are placed respectively in front of the second primary guide and the third primary guide.
    The LED 92 placed opposite the input diopter 220 of the second primary guide 22 is hereinafter called the second LED 92, while the LED 93 placed opposite the input diopter 230 of the third primary guide 23 is called the third LED 93.
    In FIG. 5, there is also illustrated the beams emitted by these two LEDs 92 and 93.
    Precisely, the second LED 92 emits a beam, a main part of which containing the majority of the rays of this beam propagates inside the second primary guide 22.
    This main part of the bundle is hereinafter called the second primary bundle 221.
    This second primary beam 221 propagates in the second primary guide 22 until it reaches the exit 229 of said guide 22, and then the focal zone F.
    The second primary beam 221 is thus imaged by the projection assembly 4.
    The image of the second primary beam 221 is an illumination unit 224 having a slightly rectangular shape.
    This illumination unit 224 is referred to as a second illumination unit 224 and is illustrated in Fig. 5A as well as in Fig. 5E.
    It will be noted that the image of the outputs of light guides 2, 3 is inverted with respect to their structural arrangement.
    Indeed, the image of the beams from the second primary guide 22 is located to the right in Figures 5A, 5B while the image of the beams from the third primary guide 23 is located to the left of Figures 5A, 513.
    However, structurally, the second primary guide 22 is located to the left of the third primary guide 23, with respect to the direction of emission of the light.
    Consequently, the image of the second primary beam 221, which here is the second illumination unit 224, is the unit located to the right of FIG. 5A and FIG. 5B.
    The beam emitted by the second LED 92 comprises yet another part of the beam, called the second secondary beam 222.
    Unlike the second primary beam 221, the second secondary beam 222 does not enter the second primary guide 22 and goes to the right with respect to the direction of emission of the light, which is, here, also the right of the figure 5.
    The second secondary beam 222 passes through the third primary guide 23 by refraction laterally.
    It then leaves the third primary guide 23 through the right side edge 235 thereof and is divided into two parts.
    A first part 227 of the second secondary beam 222 reaches the focal zone F.
    A second part 225 of the second secondary beam 222 enters by refraction into the fourth primary guide 24 before arriving at the focal zone F.
    Therefore, the first and the second part 227 and 225 of the second secondary beam 222 are also imaged by the projection assembly 4.
    The image of the first portion 227 of the second secondary beam 222 is shown in Figure 5E.
    This is a 28 light spot with an irregular shape.
    In other words, this task 28 forms a parasitic image on the image of the beam generated by the light module.
    In order to facilitate reading of the figures, a dotted arrow M is presented to show the correspondence between the second secondary beam 222, or more precisely, the first part 227 thereof, and its image on the screen - FIG. 5B.
    Task 28 is located, here, to the left of second and third illumination units 224, 234 in FIG. 5E.
    Likewise, the image of the second part 225 of the second secondary beam 222 will form a parasitic image on the image of the beam generated by the light module.
    Thus, the second secondary beam 222 is a beam of parasitic light rays.
    The same phenomenon occurs with the third primary light guide 23 and the third LED 93.
    1 As illustrated in FIG. 5, the third LED 93 emits a beam, a main part of which containing the majority of the rays of the beam propagates all along the third primary guide 23 to then reach the exit 239, then be projected downstream by the projection set 4.
    This main part of this beam is hereinafter called the third primary beam 231.
    The image of the third primary beam 231 is an illumination unit 234 located to the left in Figures 5A and 5B.
    This unit is also called the third unit of illumination 234.
    The latter has a shape similar to the second illumination unit 224, namely a substantially rectangular shape.
    Thus, the second illumination unit 224 and the third illumination unit 234, arranged side by side, form part of a light strip which the light module 1 is able to generate.
    The light strip can be lit in addition to other basic light portions to form a lighting and / or signaling beam.
    The beam emitted by the third LED 93 also comprises another part of the beam, also called the third secondary beam 232.
    This leaves outside the third primary guide 231 and to the left.
    The third secondary beam 232 enters the second primary guide 22 and crosses the latter transversely.
    It then leaves the second primary guide 22 via its left lateral edge 226, also passes through the first primary guide 21 by refraction, and then goes towards the focal zone F.
