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    • 专利摘要:
    The present invention relates to a vehicle light device (1) comprising: - an optical element (10) having a generating surface (12) caustic controlled so as to propagate a pattern on a useful interval, - a mounting part ( 2) on which is mounted a beam generator (3) of rays incident on said generating surface, the optical element being arranged so that the propagated pattern is projected on a target surface, visible from the outside the light device and located in the useful range.
    公开号:FR3077363A1
    申请号:FR1850758
    申请日:2018-01-30
    公开日:2019-08-02
    发明作者:Jerome LE CORRE
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    LIGHT DEVICE WITH CONTROLLED CAUSTIC-GENERATING SURFACE FORMING A PATTERN ON A TARGET SURFACE
    The present invention relates to the field of light devices emitting patterns on a given surface, in particular on the road.
    Document WO2016184721A1 discloses vehicle light devices comprising two plates of transparent material, the front and rear dioptres each of which have a surface forming an array of optical lenses. Between the two plates, a cover is arranged. The cover and the optical lenses of each matrix are pressed together and arranged so as to form together a given light pattern.
    However, such a conception is complex.
    The technical problem which the invention aims to solve is therefore to simplify a vehicle light device making it possible to produce light patterns, in particular for projecting them onto a surface.
    To resolve this problem, the Applicant had the idea of using caustics.
    Caustics are a long-known optical phenomenon. They can be seen, for example, at the bottom of a swimming pool lit by the sun. They form fluctuating patterns there overall forming a mesh of more concentrated and therefore brighter lines of light, with darker areas between the meshes. These dark lines and areas are due to the different fluctuations of the water surface. These fluctuations locally form variations in orientation around the generally planar shape of the water surface. Thus, depending on the local variations encountered, the rays will be deflected differently, some approaching and forming the more concentrated and therefore brighter lines, and others moving away and forming the dark areas. The mesh varies according to the agitation of the surface.
    In recent years, researchers have been interested in methods for using this phenomenon on fixed surfaces with local variations, so as to generate complex caustics of controlled form. In particular, they have developed different methods for calculating refractory surfaces formed of a transparent material with a distribution and an arrangement of local variations, so that, when these refractory surfaces are illuminated, these allow, from a given light source, to form a pattern on a screen.
    In some works, this motif, called the target motif, physically corresponds to a distorted image of the motif formed in relief by local variations, known as the object motif.
    The Applicant has noticed that such surfaces could be used in vehicle lighting devices.
    Thus, the invention relates to light devices, in which a controlled caustic generating surface deflects the light rays from a light source, this generating surface having local variations arranged so as to form a determined pattern on a given surface. .
    To this end, a first object of the invention is a vehicle light device comprising:
    an optical element having a controlled caustic generating surface, this generating surface being a reflecting or refractive surface, extending according to a given global shape and having local variations in shape around this given global shape, these local variations being distributed over the whole of said generating surface so that they give the whole of the generating surface a relief forming an object pattern, these different local variations being arranged so that the majority of said generating surface is smooth and so so that for a beam of rays incident on the whole of this said generating surface, these rays having a given distribution, said generating surface deflects the rays according to different orientations according to the local variations which they meet, thus forming a beam deviated propagating an identifiable propagated pattern able over a useful interval extending upstream of and at least up to an optimal distance of given finite propagation, this propagated pattern corresponding to a distorted projection of the object pattern,
    - a mounting part on which is intended to be mounted a ray beam generator according to the given distribution, so that the rays are incident on said generating surface, the optical element being arranged so that the pattern propagated can be projected onto a target surface, which is visible from outside the light device and which is located within the useful interval and / or at a distance substantially equal to this said optimal distance.
    By "identifiable", we mean that we recognize the pattern as that which would be observed at the optimal distance.
    The best result is observed when the target surface is located at a distance substantially equal to this so-called optimal distance.
    In the application, "smooth" means a zone which can be diverted at any point, in other words an area devoid of a projecting or re-entering edge. A portion is smooth when all the points forming it obeys this definition.
