• 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:
    The present invention relates to a vehicle light device capable of emitting a light beam (F1, F2, F3) of white color, the light device comprising: light-emitting means of white light beam, at least one connecting means connected to these transmission means and intended to be connected to an electrical power supply (A) for powering them electrically, the transmission means and at least one connection means being arranged in such a way as to be able to confer on the different light beam white colors according to the power supply received by the connection means.
    公开号:FR3041576A1
    申请号:FR1559083
    申请日:2015-09-25
    公开日:2017-03-31
    发明作者:Pierre Albou；Vanesa Sanchez
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    DEVICE AND METHOD FOR CONFERING DIFFERENT WHITE COLORS TO A BRIGHT BEAM
    The present invention relates to the field of vehicle light devices emitting white light beams comprising several parts, including light beams of road lighting.
    It is known to produce white light beams with vehicle light devices. It is common to seek to improve the perception of these beams or the effectiveness of these.
    In particular, it is known light beams of the road to illuminate the latter and the different areas of this road. The illumination beam comprises parts of different luminosities and with different contours. For example, in the case where this beam is a dipped beam, the latter includes a horizontal cutoff line on the left so as not to dazzle the drivers coming in the opposite direction or being followed. It also includes a part on the right with an oblique cut line, which goes up towards the outside of the beam to illuminate the aisles.
    In the context of lighting beams, the evolution of the technique aims constantly to improve the perception of the driver of the road. This perception is improved in particular by using more powerful, more homogeneous, and / or wider lighting. Also when darkness makes it difficult to distinguish certain night objects especially on the aisles, it was developed road vision systems emitting infrared rays coupled to an infrared camera restoring an image on a screen. Other improvements have also focused on how to make the cut lines, for example by creating sharp cut lines, without being too marked however so as not to interfere with the driver.
    In addition, some of the crossing beams have more irregularities, such as a separation of colors at the cutoff lines. These colors are perceived as anomalies, also the state of the art includes different solutions to avoid or compensate for this separation of color.
    A problem addressed by the present invention is therefore to further improve the perception of night with white light beams, including lighting beams of the road.
    The Applicant has found that by using beams of light with different white color parts, the perception for the driver was greatly improved.
    Also a first object of the present invention is a vehicle light device capable of emitting a white light beam, said light device comprising: means for emitting the light beam of white color, at least one connected connection means to these transmission means and intended to be connected to a power supply for electrically powering said transmission means, the transmission means and the at least one connection means being arranged so as to confer on the light beam different colors white according to the power supply received by the connection means.
    By "conferring on the beam different white colors" means that: the beam may comprise different parts of different colors, and / or the beam is of one color at a time but this color is capable of being modified.
    The device according to the invention thus increases the visibility according to certain sectors of the road or the environment thereof.
    The light device according to the invention may optionally include one or more of the following features: the luminous device comprises a control means able to receive a control signal and arranged to be able to send different supply currents to the at least one means; connection according to the control signal; thus the control of the transmission means is carried out directly in the light device; - The light device is a road lighting device, including a projector; the light device comprises a shaping optics, in particular one or more reflectors and / or one or more lenses, arranged to project the image of the transmitting means, so as to form the light beam, the light beam being a lighting beam of the road, such as a passing beam, a motorway light, a fog lamp or a road light; the transmitting means and the connecting means are arranged in such a way as to be able to give the light beam distinct parts each having a different white color; this applies to different types of light beams; according to an embodiment of the preceding paragraph, the light device is a projector and the light beam is a lighting beam of the road; the plaintiff noticed that, surprisingly, certain colors favored visibility according to the part of the road they illuminated, in particular certain white colors with a given shade; this option corresponds to shades of white allowing better visibility in these traffic conditions; according to an embodiment option, the separate parts referred to in the preceding paragraph correspond to lateral parts of the lighting beam, at least one lower part intended to illuminate below the cut-off height and, possibly, at least one upper part intended to illuminate above the cutoff height; this makes it possible to have different colors according to the parts of the road and in particular respectively, on the aisles, on the road and above the road; this allows the driver to better distinguish these different parts; the cut-off height corresponds to the height above which the spokes are dazzling for the drivers of other vehicles coming in the opposite direction; in a low beam the horizontal cut-off line is placed at this height; according to an embodiment of the preceding paragraph: o the lateral parts have a white color with a shade of green, where the at least one lower part has at least part of a neutral white color or with a shade of blue, the at least one upper part has at least part of a white color with a shade of yellow; surprisingly, the Applicant has found that these colors particularly enhance visibility on these categories of road sector and its environment; the transmission means and the connection means are arranged in such a way as to be able to confer on the light beam a uniformly distributed color on this beam, the latter being able to take uniformly one of the said different white colors according to the power supply received by the said at least one connection means; thus the light beam can take a given white color or another given white color according to a received power supply; the beam is thus adaptable in overall shade of white; for example, some colors may be more appropriate depending on the environment of the road; also depending on the chosen white color, the beam can be more relaxing and help the driver in his driving; the transmission means comprise: o several distinct light zones, at least one light zone being arranged in such a way as to emit light rays of a white color different from that of the light rays emitted by at least one other light zone, o optical shaping, able to receive the light rays emitted by the light areas and deflect them out of the light device so as to form said light beam; this embodiment of the invention makes it possible to simply obtain