    The third secondary beam 232 is therefore imaged by the projection assembly 4.
    Its image is shown in Figure 1 7 5A.
    This is a task 29 having an irregular shape, located on the right side of the second and third illumination units 224 and 234 in Figure 5A.
    For ease of identification, an arrow N presented to show the correspondence between the third secondary beam 232 and its image on screen - Figure 5A.
    The third secondary beam 232 is also considered to be a beam of parasitic light rays.
    The presence of the light spots 28 and 29 coming from the second secondary beam 222 and from the third secondary beam 232 is detrimental to the quality of the beam generated by the light module carrying this optical part 8.
    Indeed, these tasks 28 and 29 can provide a surplus of light intensity of the illumination units specific to neighboring guides, that is to say units which are generated by guides located on either side of the second primary guide 22 and / or the third primary guide 23.
    Thus, the value of the light intensity, measured at the place where there is the superposition of these spots 28 and 29 with the illumination unit, generates visual discomfort.
    Furthermore, these light spots 28, 29 prevent the total extinction of the illumination units formed by the neighboring light guides.
    In fact, when the light sources arranged opposite the neighboring guides are turned off, the corresponding illumination units are also turned off.
    However, if the second and third LEDs 92 and 93 remain on, the stray ray beams 222, 232 persist.
    Thus, the light spots 28, 29 remain on at the location of the illumination units of the neighboring guides which are however off.
    In addition, these light spots 28, 29 can be located in an area where it is not desired to have light, in particular where another vehicle is being followed or coming in the opposite direction.
    There can therefore be residual light which can be dazzling for a driver coming in front or for the vehicle being followed.
    In view of these harmful effects caused by parasitic rays, the applicant proposes a light module 1 as illustrated in FIGS. 1 to 4 and 6 and described above.
    Of course, this is one embodiment among many other possible while remaining within the scope of the invention.
    FIGS. 6, 6A and 6B described below make it possible to better understand the operation and the advantage of the light module according to the invention described above.
    Compared to the optical part 8 of FIG. 5, the optical part 7 of FIG. 6 additionally comprises the first secondary guide 31 and the second secondary guide 32.
    The optical part 7 of FIG. 6 still comprises the second and third LEDs 92 and 93, the same primary guides 21 to 24 as those of FIG. 5.
    The second and third primary guides 22 and 23 also respectively form the second and third illumination units 224 and 234.
    As in the previous case, the second illumination unit 224 is on the right in Figures 6A and 6B while the third illumination unit 234 is on the left in the same figures.
    As regards the first secondary guide 31, the latter receives light rays leaving from the second LED 92 to the right with respect to the direction of emission of the light, which is, here, also the right of FIG. 6.
    Precisely, the first 25 secondary guide 31 receives, here, the second secondary beam 222 emitted by the second LED 92.
    The side faces 315 of the first secondary guide 31 are curved to increase the effect of deflection of the spokes.
    Inside the first secondary guide 31, the rays of the second secondary beam 222 carry out multiple reflections so that, on leaving said first guide 31, the rays are multidirectional and therefore do not form a collimated beam.
    Consequently, the image of the light rays exiting from the first secondary guide 31 is spread in the image of the beam obtained on the screen.
    Where the task 28 appeared in FIG. 5B, now only a small task 41 appears at reduced intensity.
    Thus, the first secondary guide 31 reduces the concentration of stray light.
    As regards the second secondary guide 32, this receives parasitic rays which propagate to the left with respect to the direction of emission of the light, which is, here, also the left of FIG. 6.
    Here, the second secondary guide 32 receives rays emitted by the third LED 93, or precisely the rays of the third secondary beam 232.
    The rays of said third secondary beam 232 are reflected inside the second secondary guide 32 so as to form different parts of rays listed below.
    A first part 326 of these rays is returned to the side from which they originate, that is to say to the third primary guide 23.
    A second other part 327 of these rays, as shown by the line K in FIG. 6, is moved away from the place where they previously impacted the focal zone F, eccentric and deflected outwards from the secondary lens 6.
    Thus, they are transmitted by the primary lens 5 but do not reach the secondary upstream face 20 62 of the secondary lens 6.
    Indeed, the secondary downstream face 61 forms the outlet member.
