• 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 light device for a motor vehicle comprises a semiconductor light source (1) and a projection optic adapted to image the light source on the outside of the vehicle. The light source comprises a plurality of electroluminescent rods (8) of submillimetric dimensions, wherein the density and / or the height of the rods are adapted so that the light source has at least a first zone (ZR ') and a second zone (ZC ') defined by a plurality of rods and having different luminances from one area to another.
    公开号:FR3039880A1
    申请号:FR1557619
    申请日:2015-08-07
    公开日:2017-02-10
    发明作者:Lothar Seif；Pierre Albou；Vanesa Sanchez；Calvez Gilles Le
    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. BACKGROUND OF THE INVENTION
    A motor vehicle is equipped with headlamps, or headlights, intended to illuminate the road in front of the vehicle, at night or in the case of reduced luminosity. These projectors can generally be used according to different modes of lighting among which we can distinguish a first mode "high beam" and a second mode "low beam". The "high beam" mode provides strong illumination of the road far ahead of the vehicle. The "low beam" mode provides more limited road lighting, but still offers good visibility without dazzling other road users. These two modes of lighting are complementary, and one passes from one to the other according to the traffic conditions. Each lighting function can be provided by a module, and the different modules are arranged side by side in the projector, or for reasons of visual comfort for the driver, cost and aesthetics, manufacturers can propose projectors in which a module is able to perform alternately one or other of the functions, so that the corresponding light beam emerges from the same optical output face. We understand that this problem applies regardless of the combination of lighting functions that we want to put in place. In any case, it is notable that the beams to be projected in front of the vehicle must have specific precise contours. For example, the beam corresponding to the "dipped beam" mode must have a cut, so as not to dazzle drivers of vehicles on the road scene to be illuminated, with a step advantageously to better illuminate the outside of the road . As a complementary example, it is interesting that the projected beams corresponding to both the "low beam" and "high beam" modes have a gradually decreasing light intensity towards the outside of the beam, in order to concentrate the light energy on the center of the road.
    Moreover, in light devices of motor vehicles, light sources are increasingly constituted by light-emitting diodes, in particular for advantages of space and autonomy compared to conventional light sources. The use of light-emitting diodes in light modules has also enabled market players (car manufacturer and lighting designer) to bring a creative touch to the design of these devices, in particular through the use of a light source. increasing number of these light emitting diodes to achieve optical effects. One of the drawbacks to the use of these diodes is that they represent lambertian type emitters, that is to say with a constant luminous intensity independent of the direction of emission, and that they have a fixed form, usually rectangular, which defines the lighting surface they produce.
    The contour of the projected beam is thus rectangular, in the case of direct imaging, that is to say the use of projection optics that does not deform by the source object for the projection to infinity . It is therefore impossible to provide with a single source the production of a projected image corresponding to a code-type beam with a horizontal bent cut, such that it may be desired for a better illumination of the aisles of the scene. road.
    And the constant light intensity does not make it possible to obtain an image to be projected whose intensity is decreasing progressively, as this can be sought to avoid too marked edges of the projected beam. In addition, with this type of source, a maximum intensity relatively weak compared to the rest of the beam and placed in the center of the beam is proposed.
    It is then expected to associate these light emitting diodes with optical systems made complex to modify the output beam. This complexification of the optical systems can in particular be done with an addition of optical element, and for example with the addition of a folder blocking rays emitted by the diode at the focus of the projection optics, or with the addition of an intermediate optical, so-called primary, between the source, and the so-called secondary optical projection projection output of the module. This complexification can also be done with a modification of the projection optics at the output of the module, for example by machining one or more surfaces of this projection optics. The invention aims to provide a lighting and / or signaling device that allows the use of a single projection optics while allowing to propose a beam meeting the requirements of the regulations.
    In this context, the invention relates to a lighting and / or signaling device for a motor vehicle, comprising a semiconductor light source and an optical lens adapted to image the light source on the outside of the vehicle.
    By optics adapted to image the source, is meant a projection optics which sends at infinity an image of the light source, and which may also take the form of a shaping optics which consists of means for change the direction of at least some of the light rays.
    According to the invention, the device is configured such that the semiconductor light source comprises a plurality of submillimeter size electroluminescent rods, the density and / or the height of the rods being adapted so that the light source has at least at least a first zone and a second zone defined by a plurality of rods and having luminances distinct from one zone to another.
    According to the invention, a technology is applied to the automotive field consisting in producing the light-emitting zone by a forest of electroluminescent rods of submillimetric dimensions that is grown on a substrate, to produce a three-dimensional topology. It will be understood that this three-dimensional topology has the advantage of multiplying the light emission surface with respect to the electroluminescent diodes known hitherto in the automobile field, namely substantially planar diodes.
    Furthermore, the setting up of a plurality of distinct zones with a luminance varying from one zone to another makes it possible, in collaboration with the optics as specified above, to produce a direct image, which consists of the projection to infinity of a faithful image of the light source. We will understand by direct imaging that we project at infinity an undistorted image of the source, and that we could, without leaving the context of the invention, to image the source outside the vehicle directly or indirectly by non-distorting reflection, and this as well on the road scene in front of the vehicle, or in height for the road signs for example.