different white colors for the same beam; the light zones are distributed in a light group, each of these groups comprising at least two light zones, in particular arranged in an adjacent manner, and each light zone of each of the light groups being able to emit a color different from that of the other light areas of the light group. same luminous group are able to emit; it is an embodiment in which a finer discretization of the light source is obtained; according to an embodiment of the preceding paragraph, the light beam is a lighting beam and each of these groups comprises at least three light areas; this allows to illuminate with a good color rendering index or CRI; the arrangement of the light zones is identical in at least two or even in each of the light groups; a pixellisation of the light source is thus obtained, thus making it possible to produce a light beam in which the parts of different colors can be adapted; the light groups are arranged in rows and columns. ; This allows easier control of the light areas to form a pattern; the rows and the columns comprise a sufficient number of light groups so that at least one pattern of part or all of a light beam of the road can be achieved by the plurality of light areas; this makes it possible to have a luminous pattern which once sent on the road, in particular by means of reflection and / or projection, will give a light beam with a photometric distribution required for this beam, thus forming part or all of a lighting beam; in the case where the light areas are those of a single light source with several light rods extending from the same substrate, as mentioned below, the at least one pattern is formed on the light source directly; each of the light groups comprises only a first, a second and a third light zone, emitting, when they are electrically powered, light rays of respectively red, green and blue color; light groups forming RGB sources are thus obtained, which makes it easier to adjust the color emitted at a light group; for example, this makes it possible to obtain different colors of white, namely whites with different shades; the light zones are formed by different light-emitting sources, in particular by different light-emitting diodes or by electroluminescent elements different from at least one same light-emitting diode; - The light device comprises a light source comprising a substrate from which extend several rods of light emitting semiconductor material, all of these rods being distributed in zones forming said light areas; this embodiment of the invention allows with a single light source to obtain different white colors for the same beam; the rods have a thickness of between 0.1 and 2 μπι, in particular between 1.4 and 1.6; this makes it possible to increase the light emitting surface and confers more brightness to the light source; the rods have a height greater than 2 μm, for example between 2 and 10 μm; this makes it possible to increase the light-emitting surface and confers more brightness to the light-rod source; the sticks are encapsulated in silicone at least partially covering the sticks; the rods are separated from each other by a distance between 1 and 35 μm, preferably between 3 and 30 μm, preferably between 20 and 30 μm; the maximum of distance corresponds to a minimum of density in sticks; although this maximum is not limiting, it confers better results in terms of brightness, especially for the automobile; the minimum of 1 pm allows easier realization of these light sources, in particular the growth of rods; nevertheless, when the sticks are too dense, the emission of certain sticks may be hindered by the presence of other sticks, which screen it; the efficiency of the light source is significantly improved with a distance of at least 3 μm; the efficiency reaches a particularly interesting value with a distance of at least 20 μm; the optimal interval, in terms of compromise with respect to the efficiency and brightness, is between 20 to 30μπι; this interval is however not limiting; the rods extend from a substrate, especially in a preferred direction; the rods comprise a metal nitride, in particular a gallium nitride, and / or the substrate is essentially based on silicon; nitrides of metal and in particular gallium make it possible to obtain good results in terms of light emission; silicon makes it possible to produce a light source, and therefore a light device, which is less expensive than conventional LEDs; the light source is arranged so that said light areas are selectively activatable; and the light areas are able to be supplied with electricity independently of each other and that the rods of the same light zone are electrically powered when the light zone is electrically powered; the different light areas are thus able to be controlled independently, in particular to vary the shape of the parts of the beam of different colors and / or their colors; the light source comprises a single connection means; the light source can thus receive the power supply of the different zones from a single point of connection; the substrate comprises a cathode connected to or forming a negative pole of said connection means; it is a simple connection of the light source; the light source comprises at least as many anodes as light areas, each anode being arranged to be in contact with each of the rods of one and the same light zone, in particular each anode being connected to one or more positive terminals of the connecting means or each forming a positive terminal of the connection means; it is an example of a compact and simple embodiment of the connection of each light zone, compactness all the more improved when the anodes are connected to the same connection means; each anode is formed by a conductive layer deposited on top of the substrate, on the rod side, and electrically joining the rods to each other; it is an example of a more compact embodiment of the light source; the luminous device comprises a control means of the different light zones arranged to independently supply the light areas according to a received control signal; thus this control means is included directly in the light device, without it being necessary to adapt the support or the global device that receives it; the light source comprises a layer of a luminophore arranged above the rods so that the phosphor receives the rays emitted by the rods and in turn emits light rays, corresponding to the light rays emitted by the corresponding light zone, and the control means is adapted to adjust a modulated voltage supply of at least two light zones, in particular by adjusting the average voltage value and the maximum voltage amplitude value differently in these two light zones, so as to the colors emitted by these two light zones are different; alternatively, the power supply can be modulated in current, instead of being modulated in voltage, in particular by adjusting the average current value and the maximum current amplitude value differently in these two light zones, so that that the colors emitted by these two luminous zones are different; the chemical composition of the rods of at least one light zone differs from the chemical composition of the rods of at least one other light zone, so that the rods of the at least one light zone emit light rays of a a color different from that of the light rays emitted by the rods of the at least one other light zone; each light zone comprises a layer of a luminophore arranged above the rods so that the phosphor receives the rays emitted by the rods and in turn emits light rays, corresponding to the light rays emitted by