    One zone allowing the rays to reach it is the space immediately before the secondary downstream face 61.
    Another zone making it possible to reach the secondary downstream face 61 is the passage 25 via the secondary upstream face 62.
    Here, the second part 327 of the parasitic rays are deflected next to the secondary upstream face 62.
    Thus, the rays of said part 327 do not enter the secondary lens 6, they are therefore not imaged in the projection field of the projection assembly 4.
    A third part 328 of the rays effect a multitude of reflections in the second secondary guide 32 so that their image is displayed on the screen.
    In the end, there are very few rays coming out of the second secondary guide 32 which can be imaged by the projection assembly 4 so as to produce an image of sufficient intensity to be detectable on the screen.
    The minority of the imaged rays 20 form very small spots 42 at low intensity on the screen.
    These tasks are shown in Figure 6A.
    The second secondary guide 32 therefore limits or prevents the formation of notable parasitic images in the image of the beam generated by the light module 1.
    Thus, thanks to the first and second secondary guides 31 and 32, the light module 1 according to the invention and according to the example described above generates a light beam having very slight parasitic images, or even a light beam free of parasitic images. .
    The light beam generated by such a light module therefore has improved quality, this mistletoe provides better visibility to the driver.
    Of course, it is possible to make numerous modifications to the invention without departing from the scope thereof.
    In a module, it is possible to have only one or more secondary guide (s) on one edge or only one or more secondary guide (s) between 2 primary guides or Ufl OR several secondary guide (s) ) of each type.
    The side faces of the secondary guides can be plane, concave or convex depending on the desired deviations, whether they are at the end or between the primary guides.
    The free edges of the secondary guides may be at least in part coplanar with the entry surfaces of the primary guides or have different shapes.
    Secondary guides may be longer or shorter than primary guides, which they
    权利要求:
    Claims (14)
    [0001]
    CLAIMS 1. Vehicle light module (1), intended to generate a light beam along an optical axis (I), comprising: primary light guides (2, 21, 22, 23, 24) each comprising an input lens (20, 220, 230) and an outlet (29); a light source (9, 92, 93) arranged opposite an input diopter (20, 220, 230); a projection assembly (4, 5,6) comprising a focal zone (F) and an output member (61), said projection assembly being arranged so that the light rays passing through said focal zone (F) and reaching the output member are imaged in a projection field downstream of said projection assembly; the outputs (29, 39) of the guides being arranged at the focal zone (F), said light module (1) being characterized in that it comprises at least one secondary light guide (3, 31, 32) distinct from the primary light guides (2, 21, 22, 23, 24), and arranged so as to deflect light rays coming from the light source so that they do not reach the output member (61), and / or so as to spread said light rays in said projection field.
    [0002]
    2. Light module (1) according to claim 1, characterized in that it is arranged so that the image of the outputs of the primary guides (2, 21, 22, 23, 24) associated with the light source ( 9, 92, 93) forms a light strip in the projection field, said light strip forming a portion of an illumination beam.
    [0003]
    3. Light module (1) according to claim 1 or according to claim 2, characterized in that the primary light guides (2, 21, 22, 23, 24) and the secondary light guide (s) (3, 31, 32) are arranged in the same horizontal row (11), in that the or at least one of the secondary light guides (31), called the first secondary light guide (31), is placed between two primary light guides (23) , 24).
    [0004]
    4. Light module (1) according to any one of the preceding claims, characterized in that the primary light guides (2, 21, 22, 23, 24) and the secondary light guide or guides (3, 31, 32 ) are arranged in the same horizontal row (11), in that the or at least one of the secondary light guides (32), called second secondary light guide (32), is placed at one end (111) of said row horizontal (11).
    [0005]
    5. Light module (1) according to one of claims 1 to 4, characterized in that at least one secondary light guide (31) extends longitudinally along a first axis (I1) substantially parallel to the optical axis. (I) of the module, and in that said at least one secondary light guide (31) comprises side faces (315) slightly curved inward towards the first axis (II).
    [0006]
    6. Light module (1) according to one of the preceding claims, characterized in that at least one secondary light guide (31) comprises two side faces (315) opposite and concave, seen from the outside of said first guide.