    The luminance is variable in that it is likely to vary from one point to another, it being understood that by luminance at a point, we speak of the average luminance on a small circular surface centered on this point and including a number significant rods, and for example at least five rods.
    The present invention thus makes it possible to avoid the disadvantages presented above, by combining the use of a semiconductor source of three-dimensional topology, the arrangement of the electroluminescent rods that compose it makes it possible to obtain a particular contour and a variable luminance of the source from one zone to another, and a single projection optical element, unmodified, in order to generate all or part of several lighting and / or signaling beams.
    According to various features of the invention, it can be provided that: the density and / or the height of the electroluminescent rods are adapted so that the luminance is progressively variable from one zone to another; the density and / or the height of the electroluminescent rods are adapted so that the luminance is variable continuously from one zone to another; the light source comprises at least one group of electroluminescent rods forming an intermediate zone arranged between the first and second zones, the density and / or the height of the electroluminescent rods of said intermediate zone being adapted so that the luminance of the intermediate zone has a value between the luminance value of the first zone and the luminance value of the second zone; at least two intermediate zones are provided between the first and second zones, the density and / or the height of the electroluminescent rods in each of these intermediate zones being adapted so that the luminance progressively changes from the first zone to the second zone; each of the zones is configured to produce lighting of a given luminance, and distinct from the luminance of the neighboring zone (s); the electroluminescent rods of each of the zones are controlled to be lit simultaneously; the zones are selectively activatable from one another; - The electroluminescent rods are grouped into a sufficient number of areas to achieve a light distribution of a regulatory beam can be imaged directly outside the vehicle by said projection optics; the electroluminescent rods are grouped into at least ten distinct luminance zones; each distinct luminance zone comprises at least five electroluminescent rods; - the first zone is arranged substantially in the center of the light source and in that the second zone is peripheral to the central zone; the luminance of the first central zone is larger than the luminance of the second peripheral zone; the optics adapted to image the light source outside the vehicle comprises at least one reflector and / or at least one lens; we thus create, with simple elements, a real image of the remote source (finite or infinite) very large in front of the dimensions of the device (of a ratio of the order of at least 30, preferably 100) of the device ; the use of simple optical elements is here made possible by the flexibility offered by the electroluminescent rods to obtain a desired shape of the emitting zone and to obtain a determined luminance of this zone. the two zones of electroluminescent rods define an illuminating surface of the light source whose peripheral edge defines a contour of the light beam imaged on the outside of the vehicle by the light device.
    Such a light device may in particular consist of a front projector of a motor vehicle. The invention also relates to a semiconductor light source comprising a plurality of electroluminescent rods of sub-millimeter dimensions, wherein the density and / or the height of the rods are adapted so that the light source has at least a first zone and a second zone defined by a plurality of rods and having luminances distinct from one zone to another.
    According to different characteristics of this light source, which by extension can be combined with the presence of an optical element in a light device as presented above, it will be possible to provide that: the luminances distinct from the two zones are obtained by a density of arrangement rods different from one zone to another, and / or by an average height of the rods different from one zone to another; the density and / or the height of the rods within the same zone may in particular be variable to achieve a smoothed passage between the luminance of two neighboring zones; in particular the density and / or the height of the rods could evolve in the same zone progressively towards the other zone; the distance separating two immediately adjacent rods is at least equal to 2 micrometers, and at most equal to 100 micrometers.
    The electroluminescent rods can extend from the same substrate, and they can in particular be formed directly on this substrate. It can be provided that the substrate is based on silicon or silicon carbide. It is understood that the substrate is based on silicon since it comprises mainly silicon, for example at least 50% and in practice about 99%.
    According to characteristics specific to the constitution of the electroluminescent rods and the arrangement of these electroluminescent rods on the substrate, provision can be made for each characteristic that can be taken alone or in combination with the others: each rod has a generally cylindrical shape, in particular polygonal section; it can be expected that each rod is the same general shape, and in particular a hexagonal shape; the rods are each delimited by an end face and by a circumferential wall which extends along a longitudinal axis of the rod defining its height, the light being emitted at least from the circumferential wall; this light could also be emitted by the terminal face; - Each rod may have an end face which is substantially perpendicular to the circumferential wall, and in different variants, it can be provided that this end face is substantially flat or curved or pointed at its center; the rods are arranged in matrix, that this matrix is regular, with a constant spacing between two successive rods of a given alignment, or that the rods are arranged in staggered rows; the height of a stick is between 1 and 10 micrometers; the largest dimension of the end face is less than 2 micrometers; the distance separating two immediately adjacent rods is at least equal to 2 micrometers and at most equal to 100 micrometers; it is also noteworthy that this separation distance between two immediately adjacent rods can be the same between two rods of the same zone and between two rods of two adjacent zones. This ensures a contiguous realization of the zones of the light source, allowing the realization of a homogeneous light beam when the light source is turned on.