    Thus, it is possible to mount a light beam generator, such as a light source or a light source and a set of one or more optical elements, making it possible to generate rays according to a given distribution, this mounting being done so that these rays are incident on the optical element. Therefore, the ignition of the beam generator will allow the generation of the propagated pattern, which will propagate until it meets a surface, in particular the target surface.
    Projecting the propagated pattern onto the target surface forms the target pattern.
    These beam generators can be simple. The optical element in itself is enough to modify the beam to make it a pattern.
    Furthermore, this pattern is propagated over a given finite distance, namely over the useful interval including the distance where the sharpness is optimal, namely the optimal distance of propagation, which allows a certain freedom over the distance between the element. optic and target surface. The light device is easier to assemble. This optimum propagation distance, hereinafter called the optimum distance, is the distance at which the majority of the rays deflected and forming the target pattern cross and therefore at which this pattern has the best sharpness. The generating surface can thus be easily designed in relation to this definition.
    In addition, unlike solutions with covers, in the light device according to this first object, most, if not all, of the light rays meeting the generating surface are deflected and form the target pattern. The brightness of the target pattern is therefore greater with the light device according to this first object.
    The light device according to the invention can optionally include one or more of the following characteristics:
    the given distribution is substantially such that for any transverse plane, in particular perpendicular, to the direction of propagation, at a given point of this plane, the incident ray (ies) at this point comes from a single direction;
    according to the given distribution, the rays are substantially parallel or substantially distributed in a transmission cone;
    the distribution given corresponds to that of a light-emitting diode;
    the light device comprises the ray beam generator according to the given distribution; the light device is thus ready to emit;
    the generating surface comprises at least one smooth portion, the surface of which represents the majority of the generating surface, the passage from one local variation to the other being smooth inside this smooth portion;
    the majority of the generating surface is arranged so that each local variation deflects the rays so as to form one and only one portion of the target pattern which is distinct from the portions of the target pattern formed by the other local variations, and for the majority of the target motif, each potion of the target motif receives the light rays of one and only one local variation; there is thus, for this majority of the generating surface and this majority of the target pattern, a bijective relationship between each smooth portion of the object pattern and each portion of the target pattern without discontinuity marked with luminosity; this simplifies the calculation and therefore the production of the generating surface;
    the entire generating surface is smooth, the transition from one local variation to another being smooth; this also makes it possible to distort the image of the parts upstream of the optical element; it is thus possible either to distinguish these parts through the optical element, when the optical element is a transparent element refracting the rays emitted by said beam generator, or by observing the image of these parts on the optical element , when the latter is a reflector reflecting the rays emitted by said beam generator; this allows you to work on the style of the beam generator;
    the entire generating surface is arranged so that each local variation deflects the rays so as to form one and only one portion of the target pattern which is distinct from the portions of the target pattern formed by the other local variations, and for all target motif, each potion of the target motif receives the light rays of one and only one local variation; there is thus a bijective relationship between the whole of the object motif and each potion of the target motif without discontinuity marked with luminosity; this simplifies the calculation and therefore the production of the generating surface;
    the passage between certain local variations is delimited by an edge; such a passage creates a discontinuity in the variations in slope on the generating surface; this creates very dark or even black areas and very bright and narrow areas, such as sharp writing;
    the local variations are arranged so that the rays of the deflected beam do not cross until said optimum distance; thus the target pattern remains sharp on a target surface positioned upstream from or at the optimal distance;
    according to the preceding paragraph, there may also be a minimum distance below which the pattern is not formed; in this case, the pattern is clear in an interval, corresponding to the useful interval ranging from this minimum distance to at least up to the optimal distance; for example, this interval represents more than half of the optimal distance;
    the local variations have a tangent to the given overall shape forming an angle between -60 and 60 degrees, in particular between -30 and 30 degrees; this allows good transmission of light rays;
    each local variation has, at each of its points, an amplitude defined as the distance between the local variation and said global form according to the normal at a given point of the global form;
    the maximum amplitude of each local variation is in the range between 0.001 millimeter and 1 millimeter; this gives a smoother appearance to the generating surface;
    in an overall direction of propagation of the beam, the optical element is circumscribed in a rectangle, one side of which extending in a direction parallel to this direction of propagation is at least four times greater, in particular six times greater than that of the amplitude of each local variation with respect to the global form given at the level of this local variation;