the corresponding luminous zone, at least two light zones differing from one another by: the chemical composition of their rods, the chemical composition of their phosphor layer, and / or the thickness of their phosphor layer; - The rods of the first, second and third light areas have chemical compositions different from each other, so that these rods emit light rays respectively red, green and blue color when electrically powered; it is a means of realization of the RGB colors; it is particularly useful in the embodiments of the invention where the light areas are distributed in a light group; this makes it possible to easily form patterns in various colors; each light zone comprises a layer of a luminophore arranged above the rods so that the phosphor receives the rays emitted by the rods and in turn emits light rays, corresponding to the light rays emitted by the corresponding light zone; , the phosphor layers of the light zones of each light group being of different chemical compositions, so that each light zone of the same light group has a different white color; the phosphor layers of the different light zones have chemical compositions different from each other, so that: a first light zone whose phosphor layer has a first chemical composition emits light rays of a white color with a shade of green, o a second luminous zone whose phosphor layer has a second chemical composition emits light rays of a white color with a shade of yellow, o a third luminous zone whose phosphor layer has a third chemical composition emits luminous rays of a white color with a shade of blue; each light zone comprises a layer of a luminophore arranged above the rods so that the phosphor receives the rays emitted by the rods and in turn emits light rays, corresponding to the light rays emitted by the corresponding light zone, in which the phosphor layer on the rods of each light zone of the same light group, or even of the entire light source, forms a single phosphor layer, in particular of constant thickness, and in which the rods of the different zones different light compositions have different chemical compositions from each other, so that each light group comprises: o a first light zone whose rods have a chemical composition enabling them to emit light rays of violet color, so that this luminophore emits luminous rays of a white color with a shade of green, o a second luminous zone whose stems o nt a chemical composition allowing them to emit light rays of blue-green color, so that this luminophore emits rays of light of a white color with a shade of yellow, o a first zone in luminous whose stems have a chemical composition enabling them to emit light rays of blue color, so that this phosphor emits light rays of a white color with a shade of blue; this allows a simpler realization of the recovery of the rods by a luminescent material, in particular by deposition; each light zone comprises a layer of a luminophore arranged above the rods so that the phosphor receives the rays emitted by the rods and in turn emits light rays, corresponding to the light rays emitted by the corresponding light zone, in which the phosphor layer on the rods of each light zone of the same light group, or even of the entire light source, forms a single phosphor layer, each luminous group comprising: a first light zone whose light layer; phosphor has a first thickness such that this phosphor emits light rays of a white color with a shade of green, o a second light zone whose phosphor layer has a second thickness such that this phosphor emits light rays of a color white with a shade of yellow, o a third light zone whose phosphor layer has a third thickness such that this luminaire ophore emits light rays of a white color with a shade of blue, the second phosphor thickness having a value greater than the value of said third phosphor thickness, said first phosphor thickness having a value between that of the third thickness and that of the second thickness; this allows a simpler realization of the light source, which can thus have rods of the same chemical composition, for example rods emitting light rays of blue color; the production of the phosphor layer can be easily performed by molding or by successive deposits with caches; the phosphor layers have the following thicknesses: the phosphor layer of the first zone has a thickness of about 390 μm, the phosphor layer of the second zone has a thickness of about 325 μm, the phosphor layer of the first zone has a thickness of about 260 μm. The invention also relates to a road lighting system comprising: a light device according to the invention, the transmission means comprising: a plurality of distinct light zones distributed in a light group, each of these groups comprising at least three luminous zones, for each of the light groups, each light zone being able to emit a color different from that which the other light zones of this light group are able to emit, and a shaping optics, able to receive the light rays. emitted by said light areas and deflecting them out of the light device so as to form said light beam, - a means for controlling said light areas, - an image sensor of the road in front of the vehicle, - a calculator able to identify at inside this image several portions corresponding to categories of sectors of the road and its environment, and to send a s ignal corresponding to said control means so that said light areas are fed in a different way according to the different light groups, so that several sectors of the road and its environment of a different category are illuminated, at least a plurality of said illuminated areas being illuminated with a different color; we thus have a beam adaptable to the road and its environment; the light device may comprise the image sensor and / or the computer and / or the control means.
    According to one embodiment of the invention, the lighting system according to the invention may comprise: - a light device according to the invention, - a means for controlling the light source, - activation means adapted to transmit by means of different signals corresponding to different lighting modes, the control means being able to feed differently the light zones according to the received signal, so that the light beam can take different data patterns of different white colors depending on the received signal .
    According to the embodiment referred to in the previous paragraph, there is thus a light beam which may have different shades of white depending on the mode chosen. The mode can be chosen by the driver, in particular at a switch having as much position as possible lighting modes, or determined by a computer that based on information received, for example from the navigation system, of a means giving the speed of the vehicle, determines on which type of road rolls the vehicle. The invention also relates to a vehicle comprising a light device or a lighting system according to the invention, in particular connected to the power supply of the vehicle. The subject of the invention is also a method of a light device, the light device being able to confer on the light beam that it emits different white colors, this method comprising: a step of sending a light signal; control according to a given road configuration, o a step of determining the white color (s) to be conferred to the light beam according to this given road configuration, o a control step of the device so that it emits the light beam with the selected white color (s).
    The method of the invention thus increases the visibility according to certain sectors of the road or the environment thereof.