    According to other features, it may be provided that the semiconductor light source comprising a plurality of submillimeter-sized electroluminescent rods further comprises a layer of a polymeric material in which the rods are at least partially embedded; this polymeric material may be based on silicone, it being understood that the polymer material is based on silicone since it comprises mainly silicone, for example at least 50% and in practice about 99%. The layer of polymeric material may comprise a phosphor or a plurality of phosphors excited by the light generated by at least one of the plurality of rods. The term phosphor, or light converter, and for example a phosphorescent material, the presence of at least one luminescent material designed to absorb at least a portion of at least one excitation light emitted by a light source and to convert at least a portion of said excitation light absorbed into an emission light having a wavelength different from that of the excitation light. This phosphor, or this plurality of phosphors, may be at least partially embedded in the polymer, or disposed on the surface of the polymer, more or less away from the end face of the rods.
    The different zones of the light source are selectively activatable so that they can be switched on separately and a separate ignition control system is provided for the light-emitting rods forming these light zones, it being understood that this is mainly understood by means of that the plurality of light rods forming a first zone can be switched on or off distinctively from the plurality of rods forming another zone, simultaneously or not.
    We can play on the size of the illuminating surface of each of the zones of the light source by modifying the number of protruding rods of the substrate associated with one or the other of the zones, and therefore the size of each zone, or by changing the number of rods electrically connected to each other. It is thus possible to provide illumination areas of different dimensions that make it possible to propose a beam projected at infinity with a wider area than the other. Other features and advantages of the present invention will appear more clearly with the help of the description and the drawings, among which: FIG. 1 is a sectional view of a light device according to the invention, in which FIG. a semiconductor light source comprising electroluminescent rods, said rods not being represented to scale so as to make them visible, said source being oriented so that the rays emitted by the rods are directly directed towards a light source; shaping of the rays; FIG. 2 is a schematic perspective representation of a semiconductor light source according to one embodiment of the invention, said light source comprising two distinct zones of electroluminescent rods; FIG. 3 is a schematic representation in perspective of a semiconductor light source, in which rows of electroluminescent rods have been made visible in section; FIG. 4 is a sectional view of a particular embodiment of the invention, in which two electroluminescent rods project from a substrate, said electroluminescent rods being encapsulated in a protective layer; FIG. 5 is a graph representative of the luminance and the contrast of the light emitted by a semiconductor source of the light emitting device for producing a road-type lighting light; FIG. 6 is a view from above of part of the electroluminescent rods of a light source, serving as a basis for the definition of the luminance at a point; FIG. 7 is a schematic representation of one embodiment of the semiconductor light source according to the invention, the electroluminescent rods being divided into three distinct zones; and - Figures 8 and 9 are top views of a plurality of rods, divided into at least two selectively activatable zones, according to two distinct embodiments.
    A lighting and / or signaling device of a motor vehicle comprises a light source 1, in particular housed in a housing closed by an ice and which defines an internal volume of reception of this light source associated with a projection optics 2 adapted to infinitely image at least a portion of the light rays emitted by the light source.
    In Figure 1, the light source 1 is centered on the optical axis 40 of the converging lens forming the projection optics adapted to image the light source on the outside of the vehicle. The light source 1 is oriented so that the rays it emits are directly directed towards the lens. For reasons of space of the light device for example, it can be provided that the light source does not emit mainly in the direction of the optical axis of the lens, but substantially perpendicular to it, and that the rays are deflected by an optical means of paraboloidal reflector type.
    The light source 1 comprises, according to the invention, a plurality of electroluminescent rods 8, of submillimetric dimensions, arranged in a plurality of zones, among which at least a first zone 4 and a second zone 6 (as visible in FIG. 2). . The density and / or the height of the rods are adapted so that the light source has at least a first zone and a second zone defined by a plurality of rods and having luminances that are distinct from one zone to another.
    The structure of a semiconductor light source 1 having submillimetric size electroluminescent rods will firstly be described, in particular with reference to FIGS. 3 and 4.
    The light source 1 comprises a plurality of electroluminescent rods 8 which originate on at least one substrate 10. Each electroluminescent rod, here formed by the use of gallium nitride (Gn), extends perpendicularly, or substantially perpendicularly, protruding from substrate, here made based on silicon or silicon carbide other materials that can be used without departing from the context of the invention. For example, the electroluminescent rods could be made from a compound based on aluminum nitride and gallium nitride (AlnGn), or from a compound based on aluminum, indium and gallium.
    The substrate 10 has a lower face 12, on which is reported a first electrode 14, and an upper face 16, projecting from which extend the electroluminescent rods 8 and on which is reported a second electrode 18. Different layers of materials are superimposed on the upper face 16, in particular after the growth of electroluminescent rods from the substrate here obtained by an ascending approach. Among these different layers, one can find at least one layer of electrically conductive material, in order to allow the power supply of the rods. This layer is etched so as to connect a particular rod between them, the ignition of these electroluminescent rods can then be controlled simultaneously by a control module not shown here. It can be provided that at least two electroluminescent rods or at least two groups of electroluminescent rods are arranged to be lit separately by means of an ignition control system.