    in a global direction of propagation of the beam, the generating surface is circumscribed in a rectangle, one side of which extending in a direction parallel to this direction of propagation is at least ten times greater, in particular thirty times, than that of one of the sides of a beam generator light source;
    the beam generator comprises a light source, in particular a light-emitting diode; the light emitting diodes are particularly suitable for being coupled to a controlled generator surface;
    the beam generator comprises a light emitting diode emitting its rays generally in a cone; for example, the generator can be formed only from one or more light-emitting diodes the beam generator comprises a light source, in particular a light-emitting diode, and an optic arranged with the light source so as to generate a beam of substantially parallel rays ;
    the light device comprises a screen comprising a surface forming the target surface; thus the target pattern is visible on or inside the light device;
    the screen is formed by a grainy translucent plate, in particular arranged in front of the beam generator; this makes it possible to form a simple screen; moreover, this screen placed in front of the beam generator makes it possible to hide the latter;
    the light device comprises a housing and a closing glass of the housing through which the rays emitted by the light device emerge, the closing glass forming the screen, the target surface forming part or all of the portion of the closing glass through which these spokes exit; this displays a pattern, such as a logo or information on the light device; in particular, the target surface is diffusing, for example it can be grained, or else be coated with a diffusing film;
    the light device is a signaling light, the generating surface and the target surface being arranged so that the target pattern forms the illuminating surface of the signaling function; one can thus realize with few parts a signaling light;
    the light device is intended to be mounted inside the passenger compartment of a vehicle, said light device being arranged so that once mounted in the vehicle, it can project the target pattern on the one hand to the exterior of said light device and on the other hand, on a surface of the passenger compartment arranged at a distance from the optical element within the useful interval or substantially equal to the optimal distance; this allows in particular to create a mood pattern, to display a logo; this light device can be specially dedicated for this purpose or be a wall or ceiling lamp;
    the surface of the passenger compartment is an armchair, a dashboard, a portion of the windshield or of a window, or a screen projecting from the dashboard, or an upright carrying a glazing, the ceiling of the passenger compartment ; in particular, the surface of the passenger compartment may be a diffusing portion of the windshield or of a window, for example a grained portion, or else coated with a diffusing film;
    the optical element comprises a reflecting surface at least a portion of which is formed by the generating surface; in other words the generating surface is reflective; in particular, the optical element can be a mask, in particular metallized; in this case the generating surface can form a portion of the surface of this mask; it is thus possible to confer another function on the mask, than that of masking certain parts of the light device;
    the optical element is made of a transparent material and is arranged with the beam generator so as to form the deflected beam by refraction of the rays emitted by the beam generator; this allows a simple arrangement;
    according to the preceding paragraph, the optical element comprises an entry face of said rays arranged opposite the beam generator and an exit face of these rays arranged opposite said entry face, the generating surface being formed on the inlet face or on the outlet face;
    according to the preceding paragraph, the optical element comprises two generating surfaces, a first generating surface being formed on the inlet face and a second generating surface being formed on the outlet face, these two generating surfaces being arranged together so as to form the target pattern and ensure its propagation over the optimal distance; this allows more freedom in the slopes to be given to local variations; moreover, it can also make it possible to obtain a better contrast, or even to increase the depth of field, or even to tend towards an infinite depth of field;
    the light device comprises a housing and a lens for closing the housing through which the rays emitted by the light device exit, the closing glass forming the optical element, the generating surface being formed on the surface of a portion of the glass closing, the deflected beam being formed by refraction of the rays emitted by the beam generator; this allows the target pattern to be propagated outside the vehicle and without the addition of a new part; for example, the light device can be arranged so that once mounted on the vehicle, the distance between the generating surface and the road in the direction of propagation of the target pattern, corresponds to the useful interval or is close to the optimal distance, according to a given orientation of the vehicle; this allows the light pattern to be projected onto the road; this distance between the closing glass and / or the generating surface can be equal to half the optimal distance, when the road is horizontal; in the latter case, this makes it possible to have a clearly visible pattern, whatever the orientation of the vehicle, uphill, downhill, when braking or when accelerating;
    the optical element comprises a reservoir comprising a liquid and air forming between them a moving diopter, the reservoir comprising a transparent inlet wall and a transparent outlet wall opposite the transparent inlet wall , one of these walls comprising said generating surface, the light generator being arranged so as to emit a light beam towards the transparent entry wall so that the rays pass successively through the transparent entry wall, the diopter , and the transparent outlet wall, passing through said generating surface; this allows in particular to display a fixed pattern when the car is stopped or at constant speed, and to make it disappear when the car starts, brakes or accelerates.
