• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A primary optical element (3) for a motor vehicle lighting module comprises a light-introducing part (7) provided with a plurality of primary optical means (8, 9) connected at the output to a corrective part (6). ), said primary optical means being arranged on at least two levels in a first direction in first (8) and second (9) separate primary optical means. A plurality of first primary optical means (8) are arranged in series in a second direction substantially perpendicular to the first direction. The invention also relates to a light module for a motor vehicle headlamp which comprises a plurality of light sources (1,2), such a primary optical element (3) and an associated secondary optical element (4).
    公开号:FR3041738A1
    申请号:FR1559101
    申请日:2015-09-28
    公开日:2017-03-31
    发明作者:Kostadin Beev；Marine Courcier；Vanesa Sanchez
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    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 a primary optical element associated 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 case of reduced brightness, by a global light beam. These projectors, a left projector and a straight projector, comprise one or more light modules adapted to generate and direct an intermediate light beam whose addition forms said overall light beam.
    These projectors can generally be used in two lighting modes: a first "high beam" mode producing a Route beam and a second "low beam" mode producing a Code beam. The "high beam" mode provides strong illumination of the road far ahead of the vehicle. The "low beam" mode provides more limited illumination of the road, but still 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 another depending on traffic conditions. It is known to make the high beam beam by addition of the beam Code and a complementary beam, joined the beam Code at the cutoff edge. The beam Code is generated by the only ignition means specific to the second mode "dipped beam" while the beam Route is generated by the simultaneous ignition means specific to the second mode "dipped beam" and means specific to the first mode " Redlights ".
    There is now a need, in the field of the automobile, to be able to illuminate the road ahead in "partial road lighting mode", namely to generate in a beam "road lights" one or more dark beaches corresponding to the places where are present oncoming vehicles or vehicles driving ahead, so as to avoid glare for the drivers of these vehicles while illuminating the road in its larger area. Such a function is called ADB (Adaptive Driving Beam in English) or "selective beam Such an ADB function is to firstly automatically detect a user of the road may be dazzled by a lighting beam emitted in headlight mode by a projector, and on the other hand automatically change the contour of this light beam so as to create a shadow zone at the location of the detected user, without manual intervention of the driver of the vehicle. The advantages of the ADB function are multiple: comfort of use, better visibility compared to a lighting in dipped beam mode, better reliability for the change of mode, risk of dazzling greatly reduced, driving safer.
    There are known light modules for the production of selective beams 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 may switch off or on depending on detection instructions of a nearby vehicle.
    The shape and arrangement of the guides relative to each other in a module of a projector must be very precise in order firstly to be able to produce an intermediate beam at the output of the module that is homogeneous and smoothed when all the segments are lit, and for the other hand to have a complementary intermediate beam of the intermediate beam produced at the output of the other projector. In the document FR 2 999 679, the Applicant has disclosed a monobloc primary optical element capable of integrating into a light module further comprising a projection system, said primary optical element comprising guides made of material with a plane face arranged in a ball whose opposite face is substantially spherical, the ball forming in particular a correction portion to improve the optical efficiency of the system and to correct the aberrations of the light module.
    The present invention is part of a context of optimization of these matrix lights as well as in the context of the multiplication of the lighting functions that can be proposed to the users, and among which we can, for example, identify the function high-speed lighting, or highway, (so-called "Motorway Light" function), wherein the intensity of the beam is increased around the optical axis of the projector to increase the range of illumination, or the rainy weather function (so-called AWL function for "Adverse Weather Light"), in which the beam of low beam is controlled so that the reflection of the light from the headlights 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 acronym DBL (for Dynamic Bending Light), in which the objective is to illuminate dynamically turns when the vehicle is turning. For this purpose, it is known to mount the rotating light module about a substantially vertical axis of rotation, and therefore in a turn, the beam projected at the exit of the headlamp is no longer oriented in the longitudinal axis of the vehicle but towards the inside of the bend.