    The electroluminescent rods extend from the substrate and, as can be seen in FIG. 3, they each comprise a gallium nitride core 19 around which are disposed quantum wells 20 formed by a radial superposition of layers of different materials. here, gallium nitride and gallium-indium nitride, and a shell 21 surrounding the quantum wells also made of gallium nitride.
    Each electroluminescent rod extends along a longitudinal axis 22 defining its height, the base 23 of each rod being disposed in a plane 24 of the upper face 16 of the substrate 10.
    The electroluminescent rods 8 of the same light source advantageously have the same shape. They are each delimited by an end face 26 and a circumferential wall 28 which extends along the longitudinal axis. When the electroluminescent rods are doped and polarized, the resultant light output from the semiconductor source is emitted essentially from the circumferential wall 28, it being understood that light rays may also emerge from the As a result, each electroluminescent rod acts as a single light-emitting diode and the light output of this source is improved on the one hand by the density of the electroluminescent rods 8 present and on the other by the size of the surface. illuminant defined by the circumferential wall and which therefore extends around the entire periphery, and the entire height of the stick.
    The circumferential wall 28 of an electroluminescent rod 8, corresponding to the gallium nitride shell, is covered by a transparent conductive oxide (TCO) layer 29 which forms the anode of each rod complementary to the cathode formed by the substrate. . This circumferential wall 28 extends along the longitudinal axis 22 from the substrate 10 to the end face 26, the distance from the end face 26 to the upper face 16 of the substrate, from which the electroluminescent rods 8, defining the height of each stick. For example, it is expected that the height of an electroluminescent rod 8 is between 1 and 10 micrometers, while it is expected that the largest transverse dimension of the end face, perpendicular to the longitudinal axis 22 of the rod concerned , less than 2 micrometers. It will also be possible to define the surface of a rod, in a sectional plane perpendicular to this longitudinal axis 22, in a range of determined values, and in particular between 1.96 and 4 microns square.
    It will be understood that during the formation of electroluminescent rods 8, the height can be varied from one zone of the light source to the other, so as to increase the luminance of the corresponding zone when the average height of the rods constituting it is increased. Thus, a group of electroluminescent rods may have a height, or heights, different from another group of electroluminescent rods, these two groups constituting the same semiconductor light source comprising electroluminescent rods of submillimeter dimensions.
    The shape of the electroluminescent rods 8 may also vary from one device to another, in particular on the section of the rods and on the shape of the end face 26. Circular section electroluminescent rods have been illustrated in FIG. FIG. 3 shows electroluminescent rods 8 having a shape of polygonal section, and more particularly hexagonal section. It is understood that it is important that light can be emitted through the circumferential wall, that it has a polygonal or circular shape.
    Moreover, the end face 26 may have a substantially planar shape and perpendicular to the circumferential wall, so that it extends substantially parallel to the upper face 16 of the substrate 10, as shown in FIG. 3, or although it may have a domed or pointed form at its center, so as to multiply the directions of emission of light exiting this end face, as shown in Figure 4.
    In Figures 2 and 3, the electroluminescent rods 8 are arranged in two-dimensional matrix. This arrangement could be such that the rods are arranged in staggered rows. The invention covers other distributions of electroluminescent rods, in particular with rod densities which can be variable from one zone of the light source to another, and which can be variable within the zones of a same source. from light. FIG. 2 shows the separation distance d1 of two immediately adjacent electroluminescent rods in a first transverse direction and the separation distance d2 of two immediately adjacent electroluminescent rods in a second transverse direction. The separation distances d1 and d2 are measured between two longitudinal axes 20 of adjacent rods. The number of electroluminescent rods 8 projecting from the substrate 10 may vary from one zone to another, and therefore the separation distance between each rod may vary, in particular to locally increase the light intensity of the light source. but it is agreed that one or other of the separation distances d1, d2 must be at least equal to 2 micrometers, so that the light emitted by the circumferential wall 28 of each rod 8 can leave the matrix of electroluminescent rods . Furthermore, it is expected that these separation distances are not greater than 100 micrometers.
    It will be understood, as may have been previously stated for the height of the rods, that it is possible, with respect to the separation distances imposed between two adjacent rods, that during the formation of the electroluminescent rods 8, to modify the density of the rods from one zone of the light source to another, so as to increase the luminance of the zone comprising the highest density of rods. Thus, one group of electroluminescent rods may have a density different from another group of electroluminescent rods, these two groups constituting the same semiconductor light source comprising electroluminescent rods of submillimeter dimensions.