    The vehicle light device according to the invention can for example be:
    - a road lighting device, in particular a front headlamp, in particular emitting a dipped beam and / or a long-range light, or even a fog light;
    - a signaling device, in particular a rear position light, a daytime position light (or DRL, for “Day Running Light”) a direction indicator, a stop light, a raised stop light, a rear fog light, a light hindsight;
    - a lighting device for the interior of the vehicle, in particular a ceiling lamp or a side wall lamp.
    The invention also relates to a vehicle comprising a light device according to the invention, in particular connected to the electrical supply of the vehicle.
    The terms "upstream" and "downstream" refer to the direction of propagation of the light rays in the light device and outside it.
    Unless otherwise indicated, the terms "front", "rear", "lower", "upper", "side", "transverse" refer to the direction of light emission from the corresponding light device.
    Other characteristics 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, among which:
    Figure 1 is a schematic view of a beam generator and an optical element of a light device according to a first embodiment of the invention;
    Figure 2 is an enlarged view of a portion of Figure 1;
    Figure 3 is a schematic view of a beam generator and an optical element of a light device according to a second embodiment of the invention;
    FIG. 4 schematically represents the propagation of a target pattern by a beam generator and an optical element of a light device according to the invention;
    FIG. 5 schematically represents a target pattern formed by a beam generator and an optical element of a light device according to the invention;
    FIG. 6 schematically represents the object pattern of the generating surface making it possible to generate the target pattern of FIG. 5;
    FIG. 7 represents a first example of a light device according to the invention;
    FIG. 8 represents a second example of a light device according to the invention;
    FIG. 9 represents a third example of a light device according to the invention;
    FIG. 10 represents a fourth example of a light device according to the invention;
    FIG. 11 shows a fifth example of a light device according to the invention, installed in a stationary or constant speed vehicle;
    Figure 12 corresponds to Figure 11 when the vehicle starts, accelerates or brakes;
    Figure 13 shows the target pattern generated in the case illustrated in Figure 12;
    Figure 14 shows schematically a third embodiment according to the invention;
    Figures 15a to 15f show schematically the different stages of calculation of the generating surface.
    Figures 1 and 2 illustrate an example of a vehicle light device 1 according to the invention. These figures also make it possible to illustrate the general principle of the invention.
    According to the invention, the light device 1 comprises an optical element 10 having a generating surface 12 of controlled caustic. This generating surface 12 can be a reflecting surface or a refracting surface, as illustrated in FIGS. 1 and 2. This optical element is hereinafter called a caustic generator 10.
    The generating surface 12 extends according to a given overall shape 13, represented by the vertical line in dotted lines in FIGS. 1 and 2.
    More particularly, in the embodiment of Figure 1, the caustic generator 10 is a transparent plate having an inlet face 11 and an outlet face. The input face 11 is arranged opposite a beam generator 3 of light rays so as to receive the rays n, r 2 , r 3 emitted by the beam generator 3. The output face is arranged to receive the rays η, r 2 , r 3 refracted by the input face 11.
    As in the example illustrated, the outlet face may be formed, in particular entirely, by the generating surface 12.