    The control method according to the invention may optionally comprise one or more of the following characteristics: the luminous device is able to emit different categories of light beams, and in which, during the control step, this luminous device is controlled in such a way that for the light beams of the same category, the light beams have a different arrangement of white color (s); in particular, these categories of beams include light beams whose photometric distribution is identical in terms of intensity; these categories may be chosen from: a category of road beams, a category of low beam, a category of motorway lights, a category of fog lamps; each category of light can be adapted to the road configuration to have better visibility; the light device comprises several light zones, the control step comprising a substep of selecting the light zones to be electrically powered according to the selected white color configuration; a single white color is selected according to the given road configuration, the light device being controlled so that the light beam has uniformly the selected white color; surprisingly, the applicant has found that some colors favor the visibility according to the part they illuminated, especially certain white colors with a given shade; the white color is selected so that the light beam has: o a white color with a shade of green, when the vehicle is traveling in the countryside, o a neutral white color or with a shade of blue, when the vehicle is on the highway , o a white color with a hint of yellow when the vehicle is traveling in town; this embodiment corresponds to shades allowing better visibility in these traffic conditions; this embodiment allows a simple implementation with a limited number of white color configurations; the method comprises the following steps: o capture an image of the road in front of the vehicle, o identify inside this image several portions corresponding to categories of sectors of the road and its environment, o select the light areas to feed electrically so that the light areas are fed in a different way, so that several sectors of the road and its environment belonging to a different category of sectors are illuminated, at least several of said illuminated areas being illuminated with a different color; this method makes it possible to adapt the light beam by conferring on it different parts of different colors, so that these parts are superimposed on the different categories of sectors; it thus makes it possible to optimize the visibility according to the evolution of the road and its environment, in particular as real; the light areas are fed in such a way that the lighting beam: o has at least a part of a white color with a shade of green illuminating the sides of the road, o has at least a part of a neutral white color or with a shade of blue illuminating the road surface, o has at least a portion of a white color with a hint of yellow over the road and / or aisles; surprisingly, the Applicant has found that these colors particularly enhance visibility on these categories of road sector and its environment; the light beam comprises distinct parts corresponding to lateral parts of the illumination beam, at least one lower part intended to illuminate below the cut-off height and, optionally, at least one upper part intended to illuminate above the height of the light beam; cutting, the light areas being fed so that the white color of each part is different; this makes it possible to have different colors according to the parts of the road and in particular respectively, on the aisles, on the road and above the road; this allows the driver to better distinguish these different parts; the luminous areas are fed in such a way that: o the lateral parts are white in color with a shade of green, where the at least one lower part has at least part of a neutral white color or with a shade of illuminating blue the road surface, where the at least one upper portion has at least a portion of a white color with a shade of yellow above the road and / or aisles; Surprisingly, the plaintiff noticed that certain colors favored visibility according to the part they illuminated, in particular certain white colors with a given shade; this embodiment option corresponds to shades of white allowing better visibility in these traffic conditions; the light device is a light device according to the invention. Other features and advantages of the invention will appear on reading the detailed description of the following nonlimiting examples, for the understanding of which reference will be made to the appended drawings, in which: FIG. 1 represents a perspective view of means of emission, such as those included or used in the various objects of the invention; Figure 2 shows a schematic sectional view of Figure 1 along the axis AA; FIG. 3 shows the projection on a vertical screen, particularly at 25 meters, of a road beam emitted by a vehicle light device according to the invention and comprising the transmission means of FIG. 1; FIG. 4 shows the projection on a vertical screen, particularly at 25 meters, of a passing beam emitted by a vehicle light device according to the invention and comprising the transmission means of FIG. 1; FIG. 5 represents a group of transmission means comprising the transmission means of FIG. 1; Figure 6 shows a color chart defining an area encompassing the different shades of white; Figure 7 shows an environment of the road seen from the driver's seat of the vehicle, with schematic landmarks; FIG. 8 represents the projection on a vertical screen, notably at 25 meters, of a road beam emitted by a vehicle light device adapted to the environment of the road of FIG. 7; FIG. 9 represents transmission means according to another embodiment; FIG. 10 represents a light device according to the invention.
    FIG. 10 illustrates an exemplary light device D of a vehicle according to the invention. This light device D is a projector capable of emitting a white light beam.
    The light device D comprises a housing B closed by a transparent glass G, thus delimiting an interior volume. Inside this volume, there is arranged a light source S which, in this example, comprises all of the transmission means capable of generating the light rays r1, r2, making it possible to form a beam of white color.
    The light device D comprises at least one connection means C connected to the light source S and intended to be connected to a power supply A for supplying power to the emitting means of the light source S.
    The transmission means and the connection means C are arranged so as to confer on the light beam different white colors according to the power supply received by the connection means.
    In this example, the interior volume comprises a shaping optics 0 arranged to project the image of the transmitting means, so as to form the light beam. In this example, this optic 0 is a convergent lens focused on or slightly behind the light source S.
    FIG. 1 illustrates a light source S comprising three light zones 1, 2, 3. In this example, these three light zones 1 to 3 are the transmission means.
    Figure 2 is a section along AA of the light source S.
    In this example, the light source S is a rod light source.
    The light source S comprises a substrate 10 from which, in a preferred direction, sticks 11, 12, 13 distributed in a first light zone 1, a second light zone 2 and a third light zone 3 respectively extend.
    This substrate 10 is, especially in this example, silicon, which represents a much lower cost than conventional LEDs, in which the substrates are sapphire. The rods 11, 12, 13 may be obtained by crystalline growth on this substrate 10.
    The rods 11, 12, 13 are arranged to form rods of electroluminescent semiconductor material. The rods 11, 12, 13 may for example be formed essentially of gallium nitride.
    For example, these rods 11, 12, 13 comprise a core of semiconductor material capable of being doped with electrons, around which is formed a first layer of semiconductor material capable of having electron deficits, in which case sometimes speaks of doped layer in "holes" or positive charges. At the interface of this soul and this first layer, an intermediate layer is formed where the electrons and the electron deficits are recombined. Thus, each rod 11, 12, 13 is an electroluminescent semiconductor element.
    A nucleation layer 19 is formed on the substrate 10 and around the rods 11, 12, 13.
    The rods 11, 12, 13 are here at a distance of about 30 μm and each have a height, taken from the nucleation layer 19 to their apex, of 2.5 μm. Their thickness, which corresponds here to the width of the rods in FIG. 1, is 1.5 μm. Note that Figures 1 and 2 are schematic; the scales should not be taken into consideration between the different elements.