    It is 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 these modules. The invention is part of this context and it aims at providing 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 output to a light source. corrective 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 sets of light sources independent of each other and which are both connected to a common optical correction element, which facilitates the projection of separate light beams in a single light module. The sound series in particular are 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 a series of characteristics, which can be taken alone or in combination, specific to the arrangement of the different primary optical means, it can be provided that: the primary optical means have an output face connected to the corrective part and a front face; light entry turned opposite this corrective part; - The ignition of the second primary light sources creates a beam Code and ignition of all primary light sources, the first and second, creates a Route beam, with an upper part, likely to dazzle users on the road scene, which is matrix with contiguous regions, for example segments, that can be switched off selectively to avoid this glare; 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 input face of the second primary optical means may be of variable profile from one end transverse to the other of the 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 medium is traversed from one end to the other, 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 transversal, we can consider that each second primary optical means comprises a connecting portion with the correcting portion and an optical profile installed on the joining portion, the joining portions of the second primary optical means forming a common junction portion extending continuously in the second direction. the input face of the primary optical medium has a plurality of convex shapes: these convex shapes may in particular be defined by shapes having contiguous lateral ends of the adjacent convex shapes and a central part between these lateral ends which is convex, away from each other; the corrective part; - The output faces of the primary optical means are axially offset 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; it will be possible in particular to provide for the junction between these first and second means to pass through this optical axis; the output face of the second primary optical means, with respect to the corrective part, is set back axially with respect to the output faces of the first primary optical means.
    According to another series of characteristics, which can be taken alone or in combination, this time with the arrangement of the corrective part, provision can be made for: the corrective part comprises an at least partly dome-shaped exit face substantially spherical: it will be noted that by "substantially spherical dome" is meant a surface whose shape at least partially matches that of a sphere, and that in other words, the corrective part is delimited at least by one face outlet 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 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 input face of the corrector may be flat or be part of a curved profile including the focal surface of a secondary optical element; the corrective part may also take a partial shape of a ball, and possibly a truncated ball portion, that is to say cut off 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, on the other hand, it makes it possible to correct the optical aberrations of the optical system and thus to ensure good quality imaging. The primary optical element according to the invention is advantageously monobloc. At least the first primary optical means and the corrective part form an assembly that can not be undone without causing the degradation of one or the other. More so, the second primary optical means can form a one-piece structure with said corrective part and said first primary optical means. In order to obtain this one-piece arrangement, it is possible to make all of the components of this primary optical element in one piece, in particular by molding, or to relate one of these components, for example the secondary optical medium. It is notable that, in order to facilitate the transmission of light rays through the introduction portion and the corrective portion, and not to generate deviation of the rays when passing one from the other, the respective refractive indices of the means primary optics and the corrective part may be substantially identical. And in this context and a complementary advantage to facilitate obtaining, in particular by molding, the monobloc structure, the primary optical means and the corrective part may be made of the same material, and they may be from the same polymer.
    According to characteristics of the invention, taken alone or in combination with each other 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 of a light source disposed opposite its light entry 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 a strip shape vertical luminous having a lower edge, and in particular having sharp vertical edges; at least one first primary optical means comprises an upper or lower face having a cylindrical portion shape; the input 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 corrective part extends at an angle of between 0 ° and 45 °; ° at least one 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 input face to its exit; the first primary optical means and the first primary light sources associated with them, and arranged facing the input face, are configured so that the rays emitted by these light sources penetrate into the first corresponding primary optical means via the rear face; then propagate inside this first primary optical means towards the exit face, possibly by successive internal total reflections on the lower, upper and lateral faces; the cross section of each first primary optical means may have a generally parallelogram shape, and more precisely a rectangle shape; 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 corrective part, substantially on the focal surface object of the system of projection, 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 generally having a cylindrical portion shape with a substantially ellipsoidal generatrix, which has the particular effect of concentrating the light intensity in the upper part of the beam emerging from the first means primary optics, which corresponds to a zone (called "range area") located in the bottom of the matrix beam produced at the output of the light module and which corresponds to the cutoff zone at the junction with the beam Product code at the output of the module optically by the interaction of the second primary light sources and the associated second primary optical means.
    According to the invention, it can be provided that the or each second primary optical means is intended to receive a second primary light beam of a second primary light source disposed opposite its light entry face and that it is arranged to shape this second primary light beam so that the projection of this second primary light beam on the road has an upper cutoff. Where appropriate, the second primary optical means may be arranged so that the upper cutoff is a flat cut, or alternatively has at least one oblique cutting portion.
    According to various characteristics specific to this second primary optical means, it may be provided that: the lower face of the second primary optical means may be a curved surface generally having a cylindrical portion shape, which has the effect of concentrating the luminous intensity in the lower part of the beam coming out of the second primary optical means, which corresponds to an area located closest to the cutoff at the output of 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 act as a total reflection folder, that is to say a role of concentration of the projected light beam at the output of the corresponding primary optical means; the first and second primary optical means join, at their output face, an edge whose profile is that of the desired cutoff for the beam Code 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 floor arrangement of two distinct series, which can also take different forms from one series to another . In particular, these primary optical means may consist of light guides or take the form of microlenses, pads or collimators.