    In general, the generating surface 12 has local variations in shape around the given overall shape 13. These local variations are distributed over the whole of the generating surface 12, so that they give the assembly of the generating surface 12 a relief forming an object pattern.
    For example, as illustrated in FIGS. 1 and 2, these local variations form hollows and bumps on the outlet face of said caustic generator 10.
    Generally, these different local variations are arranged so that the majority of said generating surface 12 is smooth. Thus for the majority of the generating surface 12, this surface is differentiable at all points. In other words, on smooth areas, it has no protruding or inward edges.
    In general, these different local variations are arranged in such a way that for the beam of rays η, r 2 , r 3 incident on the whole of this said generating surface 12, these rays η, r 2 , r 3 having a given known distribution, the generating surface 12 deflects the rays η, r 2 , r 3 according to different orientations as a function of the local variations which they meet, thus forming a deflected beam propagating a light pattern over a useful interval extending upstream of and at least up to an optimal distance of given finite propagation, called optimal distance, this propagated pattern corresponding to a distorted projection of the object pattern.
    This generating surface 12, with its local variations, corresponds to a generating surface of controlled caustic.
    Indeed, these local variations create local convergences and divergences of the rays. As these variations are local, a majority of rays depart or approach without crossing before a certain distance. Thus, in the same way as the surface of a swimming pool traversed by the rays of the sun creates a luminous pattern propagating and projecting on the bottom of a swimming pool, the generating surface 12 creates a luminous motif which propagates, the motif spread.
    In the case of a swimming pool, this pattern generally spreads over a distance of 3 meters. The propagated pattern can therefore be observed by projecting onto the bottom of the pool, whether the bottom is 1.5 m or 2 m away. This background therefore forms the screen on which the caustic forming the propagated pattern can be observed.
    In the case of a controlled caustic-generating surface, as according to the invention, as a function of local variations the light pattern propagates at least over a given optimal distance. Beyond this optimal distance D p , the rays of the deflected beam cross.
    In the context of the invention, and as can be seen in the block diagram in Figure 4, the optimal distance D p is finite. If a screen is interposed at an intermediate distance Di or at another intermediate distance D 2 , which are less than the optimal distance D p , the same more or less distorted pattern will be observed.
    Note that this optimal distance D p is that at which the pattern will have the best sharpness. The generating surface can thus be designed in relation to this definition.
    There can also be a minimum distance D o below which the pattern is not formed. This minimum distance D o is generally quite small. This minimum distance D o can be a few centimeters, or even a few millimeters depending on the application, such as an application to an automobile lighting device. In the latter case it may be less than 1 centimeter (cm).
    Also, the pattern is not lost as soon as the rays cross but after, at a maximum distance (not shown) greater. It is however easier to design the generating surface in relation to the distance of crossing of the rays, which is defined more precisely than the distance at which it is considered that the pattern is lost. In the present application, this ray crossing distance is therefore called the optimal propagation distance or optimal distance.
    In other words, the useful interval includes a downstream portion, going from the optimal distance D p to this maximum distance, and an upstream portion, going from the minimum distance D o to the optimal distance D p . The pattern observable at the optimum distance D p , if a screen is placed there, remains identifiable within these upstream and downstream portions.
    In general, in the invention, this downstream portion can be of a different value from that of the upstream portion. In particular, it can be more than half of it lower.
    For example, in a spotlight with a diffusing portion of closing ice, with an optimal distance D p of 20 cm, a minimum distance D o of 1 cm, the value of the upstream portion would be 19 cm, and the downstream portion could be less than 9.5 cm.
    In particular, said caustic generator 10 and its local variations are arranged in such a way that the propagated pattern is projected onto a target surface, which forms the screen, to form therein a luminous pattern, called the target pattern. This target surface is visible from outside the light device 1 and is located at a distance within the useful interval. The target surface can be at about or at the optimum distance D p , which improves the sharpness.