    The light source S therefore essentially comprises a substrate 10 forming a plate bristling with a multitude of small rods 11, 12, 13 electroluminescent and submillimetric, namely whose largest dimension is less than one millimeter.
    Between each rods 11, 12, 13 of the same zone 1, 2, 3 is deposited an electrically conductive layer, electrically joining these rods, thus forming a separate anode 25, 26, for each of the three light zones 1, 2, 3 .
    The three anodes 25, 26 thus formed are in contact with the nucleation layer 19, which itself is in contact with the cathode formed by the substrate 10.
    Thus, by connecting the anodes 25, 26 and the cathode 10 to a power source, each of the different light zones 1, 2, 3 can be independently supplied with electricity.
    According to an embodiment of the invention, each anode is connected via electrical conductors 31, 32, 33, to one or more positive terminals of an activation means 20, intended to be connected to the positive terminal of the source of power. power supply of the vehicle. Similarly, the cathode 10 is connected via an electrical conductor 34 to the negative terminal of the activation means 20. The activation means therefore allows the power supply of each of these light areas 1, 2, 3.
    The light source S is therefore suitable for each of its light zones 1, 2, 3 to be selectively supplied with electricity, in particular by the activation means 20. It is therefore possible to control this light source S by selective activation of its areas.
    The control can be achieved by a specific means separate from the light device, or, as in this example, by a control device integrated in the light device.
    In this example, the control is carried out directly by the activation means, which thus forms a control device 20. The latter is connected on the one hand to each anode 25, 26, via the electrical conductors 31, 32, 33, 34 and on the other hand to a connector C, intended to be connected to the electrical power supply K of the vehicle via an electric harness 35.
    The connector C, the control device 20 and the light source S are for example mounted on the same printed circuit board (not shown). The electrical conductors 31, 32, 33, 34 are formed by electronic tracks of this card. Likewise, other electronic tracks connect the control device 20 to the connector C.
    The light zones 1, 2, 3 can be made brighter by depositing a reflecting layer 17, 18 on the nucleation layer 19. This reflecting layer 17, 18 is for example deposited on the nucleation layer 19 before growth of the rods , then holes are formed in this reflecting layer 17, 18, as well as in the nucleation layer, before growth of the rods 11, 12, 13 on the substrate 10.
    For a higher performance brightness, especially in the context of the luminous device D, the rods of the light areas may have the following characteristics: a thickness of between 1.4 and 1.6 μπι, for example 1.5 μm, a height of between 2 and 3 μπι, for example 2.5 μπι, a distance between each rod of between 20 and 30 μπι, for example 30 μπι.
    According to one embodiment of the invention, it is based on a rod light source by arranging it to have selectively activatable zones.
    The light device D makes it possible to generate a light beam, such as for example a road beam.
    The rods 11 of the first light zone 1 are arranged to emit a white color with a shade of green.
    The rods 12 of the second light zone 2 are arranged to emit a white color with a shade of yellow.
    The rods 13 of the third light zone 3 are arranged to emit a white color with a shade of blue.
    In general, in the present application, and in particular in the examples illustrated, the white colors, the luminous device, the lighting system and / or the control method according to the invention can be defined according to CIE 1931 standards.
    For example, the different white colors, in particular those mentioned above, may be within the zone defined by the following limit lines in the coordinate diagram (x, y) of the CIE 1931 standards, illustrated in FIG. 6: the so-called green limit (W12) of equation: y = 0.150 + 0.640 x the yellowish green boundary (W23) of equation: y = 0.440 the so-called yellow limit (W34) of equation: x = 0.500 the so-called red violet limit (W45) of equation: y = 0.382 the so-called violet limit (W56) of equation: y = 0.050 + 0.750 x the so-called blue limit (W61) of equation: x = 0.310.
    These different colors correspond to white colors of different shades of white.
    Notably, different white colors have non-intersecting MacAdam ellipses.
    The shades of the whites mentioned above are therefore more or less close to certain limit lines depending on the chosen shade. For example: the white with a shade of yellow is closer to the so-called yellow limit, the white with a shade of blue is closer to the so-called blue limit, the white with a shade of green is closer to the so-called green limit .
    According to one embodiment of the invention, the light zones 1 to 3 are arranged with the shaping optics 0 so that the rays emitted by the light zone or zones emitting light rays of identical white color all form together, after deviation by the shaping optics 0, a complete illumination light beam.
    For example, the driver or control device 20 may send a control signal to activate the one or more light areas to generate a given white color.
    For example, when the driver is driving on a country road, he can use a selection interface to choose a white color with a shade of green. Indeed, it will allow him to better perceive the elements of the road environment that are essentially green. The Applicant has indeed noticed that in such a case, the aisles and the elements therein were better perceived by a white light with a shade of green.
    According to an exemplary method according to the invention, when the driver makes this selection, the control signal is sent to the control device, which selects and activates the required light zone (s), here the first light zone 1, by feeding it electrically.
    In this example, the light beam has a uniform color of a white with the chosen shade.
    The present application is not limited to a road beam, which is a long-worn beam. It can be applied to other lighting beams of the road such as a low beam, a motorway light, a fog light or a fire.
    According to another embodiment of the invention, the light areas 1 to 3 are arranged with the shaping optics 0 so that several light zones capable of emitting light rays r 1, r 2 of different white colors together form a beam of light. road lighting.
    FIG. 3 illustrates an example of a road beam Fl generated by the light zones 1 to 3. FIG. 3 represents the projection on a vertical screen, notably at 25 meters, of the road beam F1, with also the representation of the horizon H and a vertical axis V, intended to be centered generally in front of the vehicle.