    In addition, it is conceivable to have a single second primary optical means, in particular for producing a static code beam, or to have a plurality of second primary optical means, in particular for producing a dynamic code beam. for adaptive cornering lighting 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 respectively associated 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, it can be provided that the primary light sources are mounted on a support extending as much opposite the first primary optical means as the second primary optical means. And it may be envisaged that the support is not flat but that it can have an inclined shape to be facing light guides not necessarily arranged in the same vertical plane. The invention further relates to a motor vehicle headlamp light module, which comprises a plurality of primary light sources, a primary optical element as discussed above and an associated secondary optical element. The different 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 produce, on the one hand, via light sources and the series of separate primary optical means, a segmented Route beam which is a clear image of the segmented arrangement of the outputs. on the corrective part of the primary optical element and, on the other hand, via light sources and the continuous primary optical means, a horizontally homogeneous rendered beam, the vertical focus being maintained to create a horizontal cut-off (eg code type) net.
    According to the invention, the distance between the primary optical element and the secondary optical element is strictly greater than zero.
    It will be possible to provide patterns, such as "modulations" or "microstructures", on the surfaces of the secondary optical element 4 to voluntarily add a controlled cutoff blur.
    A light module according to the invention, in which a primary optical element carries stepped primary optical means able to be opposite distinct series of primary light sources, allows with a single means to perform a plurality of optical functions, among which in particular a function called DBL (Dynamic Bending Light in English for mobile lighting of turn) or a function called AWL (Adverse Weather Light in English, for fire of bad weather). It will be possible to easily achieve one and / or the other of these functions by a modulation of the light intensity emitted by the primary light sources facing the primary optical means. The invention also relates to a motor vehicle headlamp comprising at least one light module as just presented. Other features and advantages of the present invention will emerge more clearly from the description and the drawings, in which: FIG. 1 is a perspective illustration of a primary optical element and a secondary optical element of a optical assembly for a light module according to a first embodiment of the invention; FIG. 2 is a detail view of a primary optical element and a plurality of primary optical means, in the form of light guides, integral with it; FIGS. 3 and 4 show an at least partially segmented light beam, FIG. 3 showing the beam produced by a single optical assembly as illustrated in FIG. 1 while FIG. 4 represents the beams produced by two optical assemblies arranged in FIG. one with respect to the other so that the respective beams are superimposed; FIG. 5 is a vertical sectional view of the optical assembly illustrated in FIG. 1, in which the secondary optical element is not visible; and FIG. 6 is a superposition of two horizontal sectional views, one along the axis XX shown in FIG. 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 according to the trihedron L, V, T illustrated in 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 superposed in a first direction, here vertically one above the other, a series of first primary light sources 1 (visible in particular 2) being arranged in a series of second sources of primary lights 2. The module further comprises a primary optical element 3 and a secondary optical projection element 4, having an optical axis Ai.
    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 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 in Figure 5), which limits the number of parts of the light module. The primary optical element 3 comprises a corrective part 6 and a light-introducing part 7 through which the light rays emitted by the first and second primary light sources 1 and 2 penetrate into the primary optical element and then be led through in the corrective part. The light-introducing part 7 comprises in 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 secondly a second primary optical means 9, here a single light guide forming a strip of material extending in a second direction, here transversely, in a continuous manner and arranged directly above the first guides 8 and a rear face 90 of which, opposite the corrective part 6, is arranged facing the second primary light sources 2.
    According to the invention, two types of primary optical means are connected to the same corrective part 6 transmitting the light towards 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 second single 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. The separated nature of the first primary optical means 8 and the continuous character of the second primary optical means 9 are distinguished 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 each other means for junctions of the primary optical means with machining and / or injection rays due to the constraints of methods of producing the primary optical element.
    It is advantageous that at least one of the two types of primary optical means form with the corrective part 6 a monobloc structure. By "monobloc structure" is meant that the elements of the structure are not separable without destruction of at least one of the elements. In the example illustrated in FIG. 1, it has been provided that the first primary optical means in series were 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 it is understood 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 band 9) may have come from material for with the corrective part 6 forming a monobloc structure.
    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 in FIG. optical.
    It is understood that, if in the embodiment illustrated the primary optical means are constituted by light guides, these primary optical means may be constituted, in particular in the part for generating a beam Code, by microlenses, pad or pins. collimators. In the latter case, it is possible to provide revolution collimators or horizontal collimators, ie collimators having horizontally a collimator profile that has been extruded in a vertical curve. Thereafter, will be designated by light guide any primary optical medium.