    The semiconductor light source 1 may further comprise, as illustrated in FIG. 4, a layer 30 of a polymeric material in which the electroluminescent rods 8 are at least partially embedded. The layer 30 may thus extend over the whole extent of the substrate or only around a given group of electroluminescent rods 8. The polymer material, which may in particular be based on silicone, creates a protective layer which makes it possible to protect the electroluminescent rods 8 without hindering the scattering of light rays. In addition, it is possible to integrate in this layer 30 of polymeric material wavelength converting means, and for example phosphors, able to absorb at least a portion of the rays emitted by one of the rods and to converting at least a portion of said absorbed excitation light into an emission light having a wavelength different from that of the excitation light. It can be provided without distinction whether the wavelength conversion means are embedded in the mass of the polymer material, or that they are arranged on the surface of the layer of this polymeric material.
    The light source may further comprise a coating 32 of light reflective material which is disposed between the electroluminescent rods 8 to deflect the rays, initially oriented towards the substrate, towards the end face 26 of the electroluminescent rods 8. In other words , the upper face 16 of the substrate 10 may comprise a reflecting means which reflects the light rays, initially oriented towards the upper face 16, towards the exit face of the light source. This recovers rays that otherwise would be lost. This coating 32 is disposed between the electroluminescent rods 8 on the transparent conductive oxide layer 29.
    According to the invention, the light source 1 has electroluminescent rods arranged and configured to form luminance zones that are distinct from one zone to another.
    In Figure 2, the light source generally has a rectangular shape, but it will be understood that it can present without departing from the context of the invention other general forms, including a parallelogram shape. And that according to the invention, the electroluminescent rods may extend projecting from the substrate in a predetermined configuration, or may be connected or not to define a non-necessarily rectangular lighting surface.
    In a first example illustrated in FIGS. 2 and 3, the light source 1 has an emitter portion 33 divided into two contiguous zones, among which a first zone 34 and a second zone 36, these two zones being arranged in series along Optical tax 40 defined by the light source and the shaping optics. The first zone 34 is disposed further than the second zone 36 with respect to the optical axis 40 and the main direction of emission of the rays, that is to say that it is located on the optical axis, compared to the second zone, closer to the exit of the light device. The separation 37 between the two zones 34, 36 follows here in the form of a right portion. As will be described in more detail below, this separation 37 can be obtained by the physical realization of a wall projecting from the substrate, but it can only be achieved by the determined wiring of a particular rod 8 between them.
    In each of these zones 34, 36 are arranged a plurality of electroluminescent rods of submillimetric dimensions, the rods associated respectively with each of these two zones being electrically connected so that the zones can be activated selectively, on either side of the separation. FIG. 2 shows the separation distance d3, in the first transverse direction, between a rod of the first zone 34 and a rod directly adjacent and of the second zone 36. It is agreed that this separation distance d3, measured between two longitudinal axes of electroluminescent rods, must be at least equal to 2 micrometers, so that the light emitted by the circumferential wall 28 of each rod 8 can exit the matrix of electroluminescent rods, and it seeks to have a separation distance d3 between two rods from two different sources that is substantially equal at the separation distance dl or d2 of two rods of the same zone of the light source.
    It is notable that the two zones of the semiconductor light source have distinct luminances, especially in the context of an application to a "bi-function" device, that is to say capable of performing two separate lighting functions. In the following description, it is more particularly an application in which the device can perform a first code-type lighting function and a second road-type lighting function. Several distinctions can be made between the two zones of the emitting surface, respectively associated with one or the other of the lighting functions, it being understood that in this application, it is desired that the activation of the first zone of rods 34 allow the realization of the first lighting function, that is to say the emission of a code beam, which therefore requires a moderate luminance but a strong flux, while the activation of the second zone of rods 36 allows the realization of the second lighting function, ie the emission of a road beam, which therefore requires a high luminance, but with a moderate flow. Without departing from the context of the invention, it can be provided that the second lighting function is performed solely by activating the second zone 36, while the first zone of rods 34 is extinguished, or that this second function lighting is achieved by the simultaneous activation of the first and second zones of rods, the activation of the rods of the second zone generating a complementary beam to the beam formed by the activation of the rods of the first zone to achieve by combining the beam road type.
    FIG. 5 shows, in dotted lines, the distribution curve 50 of luminance L to be observed on the source, as a function of the position relative to the center of the source, for obtaining a beam Road type respecting the regulations. It can be seen that the light intensity must be strong in the center of the source and gradually decrease towards the outside of the source. As illustrated, an approximation of this luminance distribution curve is made by different steps 52 which determine for a given area of the source a constant luminance value. An area of the light source as just presented, that is to say comprising a plurality of rods and as it has a luminance distinct from another zone of rods, is assigned a target luminance value corresponding to one of the steps. The area contained under the crenellated curve represents the installed power of the entire source, and it is understood that this installed power is optimized to meet the needs to obtain the regulatory luminance.