    This lighting beam comprises two lateral parts, referenced 61 for one and 61 'and 61 "for the other, having a white color with a shade of green, a lower part 63 intended to illuminate below the cutoff height. h and having a neutral white color or with a shade of blue, and an upper portion 62 for illuminating above the cutoff height h and having a white color with a shade of yellow.
    Thus, the side portions 61, 61 'and 61' 'of the road beam Fl are particularly suitable for illuminating vegetation areas on the side of the road. The lower part 63 of the beam is particularly adapted to illuminate a bitumen area of the road. The upper portion 62 is particularly suitable for illuminating an area located above the bitumen and / or road signs. Indeed, the Applicant surprisingly found that these colors particularly enhance the visibility on these road sectors and its environment.
    The lateral portions 61, 61 'and 61' ', the upper part 62 and the lower part 63 are respectively formed by the rays initially emitted by the rods 11, 12 and 13 of the first light zone 1, the second light zone 2 and the third light zone 3.
    Thus, when the driver or a computer sends an activation signal of the road beam Fl, the control device activates the light areas 1 to 3.
    According to another embodiment of the invention, the rod light source and the shaping optics are arranged,
    According to another embodiment of the invention, the rod light source and the shaping optics are arranged so as to form a passing beam, as illustrated in FIG. 4.
    This passing beam F2 similarly comprises the beam F1 of FIG. 3, a lower portion 63 and lateral portions 61 and 61 '.
    The lateral portion 61 'on the left is delimited in the upper part by a cutoff line 64 located at the cutoff height h. Similarly, the lower portion 63 is delimited in height by a horizontal cutoff line 65 located at the cutoff height h. On the other hand, the right lateral part 61 has an oblique cut 66, which rises to the right in order to illuminate on the aisles.
    In this example, the lower part 63 and the right lateral part 61 of the passing beam F2 are respectively identical in shape and in color to the lower part 63 and the right lateral part 61 of the road beam F1 of FIG.
    According to another embodiment, the light source comprises at least five light zones so as to form a road beam such as that Fl in FIG. 3 and also a passing beam such as that F2 in FIG. For this, the distribution, not shown, of the five light zones is arranged to form the different parts of the emitted light beam, so as to achieve a first configuration corresponding to the road beam Fl and a second configuration corresponding to the passing beam F2 .
    For example, at least three light areas are able to form and emit white rays with a shade of green, to form the side portions 61, 61 ', 61' '. The upper 62 and lower 63 parts of the road beam are each formed by a bright areas as in the previous embodiment.
    Thus, when the driver activates the driving beam, all the light zones are activated and all the parts of the corresponding light beam, 61, 61 ', 61' ', 62, 63, are formed in such a way that the road beam is obtained. fl.
    On the other hand, when the driver activates the passing beam, in order not to dazzle the passengers arriving in front of him, a control signal is sent to the control device 20, which then deactivates the light zone (s) allowing the formation of the part. high 62 of the beam, and the light zone for the formation of the left side part 61 '' above the cutoff height h. Therefore, only the right lateral part 61, the lower part 63 and the left lateral part 61 below the cut-off height h are lit, thus forming the passing beam F2.
    One can thus have a projector D which with a single source forms both the passing beam and the road beam, while providing its two beams of the arrangement in separate parts, these parts having different shades of white.
    It is still possible to further improve the adjustment of the different parts of distinct colors within the light beam. Such an improvement is described hereinafter with reference to FIGS. 5, 7 and 8.
    As can be seen in FIG. 5, the light source can comprise several groups G11, G12, G21, G22. The light areas are distributed among these groups.
    In this example, each of these groups has an identical distribution of rods and light areas. For the sake of clarity only the first group G11 has been shown. The structure of this first group corresponds to that of the light zones of FIG. 1. Thus each group G11, G12, G21 and G22 comprises three light zones 1, 2 to 3, able to emit respectively green, yellow and blue color rays. .
    Moreover, in this example, the source S has as many anodes as there are groups G11, G12, G21, G22 and only light zones 1, 2, 3. Each light zone is thus connected to the control device 20 by tracks. 31, 32, 33, 42, 52, 62. For the sake of clarity, only one connection track 42, 52, 62 has been shown for each group G12, G21 and G22, although there are three these groupings.
    The light source may comprise only a connection track 34 connected directly to the cathode, which is formed by the substrate 10.
    The light source S may comprise a plurality of these groups arranged in rows and in columns. Each group thus forms a pixel, whose control device 20 is able to choose the hue of the white color according to the activated light zone.
    The light device can be connected for example to a camera (not shown) which records an image of the road environment. By way of example, FIG. 7 illustrates an image R of this road environment. The dots represent the volume illuminated by the lighting beam of the road.
    This image shows several sectors of the road environment: the aisles on either side of it, with a road sign on the right, as well as an area above the road between aisles.
    The camera is connected to a computer, which processes these images, in the example of Figure 7, the image R. The computer defines different sectors in the image.
    For example, by recognizing in a known manner the demarcations on the ground, it defines the sector corresponding to the bitumen. It can also thanks to the lines of the relief near to define the aisles and the zone located above. It can also define areas corresponding to road signs.
    Then, the computer identifies the groups G11, G12, G21, G22, corresponding to these sectors, for example so that the sector division of the image R corresponds to a division into sectors of the light source.
    The calculator also identifies which color is to be assigned to each of these groupings according to the sector of the light source to which they are attached.
    Then, the computer sends to the control device, the instructions for defining which light zone 1 to 3 of each group G11, G12, G21 and G22 must be activated so that each group emits the color corresponding to the sector with which it is associated. The optical shaping project then the image of the light source on the road, in particular in the same direction as the shooting of the camera.