    The corrective portion 6 is a sphere portion, or a ball portion, centered on the exit of one of the first guides. More precisely, in the particular example of FIG. 1, the corrective part 6 is a half-ball whose center is situated in the exit plane of this first guide and on the optical axis Ai. 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 an outlet front face 61 facing the secondary optical element 4. The rear face 60 of the corrective part 6 extends here in the cutting plane of the half-sphere. It could, however, have any shape, provided to connect with the outputs of the first light guides 8 and the output of the material band forming the second light guide 9 and not to change the path of the rays from the exit ends of the guides and propagating in the corrective part 6.
    The projection system formed by the corrective part 6 and its outlet face 61 and by the secondary optical projection element 4 defines an object focal surface SF, visible in particular in FIGS. 5 and 6.
    As will be described in more detail below, the shape of the rear face 60 of the corrective portion may be defined so that the exit surface of a first type of guide is disposed substantially on the object focal surface of the deflection 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 surface focal object.
    In the illustrated embodiment, the corrective part 6 has a half-ball or half-sphere shape defined by the rear face 60 forming the sectional plane and the substantially spherical outlet face 61. Other embodiments are possible. By way of example, the corrective part may be a truncated ball portion, that is to say cut off on each side of the spherical portion formed on the exit face. Again, the corrective part 6 may have a slightly deformed half ball shape, in particular with ball portions which extend along a progressive radius of curvature until reaching the rear face 60 of the corrective part 6.
    In each of these variant shapes, it is notable that the light introduction portion 7 and the corrective portion 6 are made of the same material and have the same refractive index. By "same refractive index", it is meant that the refractive index of the light-introducing portion 7 and that of the corrective portion 6 are equal to the nearest hundredth. By "same material" it is meant that the corrective part 6 and the light-introducing part 7, and within it 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 derived from the same polymer. If they come from the same polymer, the first and second guides may have a charge different from that of the corrective part 6. As an illustrative example, the guides may be made of PMMA-HT (from English Polymethyl MethAcrylate High Temperature - high temperature methyl polymethacrylate) with a refractive index of 1.490 and resistant to high temperatures, and the PMMA-8N corrector with a refractive index of 1.491 and less expensive.
    It can also be provided that the first and second guides are loaded differently, it being understood that it should be ensured that the first light guides 8, individually associated with a first primary light source, are resistant to high temperatures.
    The material constituting the corrective part 6 on the one hand, and the first light guides 8 and the second strip-shaped guide 9 forming the light-introducing portion 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 initially individually the first 8 and second 9 light guides.
    Each first light guide 8 extends along a longitudinal axis and has at each of its longitudinal ends a rear face 80 of light input, disposed opposite one of the first primary light sources 1, and a front output, or output end or output interface, 81 acting as a secondary light source, connected to the corrective part 6. It further comprises, for connecting its two longitudinal end faces, two lateral faces 82, an upper face 84 and a lower face 85.
    For each pair formed of a first primary light source 1 and a first associated light guide 8, the distance between an output plane of the light source and the input face of the associated first guide is between 0 , 1 millimeters and 1 millimeter.
    The first light guides 8 and the first primary light sources 1 associated, and arranged opposite the input face, are configured so that the rays emitted by these light sources penetrate into the first corresponding guide by the rear face 80 then propagate inside this first guide towards the exit face 81, possibly by successive internal total reflections on the lower, upper and lateral faces.
    The cross section of each first light guide 8 (that is to say transverse to the optical axis of the guide) here has a generally parallelogram shape, and more precisely a rectangle. However, the cross section of the first guides could be of any shape. It could for example include curved sides. In any case, it is adapted to produce a desired form of light beam at the output of the light module.
    The outputs 81 of the first light guides 8, here rectangular, are secondary light sources for producing respective light beams at the output of the light module. These light beams have generally rectangular shapes in cross section (that is to say transverse to the optical axis Ai).
    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 to infinity in this segmented arrangement.
    As can be seen in FIG. 2 in particular, the upper face 84 of each of the first guides 8 is a curved surface generally having the shape of a cylindrical portion of substantially ellipsoidal generatrix. This has the effect of concentrating the light intensity in the upper part of the beam coming out of the first guide 8, which corresponds to a zone (called "range zone") located in the bottom of the matrix beam produced at the output of the light module and which corresponds to the cut-off area at the junction with the product code beam at the output of the optical module by the interaction of the second primary light sources and 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 inlet 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. Alternatively, they could be flat and inclined relative to the longitudinal axis of the first guides. The lower or lower flare of each first guide allows a vertical downward spread of the secondary light source 81 at the output of the first guide, which corresponds to an upward spread of the corresponding region of the beam. By shaping the bottom of the first guides 8, the top of each contiguous region is softened, the light intensity decreasing vertically upwards gradually.