    Each zone is thus assigned a given luminance. It is understood that the luminance of a rod zone corresponds to the average luminance of each of the rods forming this zone. The luminance at a point, that is, a rod, can be defined as the average luminance of a group of rods immediately adjacent to that rod. FIG. 6 illustrates a case where the luminance L1 of a point centered on the rod b1 is determined by the average luminance inside the circle C1 centered on the rod B1 and comprising in this example five rods. It is understood that the luminance Ln of a point centered on the rod Bn is determined by the average luminance inside the circle Cn centered on the rod Bn. This eliminates the luminance variations of the rods with respect to the desired theoretical luminances, and it is thus possible to determine more reliably whether the luminance of one rod to the other is different.
    The density of electroluminescent rods with submillimetric dimensions 8 in each of the zones is advantageously different. It will be possible to provide a different, or substantially different, distribution of rods in each of the zones, or else an identical, or substantially identical, distribution of rods in each of the zones, the rods being able in this case to be electrically connected as a whole or not according to one area of the light source or the other. Advantageously, a higher density of electroluminescent rods is provided for the first zone 34, which is lit only when a road lighting function is necessary.
    The height of the rods 8 from one zone to another is also advantageously different. The light-emitting surface is thus modified by increasing the height of the circumferential wall 28 and the luminance of the first zone 34 is increased with respect to the second light zone 4 by increasing the height of at least one of the electroluminescent rods. submillimeter dimensions in this first zone 34.
    It will be understood that one of these options may be chosen to provide an area of the light source with a luminance that is stronger than the luminance of the other area of the light source 4, or that all of them can be used, it being understood that other means for playing on the luminance could be used.
    Advantageously, the substrate is common to all the rods composing the different zones of the semiconductor light source. The number of electrical connection wires is thus optimized, and the zones of the light source are brought closer to one another, the joined nature of this arrangement being particularly advantageous for obtaining a homogeneous flow when both zones of the semiconductor light source are activated simultaneously.
    Various embodiments of a light device comprising, on the one hand, a semiconductor light source comprising electroluminescent rods and, on the other hand, a projection optic capable of imaging at infinity at least a portion, will now be described. light rays emitted by the different rod zones of the light source, in order to generate at least two lighting and / or signaling functions.
    In FIGS. 2 and 7 to 9, the emitter zones are not the same size and they do not have the same number of electroluminescent rods of submillimetric dimensions. In the case illustrated in FIG. 2, where the light source has two zones of rods that are identifiable with the distinct luminance, the first zone 34 is larger than the second zone 36, at least in the direction of the optical axis 40 defined. previously, in a ratio ranging substantially from single to double. The two zones have a substantially rectangular shape, with a large side and a small side, and the areas are joined at one of their small side, which extends substantially perpendicular to the optical axis, in a provision of the so-called axial source, along the optical axis. By way of example, it can be provided that the first zone, that is to say the largest zone of the two zones of the light source, has a large side having a first dimension substantially equal to 4 millimeters and a small side having a second dimension substantially equal to 1 millimeter. It can be provided as an alternative embodiment that the zones are joined at one of their long side, in a so-called transverse arrangement of the light source.
    The different areas of the light source are selectively activatable from each other. In particular, it will be possible for one of these zones, when activated, to emit rays which form, after projection by the associated optics, a complementary beam of a projected beam when it is another zone of the transmitting part which is activated. The term "complementary beam" means a beam which, with another beam, forms a coherent beam when the zones are controlled so as to simultaneously produce the emission of the light beam of their own. These complementary beams are superimposed to form a regulatory light beam for a motor vehicle.
    FIG. 7 illustrates a particular embodiment of the invention according to which the semiconductor source comprises three zones ZR1, ZR2, ZR3 with variable luminance and the specific contours of which make it possible, by means of direct imaging, to a part of a beam, for example of the Route type. The three zones are concentric and arranged so that a first central zone ZR1 is successively surrounded by an intermediate zone ZR2 and an outer zone ZR3. In the case illustrated, the three zones are controlled simultaneously on and off, so that the addition of these three zones forms a global emitting zone ZR with variable luminance, the luminance varying from one zone to another such as previously stated, by densities and / or heights of sticks different from one area to another. It will be understood that the number of zones forming, in the specific case, the sub-zones of a global emitting zone that can be switched on or off, can be chosen according to the step-by-step cutting of the luminance distribution curve. to respect. Here, arbitrarily, the number of sub-areas is three.
    For the description of this case, an embodiment has been chosen in which the luminance is different from one sub-zone to another by different rod densities from one sub-zone to another. Thus, the rod density in the ZR1 subzone is larger than the rod density in the other subareas of the source, and the rod density in the ZR2 intermediate subzone is larger than the density of rods. rods in the outer subzone ZR3. As a result, the luminance of each sub-area is different from the luminance of the immediately adjacent sub-area (s). In particular, the luminance of the zone, or sub-zone, intermediate ZR2 has a value between the luminance value of the first zone, or central sub-zone, ZR1, and the luminance value of the second zone, or sub-zone outdoor area, ZR3. It can advantageously be provided that the density of the rods (or the height in the case where the luminance variation is obtained by different rod heights) within a sub-zone is not constant, and that the rods are arranged so that the luminance is variable gradually, see continuously from one sub-area to another. This is in particular obtained by the multiplication of subfields, in number greater than the number of zones theoretically determined by the number of approximation steps of the luminance distribution curve to be respected. For example, it is expected that the electroluminescent rods are grouped into at least ten distinct luminance zones.