    For example, the image R is projected so that if a vertical screen was placed in front of the vehicle, as shown in FIG. 8, the distribution of the portions of the beam F3 on this screen would correspond to the sectoring carried out on the screen. image R received by the computer. As a result, the parts of the beam will correspond to the road environment.
    Thus, in FIG. 8, it is possible to observe a projection of the beam on a screen 25 meters from the beam F3 generated according to this embodiment. In this beam F3: - side portions 161 and 161 'are projected on the relief of the aisles; these side portions 161 and 161 'are white with a green hue; they are generated by the activation of the first light zones 1 of the groups selected by the control device 20 as corresponding to the sectors associated with the aisles; a lower part 163 projects on the bitumen; this low lateral part 163 is white with a blue hue and is generated by the activation of the third light zones 3 of the groups selected by the control device 20 as corresponding to the sector associated with the bitumen; an upper part 162, which is white with a yellow hue, projects above the aisles and the bitumen; this upper part 162 is white with a yellow hue and is generated by the activation of the second light zones 2 of the groups selected by the control device 20 as corresponding to the sector above the aisles and the bitumen; an additional part 167, which is also white with a yellow hue, projects onto a traffic sign; it is generated by the activation of the second light zones 2 of the groups selected by the control device as corresponding to the sector defined by the panel.
    It then becomes possible to reinforce the visibility of certain sectors of the road or the environment thereof, by adapting the hue of a portion of the light beam to the sector of the road or to the part of the illuminated environment ( e).
    In the preceding examples the rods emit rays whose color corresponds to that emitted in the beam at the output of the light device. However, other solutions are possible, such as those mentioned in this application before the description of the figures.
    For example, as illustrated in FIG. 9, a first light zone 201 and a second light zone 202 each emit a different color, while the rods, respectively 211 and 212, of these zones emit the same color, for example a blue color.
    For this, the rods 211, 212, of the entire light source are covered with a phosphor layer 241, 242. This phosphor after absorption of blue light rays reemets white rays.
    The phosphor layer has a different thickness depending on the light areas, thus allowing the light areas above which the phosphor thickness is identical to emit a white color with the same given hue.
    For example, below a certain thickness, the phosphor will be saturated by the emitted rays, and all will not be converted. The white light emitted will then have a blue hue. Above a certain thickness, almost all emitted rays will be converted. The white light emitted will then have a yellow tint. With an intermediate thickness, the white light emitted will have a green hue.
    In the example illustrated in FIG. 9, the phosphor layer above the rods 211 of the first light zone 201 has a thickness 241 such that the outgoing light rays emitted by the first light zone 201 are of a white color with a green tint. . Thus, when the control device 220 activates the first light zone 201 by feeding, via the anode 225 and the electronic track 231, this first light zone 201 emits a white color with a green tint.
    Similarly, when the control device 220 activates the light zone 202 by means of the anode 226, via the electronic track 232, the second light zone 202 emits a white light with a yellow tint. Note that as in the previous embodiments, the cathode is formed by the substrate 210 common to all the light areas. This cathode is connected via an electronic track 234 to the control device 200. The thickness 242 of the phosphor above the rods 212 of the second light zone 202 is greater than that 241 above the rods 211 of the first light zone 201 This difference in thickness d is such that the phosphor above the rods will emit rays of light of white color with a yellow hue.
    A third light zone, not shown, comprises a phosphor thickness lower than that above the first light zone, so that it will emit a white color with a blue hue.
    These light areas 201, 202 can be arranged and controlled by the control device 220 in the same way that the light areas 1 to 3 are controlled by the control device 20 in the previous embodiments, in order to confer on the light beam Fl , F2, F3, and to its different parts the desired colors or required.
    权利要求:
    Claims (17)
    [1" id="c-fr-0001]
    A vehicle luminous device (D) capable of emitting a white light beam (F1, F2, F3), said luminous device comprising: - transmission means (1 to 3; 201, 202) of the light beam of white color, - at least one connection means (C) connected to these transmission means and intended to be connected to a power supply (A) for electrically powering said transmitting means, said transmitting means and said at least one connection means being arranged to be able to give the light beam different white colors according to the power supply received by the connecting means.
    [2" id="c-fr-0002]
    2. Light device according to claim 1, comprising a shaping optics (O) arranged to project the image of the transmitting means (1 to 3; 201, 202) so as to form said beam. light (Fl, F2, F3), said light beam being a light beam of the road.
    [3" id="c-fr-0003]
    3. Lighting device according to claim 2, wherein said transmitting means (1 to 3; 201, 202) and said connecting means are arranged so as to be able to confer on the light beam (F1, F2, F3) distinct parts. each having a different white color.
    [4" id="c-fr-0004]
    4. Lighting device according to claim 3, wherein the separate parts correspond to side portions (61, 61 ', 61' ') of the illumination beam (F1, F2), at least one lower part (63) intended to illuminate below the cutoff height (h) and, optionally, at least one upper portion (62) for illuminating above the cutoff height.
    [5" id="c-fr-0005]
    Light device according to claim 4, in which: the lateral parts (61, 61 ', 61' ') have a white color with a shade of green, the at least one lower part (63) has at least one part of a neutral white color or with a shade of blue, the at least one upper part (62) has at least part of a white color with a shade of yellow.
    [6" id="c-fr-0006]
    6. Light device according to one of the preceding claims, wherein said transmitting means comprise: - several distinct light areas (1 to 3), at least one light zone being arranged to emit light rays of a color different from that of the light rays emitted by at least one other light zone, - a shaping optics (O), able to receive the light rays emitted by the light zones and to deflect them out of the luminous device so as to form said light beam.