    In FIG. 5, illustrating in vertical and longitudinal section the primary optical element 3 and the associated primary light sources 1, 2, it is clearly seen that, as previously stated, the second light guide 9 is disposed at above the first light guides. We will now describe in more detail this second light guide, again referring to FIGS. 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 independently independent guides and guiding the only the light rays emitted by the light source associated with them, the second light guide has the shape of a single continuous strip of material from one transverse side to the other of the primary optical element.
    The second light guide 9 comprises two vertical end faces, one of which faces the first light guides and a rear face 90 of light entry, arranged opposite a series of second primary light sources 2 , said rear face 90 being opposite a front exit, or output end or exit interface, 91 acting as a secondary light source, connected to the corrective part 6.
    It is noticeable in the illustrated embodiment that the light input rear face 90 has a transverse succession of convex shapes, here having a regular boss shape 92, so that the rear face of the second light guide has a shape corrugated. This undulating shape is oriented so that the center of each boss is turned away from the corrective part 6, in the direction of a rapprochement of the light sources. Each boss is arranged opposite 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 joined in pairs, and it is known to define a secondary input face 94 of this second primary optical means, identified as the surface connecting one after the other end edges 93 of the bosses.
    In other words, it is possible to define the second primary optical means, which extends over the first primary optical means, in a succession of second primary optical means in a second direction, here transversal, and it can be considered that each second primary optical means comprises a junction portion 95 with the correcting portion 6 and an optical profile 96 installed at a free end of the joining portion, opposite the corrective portion, the joining portions of the second primary optical means forming a common joint portion extending continuously in the second direction.
    As was previously seen 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 second associated light guide 9, the distance between an output plane of the light source and the input face of the associated second guide is between 0.1 millimeters and 1 millimeter.
    The second light guides 9 and the second primary light sources 2 associated, and arranged facing the bosses 92 of the input face, are configured so that the rays emitted by these light sources penetrate into the second corresponding guide by the rear face 90 and then propagate inside this second guide to the exit face 91, possibly by successive internal total reflections on an upper face and a lower face 97, facing the first light guides 8. It is understood that in the case of the second light guide, the rays emitted by a second source of primary light 2 through one of the bosses 92 of the rear face 90 of the ray input can cross, between the secondary entrance 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 output 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 crossover. beam emitted by different second primary light sources.
    In Figure 5, the lower face 97 of the second guide 9 is a curved surface generally having a cylindrical portion shape, 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 coming out of the second guide 9, which corresponds to an area located closest to the cutoff at the output of the light module. The spacing of the opposite faces of the first and second guides also contributes to the molding of a single piece to form the primary optical element 3, forming a clearance angle sufficient to demold the part. Π is particularly attentive to the curvature of this lower face 97 of the second guide 9 and the transverse line of contact between the lower face 97 of the second guide 9, the rear face 60 of the corrective portion 6, and the upper face 84 of the first guides, since it participates in the formation of the beam cut.
    In the particular example described here, the first light guides are ten in number and the second light guide 9 has six bosses 92 on its input face 90. As a result, ten primary and six second primary light sources Primary light sources are arranged on the common support 5 facing the light guides. Of course, these numbers could vary, but preferably be greater than one, and they could be equal so that as many independent first guides would be provided as bosses on the second single guide.
    In a context of a light module provided in a left or right vehicle projector, and therefore a light beam generated by a module of a left projector superimposed on a light beam generated by a module of a straight projector, an offset can be provided. transversely of the first independent light guides involved in the formation of contiguous regions of the beam, without having to provide a transverse shift of the second single light guide. It is understood that if the first and second light guides can be shifted transversely relative to each other, their staggered arrangement one above the other remains the same.
    In FIGS. 5 and 6, a characteristic of the invention relating to the position of the exit faces of the different light guides with respect to the object focal surface SF defined by the projection system formed by the corrective part 6 is made visible. of the primary optical element and the secondary optical element 4. The outputs 81,91 of the first and second light guides 8 are positioned on this object focal surface SF. And it is advantageous, for reasons previously mentioned, that the secondary inlet face 94, that is to say the curved surface passing successively by each of the end edges of the bosses, is disposed upstream of the focal surface SF object with respect to the direction of light emission of 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, the junction of the second primary optical means and the corrective part, is homogeneous horizontally due to the mixing of rays emitted by neighboring light sources between the secondary entrance face 94 and the exit face 91. This results from the design of the second primary optical means according to which, as previously stated, it extends continuously between the secondary entrance face 94 and the exit face 91.