    The fact of having a locally variable luminance source makes it possible to associate with this source a simple projection element, such as a convergent lens illustrated in FIG. 1. In the case illustrated, it is thus possible to carry out at least a portion of the beam lighting, here Road type, and it can be provided that the other beam parts or are made by other light devices, both devices comprising sources with electroluminescent sticks as more conventional sources such as diodes electroluminescent for example.
    A second and a third particular embodiment of the invention are illustrated in FIGS. 8 and 9. As it has been previously stated, it is advantageous to provide a first zone ZC ', ZC "of rods of the source corresponds to a Code zone, that is to say capable of transmitting a code-type beam, whereas a second zone ZR ', ZR "of rods of the source corresponds to a Route zone, that is, that is, capable of emitting a road-type beam. These two zones are selectively activatable from each other and it is planned to activate only the first zone ZC ', ZC ", called Code zone, to form a lighting light corresponding to a beam of light Code, that is to say a beam of dipped beam capable of not dazzle the occupants of another vehicle, and activate the two zones, the so-called Code zone and the so-called Route zone, to form a traffic light. street lighting, or full lights. In other words, a single zone of rods generates rays of light involved in the formation of a beam of low beam, while the two zones of rods together generate rays of light involved in the formation of a beam of light. high beam. One could also consider, as has been described above, a rods area is strictly associated with a first lighting function and the other rod area is strictly associated with a second lighting function.
    According to the second embodiment (FIG. 8), the semiconductor light source 1 comprises two transmitting zones ZR 'and ZC' which are selectively activatable and of different luminance. The shape of the second zone ZR 'is more centered so as to respect the shape to be given to the beam Route. When the two zones are activated simultaneously, a Route beam is thus formed and when the first zone ZC 'is activated alone, a Code beam is formed. It can be observed that the density on sticks is substantially the same from one zone to another, and that the overall luminance different from one zone to another is here obtained by heights of rods defining the first zone ZC 'different heights of the rods defining the second zone ZR '. It should be noted that the density of rods is not regular within each zone. Thus, substantially in the center of the source, rods of the first zone ZC 'are closer to each other forming a sub-zone ZC1' denser and therefore brighter than the rest of the first zone ZC ', and similarly, rods of the second zone ZC 'are closer to each other forming a sub-zone ZC1' denser and therefore brighter than the rest of the second zone ZC '.
    In the third embodiment illustrated in FIG. 9, these areas of high density of rods have been preserved, making them selectively activatable from the first zone ZC "and the second zone ZR". It is thus possible to perform an additional lighting function, in which the two intermediate zones ZM1 and ZM2 can be temporarily supercharged, while they can be undernourished when the first zone ZC "and the second zone ZR" are lit, in particular to present a constant light intensity, the undernourishment being necessary because of the greater density of rods that make up these intermediate zones.
    In order for the Code beam to be legal, the cutoff must have sufficient contrast. To this end, it is possible to provide a physical, non-emitting separation of the first zone 4 and the second zone 36, the separation being able to be formed by an opaque wall projecting from the substrate between the electroluminescent rods arranged at the edge of the each zone. This separation creates in the Route beam, obtained by the combined emission of the two zones 34,36 of the transmitting part, a zone darkened relative to the rest. In order to have a Route beam as homogeneous as possible, it is important that this darkened zone is reduced to the maximum, that is to say that the zones 34,36 are as close as possible and that the wall can have a height less than 0.1 millimeter, and preferably less than 0.05 millimeter.
    The present invention is particularly applicable to a front projector of a motor vehicle.
    The foregoing description clearly explains how the invention makes it possible to achieve the objectives which it has set itself and in particular to propose a light device which makes it possible to produce at least a low cost, and without loss of photometric quality, at least two lighting. -function, that is to say a different lighting with a single optical shaping. It will be understood that it has been more particularly described an application to a bi-function device making it possible to produce code-type lighting and road-type lighting, but that the device could easily be applied to perform different functions that may include a daylight function. It is particularly advantageous according to the invention to combine a semiconductor source comprising electroluminescent rods and a single projection optical element, that is to say for example a converging lens and / or a parabolic mirror. whose surfaces are not complicated to adapt and deform the source image. The use of electroluminescent rods and their arrangement in distinct luminance zones offers flexibility on the shape of the emitting zone, not necessarily rectangular, and on the local luminance of the emitter. It is appropriate to play for one on the electrical connection and / or the presence of rods, and for the other to provide specific heights and / or distribution density rods from one area to another.