    [7" id="c-fr-0007]
    Light device according to claim 6, in which the light zones (1 to 3) are distributed in a light group (G11, G12, G21, G23), each of these groups comprising at least two light zones, and each light zone of each of the light groups being able to emit a different color from the one that the other light zones of the same light group are able to emit.
    [8" id="c-fr-0008]
    8. Light device according to claim 7, wherein the arrangement of the light areas is identical in each of the light groups.
    [9" id="c-fr-0009]
    The light device according to claim 8, wherein the light groups are arranged in rows and columns, the rows and the columns comprising a number of light groups sufficient for at least one reason for a part or the entirety. a lighting beam (F3) of the road can be achieved by the plurality of light areas.
    [10" id="c-fr-0010]
    10. Light device according to one of claims 6 to 9, comprising a light source (S) comprising a substrate (10; 210) from which extend several rods of light emitting semiconductor material, all of these rods being distributed in zones forming said light zones.
    [11" id="c-fr-0011]
    11. Light device according to claim 10, wherein each light zone comprises a layer of a phosphor arranged above the rods so that the phosphor receives the rays emitted by the rods and in turn emits light rays, corresponding to the light rays emitted by the corresponding light zone, in which the phosphor layer on the rods of each light zone of the same light group, or even of the entire light source, forms a single phosphor layer, and in which the rods of the different light zones have chemical compositions different from each other, so that each light group comprises: a first light zone whose rods have a chemical composition enabling them to emit violet light rays, so that this phosphor emits light rays of a white color with a shade of green, - a second luminous zone whose rods have a chemical composition enabling them to emit light rays of blue-green color, so that this luminophore emits light rays of a white color with a shade of yellow, - A third light zone whose rods have a chemical composition allowing them to emit light rays of blue color, so that the phosphor emits light rays of a white color with a shade of blue.
    [12" id="c-fr-0012]
    The light device according to claim 10, wherein each light region (201, 202) comprises a layer of a phosphor arranged above the rods so that the phosphor receives the rays emitted by the rods and emits to its turn of the light rays, corresponding to the light rays emitted by the corresponding light zone, in which the phosphor layer on the rods of each light zone of the same luminous group, or even of the entire light source, forms a single layer of phosphor, each luminous group comprising: a first luminous zone whose phosphor layer has a first thickness (241) such that this phosphor emits light rays of a white color with a shade of green, a second luminous zone whose phosphor layer has a second thickness (242) such that this phosphor emits light rays of a white color with a shade of yellow, - a t third light zone whose phosphor layer has a third thickness such that this phosphor emits light rays of a white color with a shade of blue, said second phosphor thickness having a value greater than the value of said third phosphor thickness, said first phosphor thickness having a value between that of the third thickness and that of the second thickness.
    [13" id="c-fr-0013]
    13. A road lighting system comprising: - a light device (D) according to one of the preceding claims, said transmitting means comprising: - several distinct light zones (1 to 3) distributed in a light group, each of these groups comprising at least three light zones, for each of the light groups, each light zone being able to emit a color different from that which the other light zones of this light group are able to emit, and - a shaping optics ( O), able to receive the light rays (r1, r2) emitted by said light areas and to deflect them out of the luminous device so as to form said light beam, - a control means (20) for said light zones, - a sensor image of the road in front of the vehicle, - a calculator able to identify inside this image (R) several portions corresponding to categories of sectors of the road and its environment, and to send a signal corresponding to said control means so that said light areas are fed in a different way according to different light groups, so that several sectors of the road and its environment relevant to a different category are illuminated, at least several of said illuminated areas (161, 162, 163) being illuminated with a different color.
    [14" id="c-fr-0014]
    14. Lighting system of the road comprising: - a light device according to one of claims 1 to 12, - a control means (20) of the light source, - activation means adapted to transmit by means of driving different signals corresponding to different lighting modes, the control means being able to feed different light areas according to the received signal, so that the light beam can take different configurations (Fl, F2) of different white colors according to the received signal.
    [15" id="c-fr-0015]
    15. A method of controlling a light device, said light device being able to confer on the light beam (F1, F2, F3) that it emits different white colors, this method comprising: a step of sending a light control signal according to a given road configuration, - a step of determining the white color (s) to be conferred on the light beam according to this given road configuration, - a control step of the device for that it emits the light beam with the selected white color (s).
    [16" id="c-fr-0016]
    16. Control method according to claim 15, comprising the following steps: - capture an image (R) of the road in front of the vehicle, - identify inside this image several portions corresponding to categories of sectors of the road and from its environment, - select the light areas (1 to 3) to be powered electrically so that the light areas are fed in a different way, so that several areas of the road and its a different category of sectors are illuminated, at least several of said illuminated sectors being illuminated with a different color.
    [17" id="c-fr-0017]
    17. Control method according to claim 16, wherein the light areas are fed so that the lighting beam: has at least a portion (161, 161 ') of a white color with a shade of green illuminating the side of the road, - has at least part (163) of a neutral white color or with a shade of blue illuminating the road surface, - has at least a portion (162) of a color white with a hint of yellow above the road and / or aisles.
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    同族专利:
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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 |
    2019-09-30| PLFP| Fee payment|Year of fee payment: 5 |
    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
    FR1559083A|FR3041576B1|2015-09-25|2015-09-25|DEVICE AND METHOD FOR CONFERING DIFFERENT WHITE COLORS TO A BRIGHT BEAM|
    FR1559083|2015-09-25|FR1559083A| FR3041576B1|2015-09-25|2015-09-25|DEVICE AND METHOD FOR CONFERING DIFFERENT WHITE COLORS TO A BRIGHT BEAM|
    PCT/EP2016/072234| WO2017050727A1|2015-09-25|2016-09-20|Device and method for imparting different white colours to a light beam|
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