    FIG. 3 represents the light beam 100 projected at the output of the light module. In particular, luminous segments 110 respectively produced by the secondary light sources 81 at the output of the first guides 8 can be distinguished, as can 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 ignition of the second primary light sources creates a beam Code and the ignition of all primary light sources, the first and the second, creates a beam Route, with an upper part, likely to dazzle users on the road scene, which is matrix with contiguous regions, for example segments, that can be extinguished selectively to avoid this glare. It is understandable, particularly with reference to FIG. 3, that the production of a matrix beam with first distinct lightguides arranged in transverse series generates an infinite projection of contiguous regions, and for example segments, very distinct. The presence of two modules in the same projector can allow a slight angular offset, horizontally, to homogenize in this plane the projected beam as shown in Figure 4, in which there is illustrated the superposition of two beams 100 'and 100 "Generated by two modules arranged in the same projector, here 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 two broad beams as well as two segmented beams, and thus obtain a denser and more homogeneous beam as illustrated in Figure 4.
    With reference to FIGS. 1 and 2, the row of first light guides 8 comprises a left lateral end guide 8j and a right lateral 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 comprise a left lateral face 82 of spreading shaped to widen laterally, continuously, the cross section of the guide from its input face to its output. The left side face 82 may be curved to flare from the rearward entry face 80 of the first left end guide 8j to its exit 81. The lateral widening of the first left end guide 8j allows a spreading lateral to the left of the secondary light source at the exit of the first left end guide 8j, which corresponds here to a lateral spread to the right of the light segment produced as shown in Figure 4. Through the implementation of form of the left side of the first left end guide 8j, the right edge of the corresponding light segment is softened, the light intensity decreasing laterally to the right gradually.
    Note that the light module shown in Figures 1 and 2 is intended to equip a left projector of a motor vehicle, and that Figures 3 and 4 correspond to beams made by modules in the left projector. And it is understood that the light module for a right motor vehicle headlight 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 8j of Figure 2.
    The light rays transmitted via the light-introducing part, after passing through the corrective part 6, propagate towards the secondary optical projection element 4 and pass through it.
    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 opening of the light rays emitted by the primary light sources 1 and 2, the rays entering the light guides 8 and 9 being folded by the laws of refraction . In addition, at the interface between each light guide 8,9 and the corrective part 6, the light rays are not deflected due to the connection between the first guides 8 and the corrective part 6. Thanks to this, the reduced opening of the rays is preserved. Finally, the light rays issuing from the corrective part 6 by the exit face 61 are not deviated or little deviated thanks to the spheroidal dome shape of the outlet face 61. Indeed, the half-spherical corrective part 6 being centered on the junction at the output of one of the first guides and the second guide, a radius from the output plane of this first guide at the optical axis Ai is normal or almost normal to the output face 61 and is not therefore not deviated to the interface between the corrective part 6 and the surrounding air. A ray coming from an area separated from the optical axis is folded towards this optical axis. The refraction at the interface between the corrective 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 corrective 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 convergent optical lens having the axis Ai for an 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 the primary optical element 3. By virtue of this, the light module is adapted to create an infinite image of the secondary light sources formed at the exit ends of the guides. It is thus possible to generate several light segments, with good imaging, using a same primary optical element 3 and from the light guides positioned on or off the optical axis Ai. The half-ball forming the corrective portion 6, slightly modifying the orientation of the rays emitted by the outputs of the guides which are offset with respect to the optical axis Ai, at the output interface 61, has a field corrector effect .
    The foregoing description clearly explains how the invention makes it possible to achieve the objectives that it has set itself and in particular to propose a light device that facilitates the design and manufacture of a plurality of optical guides and their installation. in a module facing light sources for guiding light beams 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 one-piece realization of at least one series of these guides and the corrective part associated with the all these guides.
    As has been mentioned above, it is particularly advantageous to associate with this corrective part 6 a particular arrangement of light guides in that are superimposed two types of distinct guides, arranged in particular differently with respect to the object focal plane of the system. projection formed by the output interface 61 of the corrective 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 emerging from 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 Route beam, are beams parallel rays forming luminous 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 carries the transverse ends of each of the patterns formed in series on the entry face of the first guide is defocused, upstream of this focal surface object.