    Of course, various modifications may be made by those skilled in the art to the structure of the light device which has just been described by way of non-limiting example, since it uses at least one semiconductor light source. electroluminescent rods comprising zones of distinct identifiable rods, in particular to easily play on variations in luminance from one zone to another. In any event, the invention can not be limited to the embodiment specifically described in this document, and extends in particular to all equivalent means and any technically operating combination of these means.
    权利要求:
    Claims (15)
    [1" id="c-fr-0001]
    A lighting and / or signaling device for a motor vehicle comprising a semiconductor light source (1) comprising a plurality of electroluminescent rods (8) of submillimetric dimensions, wherein the density and / or the height of the rods are adapted so that the light source has at least a first zone (34, ZR, ZR ', ZR1) and a second zone (36, ZC, ZC') defined by a plurality of rods and having luminances different from one another. zone to another, said device comprising a projection optics (2) adapted to image the light source on the outside of the vehicle.
    [2" id="c-fr-0002]
    2. Device according to claim 1, characterized in that the density and / or the height of the electroluminescent rods (8) are adapted so that the luminance is gradually variable from one area to another.
    [3" id="c-fr-0003]
    3. Device according to claim 1 or 2, characterized in that the density and / or the height of the electroluminescent rods (8) are adapted so that the luminance is continuously variable from one area to another.
    [4" id="c-fr-0004]
    4. Device according to one of claims 2 or 3, characterized in that the light source (1) comprises at least one group of electroluminescent rods (8) forming an intermediate zone (ZR2) arranged between the first (ZR1) and second (ZR2) zones, the density and / or the height of the electroluminescent rods of said intermediate zone being adapted so that the luminance of the intermediate zone has a value between the luminance value of the first zone and the luminance value of the second zone.
    [5" id="c-fr-0005]
    5. Device according to the preceding claim, characterized in that at least two intermediate zones (ZR2) are provided between the first (ZR1) and second (ZR2) zones, the density and / or the height of the electroluminescent rods (8) in each of these intermediate zones being adapted so that the luminance progressively changes from the first zone to the second zone.
    [6" id="c-fr-0006]
    6. Device according to one of the preceding claims, characterized in that each of the zones is configured for producing a lighting of a specific luminance, and distinct from the luminance of the zone (s) next (e) s.
    [7" id="c-fr-0007]
    7. Device according to one of the preceding claims, characterized in that the zones are selectively activatable from each other.
    [8" id="c-fr-0008]
    8. Device according to one of the preceding claims, characterized in that the electroluminescent rods (8) are grouped into a sufficient number of areas to achieve a light distribution of a regulatory beam can be imaged directly outside the vehicle by said projection optics.
    [9" id="c-fr-0009]
    9. Device according to any one of the preceding claims, characterized in that the first zone (ZR1) is arranged substantially in the center of the light source (1) and in that the second zone (ZR2) is peripheral to the zone Central.
    [10" id="c-fr-0010]
    10. Device according to any one of the preceding claims, characterized in that the first and second zones define an illuminating surface of the light source whose peripheral edge defines a contour of the light beam projected by the device.
    [11" id="c-fr-0011]
    A semiconductor light source comprising a plurality of submillimeter-sized electroluminescent rods (8), wherein the density and / or the height of the rods are adapted so that the light source (1) has a first and a second zone of rods whose luminance is variable from one zone to another.
    [12" id="c-fr-0012]
    12. Source according to the preceding claim, characterized in that the plurality of electroluminescent rods (8) forming the first and second areas protrudes from the same substrate (10).
    [13" id="c-fr-0013]
    13. Source according to one of claims 11 or 12, characterized in that the density and / or height of the rods (8) within the same zone is variable.
    [14" id="c-fr-0014]
    14. Source according to the preceding claim, characterized in that the density and / or the height of the rods (8) evolves in the same area progressively towards the other zone.
    [15" id="c-fr-0015]
    15. Source according to any one of claims 11 to 14, characterized in that the distance (dl, d2, d3) between two rods (8) immediately adjacent is at least equal to 2 micrometers.
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    同族专利:
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    引用文献:
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    法律状态:
    2016-08-31| PLFP| Fee payment|Year of fee payment: 2 |
    2017-02-10| PLSC| Search report ready|Effective date: 20170210 |
    2017-08-31| PLFP| Fee payment|Year of fee payment: 3 |
    2018-08-30| PLFP| Fee payment|Year of fee payment: 4 |
    2019-08-30| PLFP| Fee payment|Year of fee payment: 5 |
    2020-08-31| PLFP| Fee payment|Year of fee payment: 6 |
    2021-08-31| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1557619A|FR3039880B1|2015-08-07|2015-08-07|LIGHTING AND / OR SIGNALING DEVICE FOR MOTOR VEHICLE|
    FR1557619|2015-08-07|FR1557619A| FR3039880B1|2015-08-07|2015-08-07|LIGHTING AND / OR SIGNALING DEVICE FOR MOTOR VEHICLE|
    PCT/EP2016/068682| WO2017025439A1|2015-08-07|2016-08-04|Lighting and/or signalling device for a motor vehicle|
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