    In general, to manufacture the generating surface 12, this is in particular calculated by taking into account the target pattern that one wishes to display, the shape of the target surface and its arrangement with respect to the light rays forming the target pattern, as well as the given distribution of the rays n, r 2 , r 3 on emission by the beam generator 3, in particular their incidence on said caustic generator 10.
    According to the invention, the given distribution may correspond to radii n, r 2 , r 3 which are substantially parallel, as illustrated in FIG. 3, or, in particular, as illustrated in FIGS. 1 and 2, substantially distributed overall according to an emission cone 14, in particular as with a divergent light source, such as an LED. This makes it possible to more simply establish the angle of incidence of the rays on said caustic generator 10, thus simplifying the calculation of the generating surface 12.
    For this, it is possible to consider that the given distribution is such that for any plane perpendicular to the direction of propagation, at a given point of this plane, the incident ray (s) at this point comes (nen ) t from a single direction. Indeed, the distribution of the rays emitted by an LED corresponds substantially to such a given distribution.
    To simplify the calculation, it is possible to discretize the surface into numerous elementary surfaces and to assimilate these to the points mentioned in the previous paragraph.
    The light device 1 can be delivered without the beam generator 3, but has a mounting part 2 on which it is intended to be mounted, so that the rays n, r 2 , r 3 are incident on said generating surface 12.
    In particular, this mounting part 2 and the beam generator 3 can be arranged so that during mounting, the beam emitted by the beam generator 3 has a given overall direction with respect to said caustic generator 10. Thus, there is no There is no need for the assembly to adjust this orientation so that it matches the arrangement for generating the target pattern.
    It should be noted that these caustic generating surfaces do not require great precision as to the positioning of the beam generator 3. The assembly is therefore simplified.
    In the example illustrated in FIG. 1, the beam generator 3 is mounted on the mounting part 2.
    The beam generator 3 can, as here, be formed by a light-emitting diode or LED. In FIG. 1, a light emitting element 4 of the LED is shown diagrammatically, with a transparent protective dome 5 attached to it.
    The target surface can be a screen of the light device, a surface of the vehicle interior or a surface external to the vehicle, such as the road.
    The methods for calculating this generating surface 12 can follow the following process, an example of which is illustrated in FIGS. 15a to 15f:
    - in a step, called the upstream step E1, illustrated in FIG. 15a, establish the relationship defining the angle of incidence of the rays n, r 2 , r 3 , r 4 , r 5 and their distribution at each point of the overall shape 13 given, taking into account the given distribution of the radii n, r 2 , r 3 , in other words making it possible to also define the luminosity of each point at the level of the given global shape 13 on said caustic generator 10, called object point pi , p 2 , p 3 , p 4 , p 5 ,
    - In a step, called downstream step E2, which can be carried out before, after or at the same time as said upstream step E1, define the light distribution on the target surface making it possible to obtain the target pattern, and therefore define the brightness of each point of the target surface 19, said target point p'-i, p ' 2 , p' 3 , p ' 4 ,
    - then, in a correlation step E3, illustrated in FIG. 15b, establishing a relationship between each object point pi, p 2 , p 3 , P4, Ps and each target point p'i, p ' 2 , p' 3 , p ' 4 , in particular so that each target point p'i, p' 2 , p ' 3 , p' 4 receiving light is associated with a single or with a set of object points pi, p 2 , p 3 , p 4 , p 5 making it possible to obtain the luminosity required at these points for the formation of the pattern,
    - then, in an orientation step E4 / E5 of local variations, illustrated in FIGS. 15c to 15f, as a function of the target points and object points associated by the relationship established in the correlation step E3, determine the orientation of the local variations to be applied to the global shape so that the radii η, r 2 , r 3 , r 4 , r 5 incident on the object points pi, p 2 , p 3 , p 4 , p 5 are deviated so to have the orientation allowing them to reach the target points p'i, p ' 2 , p' 3 , p ' 4 associated by this relation.