    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 recovered largely at the output of the module to create light beams capable of forming light segments on the one hand for the complementary route beam and a global 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 complementary beam Route whose shapes are perfectly controlled and a beam Code homogeneously rendered horizontally by the defocusing of the light. web of continuous material for spreading the rays in the corrective part. "Modulations" or "microstructures" type patterns could be added to the surfaces of the secondary optical element 4 to voluntarily add a controlled cut-off blur.
    It will be understood that the production of a primary optical element carrying staged light guides able to face different sets of primary light sources makes it possible, with a single means, to perform a plurality of optical functions, among which in particular a so-called DBL function. (Dynamic Bending Light in English for mobile lighting of turn) or a function called AWL (Adverse Weather Light in English, for fire of bad weather). One and / or the other of these functions is easily achieved by modulating the light intensity emitted by the primary light sources facing the light guides. For example, one can progressively, from right to left or from left to right according to the direction of the detected turn, increase the intensity of the light sources to increase the visibility on one side of the overall light beam and thus achieve a function DBL. In the case of a rainy road, it is possible to reduce the luminous 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 can not be limited to the embodiment specifically described in this document, and that it extends in particular to all equivalent means and to any technically operating combination of these means.
    In particular, we will find below a non-exhaustive list of possible variants, which fall within the scope of the invention: - it has been previously described that the primary light sources are mounted on the same support, which allows to limit the number of pieces of the luminous whole. It will be understood that this support may be plane, as illustrated in FIG. 5, or have two parts inclined with respect to each other by an angle, if it is desired that a series of primary sources emit parallel to the optical axis and that the other series of primary sources emits at a given angle with respect to the optical axis. - As it could be illustrated and described, it is possible that the second light guide, arranged above the first independent guides of each other and formed by a single strip to the curved light inlet faces, is realized in one piece with the corrective part, itself in one piece with the first guides, so as to form a monobloc structure as a whole, or it is possible that the second strip guide is made separately, it being understood that its implementation 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 optical element primary and therefore it can be fixed on the corrective part outside the contact area of the exit faces of the guides and the rear face of the corrective part where the light rays pass. This embodiment may be preferred, with a second guide attached to the corrective part after being manufactured elsewhere, to reduce the spacing between the upper faces of the first guides and the lower face of the second guide, this gap being made necessary in the case of a one-piece construction of the assembly to facilitate demolding. in the foregoing, it has been specified that the entry face of the second light guide, which extends continuously over the first light guides, was provided with successive bosses, each boss being associated with a source specific primary light. It can be provided to have a strip of material at the substantially flat, non-protruding entrance face, provided that there is an associated primary light source which extends substantially over the entire transverse dimension of this second guide. light. in the foregoing description, the projection optical element is a lens. As a variant, the lens could be replaced by any other optical projection element capable of creating, at infinity, an image of the outputs of the light guides. This projection element could comprise one or more lenses, or one or more reflective mirrors, or 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 in output of the light module, and vice versa, 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-introducing part 7 and the correcting part 6 must be adapted according to the shape of the desired light beams at the output of the light module. The invention also relates to a motor vehicle headlight incorporating one or more optical lighting modules according to any one of the described embodiments.
    权利要求:
    Claims (18)
    [1" id="c-fr-0001]
    A primary optical element (3) for a motor vehicle lighting module, comprising a light-introducing portion (7) provided with a plurality of primary optical means (8,9) outputly connected to a correcting portion (6), said primary optical means being arranged on at least two levels in a first direction in first (8) and second (9) primary primary optical means, a plurality of first primary optical means being arranged in series in a second direction substantially perpendicular to the first direction.
    [2" id="c-fr-0002]
    2. Primary optical element (3) according to claim 1, characterized in that the primary optical means (8, 9) have an exit face (81, 91) connected to the corrective part (6) and an entry face. (80,90) of light turned opposite this corrective part (6).
    [3" id="c-fr-0003]
    Primary optical element (3) according to claim 2, characterized 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).
    [4" id="c-fr-0004]
    4. Primary optical element (3) according to the preceding claim, characterized in that the input face (90) of the second primary optical means (9) has a plurality of convex shapes (92).
    [5" id="c-fr-0005]
    Primary optical element (3) according to one of claims 2 to 4, characterized in that the second primary optical means (9) consists of a succession of second primary optical means, each comprising a junction part (95) with the correcting portion (6) and an optical profile (96) installed at one free end of the joining portion to form said input face (90), opposite the corrective portion, the joining portions of the second means primary optics forming a common junction portion extending continuously in said second direction.