    [0007]
    7. Light module (1) according to one of the preceding claims, characterized in that at least one secondary light guide (32) comprises lateral faces (325) planar.
    [0008]
    8. Light module (1) according to one of the preceding claims, characterized in that at least one secondary light guide (31) comprises a first inlet comprising a free end (310) arranged substantially in the same plane as minus some input diopters (20) of the primary light guides (2, 21, 22, 23, 24).
    [0009]
    9. Light module (1) according to one of the preceding claims, characterized in that at least one secondary light guide (32) comprises a free end (320) arranged offset longitudinally with respect to at least some 23 of the input diopters (20) of the primary light guides (2, 21, 22, 23, 24).
    [0010]
    10. Light module (1) according to any one of claims 1 to 9, characterized in that the projection assembly (4) comprises a primary lens (5) and a secondary lens (6) arranged at a distance and in downstream of said primary lens (5), the primary lens (5) receiving the rays leaving the outputs of the primary light guides (2, 21, 22, 23, 24) and the rays leaving the output of the secondary light guide or 10 exiting the outputs of the secondary light guides (3, 31, 32) and sending them to the secondary lens (6).
    [0011]
    11. Light module (1) according to the preceding claim, characterized in that the primary lens (5), the primary light guides (2, 21, 22, 23, 24) and the secondary light guide (s) (3). , 31, 32) are integrally formed so as to form an optical part (7) in one piece.
    [0012]
    12. Vehicle light module (1) according to any one of claims 1 to 9, characterized in that the projection assembly is composed of a single lens converging at the level of the focal zone so as to image the outputs. primary light guides, and in that the projection assembly, primary light guides and secondary light guides are integrally formed.
    [0013]
    13. Vehicle light module (1) according to any one of the preceding claims, characterized in that it comprises several light sources (9, 92, 93), said light sources (9, 92, 93) being arranged in vis-à-vis the input diopters (20) of all or part of the primary light guides (2, 21, 22, 23, 24).
    [0014]
    14. Vehicle lighting device, characterized in that it comprises a light module (1) according to any one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    CN113039387A|2021-06-25|
    US20210381669A1|2021-12-09|
    EP3870893A1|2021-09-01|
    WO2020083711A1|2020-04-30|
    JP2022512815A|2022-02-07|
    FR3087875B1|2021-07-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP2306073A2|2009-10-05|2011-04-06|Automotive Lighting Reutlingen GmbH|Light module for a lighting device of a motor vehicle|
    EP2306074A2|2009-10-05|2011-04-06|Automotive Lighting Reutlingen GmbH|Motor vehicle headlight with a semiconductor source, light module with a primary lens and a secondary lens|
    EP2743567A1|2012-12-14|2014-06-18|Valeo Vision|Primary optical element, lighting module and headlight for motor vehicle|WO2021244736A1|2020-06-03|2021-12-09|HELLA GmbH & Co. KGaA|Headlamp for a motor vehicle|
    EP3961085A1|2020-08-25|2022-03-02|Lumileds LLC|Lighting system for automotive headlamp|
    法律状态:
    2019-10-31| PLFP| Fee payment|Year of fee payment: 2 |
    2020-05-01| PLSC| Publication of the preliminary search report|Effective date: 20200501 |
    2020-10-30| PLFP| Fee payment|Year of fee payment: 3 |
    2021-10-29| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1859869A|FR3087875B1|2018-10-25|2018-10-25|LIGHT MODULE FOR VEHICLE LIGHTING DEVICE|FR1859869A| FR3087875B1|2018-10-25|2018-10-25|LIGHT MODULE FOR VEHICLE LIGHTING DEVICE|
    US17/288,349| US20210381669A1|2018-10-25|2019-10-15|Luminous module for vehicle lighting device|
    JP2021522524A| JP2022512815A|2018-10-25|2019-10-15|Luminous module for vehicle lighting fixtures|
    CN201980070619.0A| CN113039387A|2018-10-25|2019-10-15|Light-emitting module for vehicle lighting device|
    PCT/EP2019/077969| WO2020083711A1|2018-10-25|2019-10-15|Luminous module for vehicle lighting device|
    EP19816204.2A| EP3870893A1|2018-10-25|2019-10-15|Luminous module for vehicle lighting device|
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