    [6" id="c-fr-0006]
    6. primary optical element (3) according to one of claims 2 to 5, characterized in that the output faces (81,91) of the first (8) and second (9) primary optical means are positioned in the vicinity of an object focal surface (SF) of a projection system comprising at least said corrective part (6).
    [7" id="c-fr-0007]
    7. Primary optical element (3) according to the preceding claim, characterized in that a secondary input face (94) consists of a curved surface, passing successively by each of the end edges (93) of the convex shapes (92). ), and arranged upstream, with respect to the direction of light emission, of said object focal surface (SF).
    [8" id="c-fr-0008]
    8. Primary optical element (3) according to one of the preceding claims, characterized in that said corrective portion (6) comprises an outlet face (61) at least partly substantially spherical dome-shaped.
    [9" id="c-fr-0009]
    9. Primary optical element (3) according to the preceding claim, characterized in that the substantially spherical dome-shaped exit face (61) is substantially centered between the first primary optical means (8) and the second primary optical means (9). ).
    [10" id="c-fr-0010]
    10. Primary optical element (3) according to one of the preceding claims, characterized in that the first primary optical means (8) and the corrective part (6) form a monobloc structure.
    [11" id="c-fr-0011]
    11. Primary optical element (3) according to the preceding claim, characterized in that the second primary optical means (9) forms a one-piece structure with said corrective portion (6) and said first primary optical means (8).
    [12" id="c-fr-0012]
    12. 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 the corrective part (6) are substantially identical.
    [13" id="c-fr-0013]
    13. Primary optical element (3) according to one of the preceding claims, characterized in that the primary optical means (8,9) and the corrective part (6) are made of the same material.
    [14" id="c-fr-0014]
    An 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 respectively associated with each of the first primary optical means. (8) in transverse series while at least a second primary source is associated with the second primary optical means (9).
    [15" id="c-fr-0015]
    15. Optical assembly according to the preceding claim, in combination with at least claim 4 or 5, characterized in that a second primary source (9) is associated with each of the convex shapes (92), or each of the optical profiles (96). ), the second primary optical means (9).
    [16" id="c-fr-0016]
    16. Optical assembly according to one of claims 14 or 15, wherein the primary light sources (1,2) are mounted on a support (5) extending both opposite the first primary optical means (8) that second primary optical means (9).
    [17" id="c-fr-0017]
    17. Lighting module for a 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 13 and a secondary optical element associate (4).
    [18" id="c-fr-0018]
    18. Light module according to the preceding claim, characterized in that the different primary optical means of the primary optical element are arranged on the primary optical element so that the outputs of the first primary optical means (8) are positioned in the vicinity of a focal surface (SF) object of a projection system formed by the primary optical element and the secondary optical element while the output of the second primary optical medium (9) is offset longitudinally with respect to this focal surface object .
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    同族专利:
    公开号 | 公开日
    EP3147557A1|2017-03-29|
    CN106969318A|2017-07-21|
    EP3147557B1|2020-12-09|
    FR3041738B1|2020-01-17|
    US20170089536A1|2017-03-30|
    CN106969318B|2021-10-08|
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    法律状态:
    2016-09-28| PLFP| Fee payment|Year of fee payment: 2 |
    2017-03-31| PLSC| Search report ready|Effective date: 20170331 |
    2017-09-29| PLFP| Fee payment|Year of fee payment: 3 |
    2018-09-28| PLFP| Fee payment|Year of fee payment: 4 |
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    2020-09-30| PLFP| Fee payment|Year of fee payment: 6 |
    2021-09-30| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1559101|2015-09-28|
    FR1559101A|FR3041738B1|2015-09-28|2015-09-28|PRIMARY OPTICAL ELEMENT FOR LIGHT MODULE OF MOTOR VEHICLE|FR1559101A| FR3041738B1|2015-09-28|2015-09-28|PRIMARY OPTICAL ELEMENT FOR LIGHT MODULE OF MOTOR VEHICLE|
    EP16189922.4A| EP3147557B1|2015-09-28|2016-09-21|Primary optical element for lighting module of a vehicle|
    US15/272,997| US10228108B2|2015-09-28|2016-09-22|Primary optical element for motor vehicle lighting module|
    CN201610855499.3A| CN106969318B|2015-09-28|2016-09-27|Main optical element for a lighting module of a motor vehicle|
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