    The upstream step E1 takes account of the distribution of the rays upon their arrival at the level of the given overall shape 13. The simplest case, not shown, is that of an optical element 10, such as that illustrated in FIGS. 1 and 15a, formed of a transparent plate whose entry face 11 and the given overall shape 13 of the generating surface 12 are planar, and with a beam generator 3, such as that of FIG. 3, emitting parallel rays.
    In this simple case, the beam generator 3 and said caustic generator 10 are arranged so that the rays are perpendicular to the entry face 11. These rays are therefore not deflected before meeting the exit surface on which is formed the generating surface.
    The embodiment of Figures 1 and 2 and Figures 15a to 15f is an intermediate case where the rays are distributed in an initial cone 14 at the exit of the beam generator 3, then refracted by the plane entry face, thus remaining inscribed in a cone, allowing an easy determination of the angle of incidence of the rays η, r 2 , r 3 , r 4 , r 5 with the overall shape 13, and therefore an easy determination of the angle of incidence of the radii η, r 2 , r 3 , r 4 , r 5 with the generating surface 12.
    The embodiment of FIG. 3 is another intermediate case where the distribution of the rays η, r 2 , r 3 is initially simpler, since they are parallel at the output of the beam generator 3. On the other hand, they are then refracted differently by the input face 11 because it is curved, for example cylindrical with a circular or elliptical section. However, this curvature being defined, it makes it possible to determine the orientation of the radii η, r 2 , r 3 on their arrival at the level of the given overall shape 13 of the generating surface 12, which too is curved.
    In the example illustrated in FIG. 3, the optical element is a curved transparent plate, the inlet face 11 and the overall shape 13 of the generating surface 12 of which are cylindrical.
    In order to have parallel rays, the beam generator 3 can comprise a light source 6, such as a light-emitting diode, and a collimating lens 7 whose diopters make it possible to orient the rays in parallel.
    More complicated cases can however be considered, with:
    - rays distributed in a cone of emission,
    - a curved entry surface, in particular cylindrical, and
    - a generating surface of given overall shape curved.
    It is also possible to envisage other given distributions of the departments.
    Regarding the downstream step E2, the simplest case is when the target surface 19 is plane and perpendicular to the overall direction of emission of the rays on arrival at the level of the overall shape 13 of the generating surface 12 to be calculated. The target pattern then corresponds to the propagated pattern.
    In more complex cases, the orientation of the planar target surface must be taken into account, at an angle to the overall direction of emission of the rays on arrival at the generating surface. However, such a determination remains simple. It is more complicated, but achievable, when the target surface is not flat. Its shape must therefore be taken into account, in particular defining it by an equation to determine the light distribution, in order to be able to observe the target pattern in projection. In all these more complex cases, the propagated pattern, if it is defined according to a plane perpendicular to the direction of propagation thereof, differs from the target pattern.
    Then, different methods can be used to perform the correlation step E3 between the rays incident on the overall shape 13 of the generating surface 12 and the light distribution on the target surface 19.
    As explained above, this correlation step makes it possible to determine which object points ρ Ί , p 2 , p 3 , p 4 , Ps of the given global form 13 are associated with which target points p'-i, p ' 2 , p' 3 , p ' 4 of the target surface 19.
    Thanks to the upstream step E1, the orientation of the radii η, r 2 , r 3 , r 4 , r 5 is known on arrival at the given global shape 13 of the generating surface 12. Furthermore, thanks to the correlation between target points p'i, p ' 2 , p' 3 , p ' 4 and object points ρ Ί , p 2 , p 3 , p 4 , p 5 , we determine the orientation of the rays η, r 2 , r 3 , r 4 , r 5 at the start of this given global form 13 to join the object points ρ Ί , p 2 , p 3 , p 4 , p 5 to the target points p'i, p ' 2 , p' 3 , p ' 4 with which they are correlated.
    This therefore makes it possible to carry out the orientation step E4 / E5, by calculating the variation to be attributed to the outlet surface with respect to this given global shape 13 at any point thereof, which makes it possible to define the generating surface 12.
    Once this calculation has been made, we therefore observe, as a function of the amplitudes of the local variations, that the generating surface 12 is at a greater or less distance from the given global shape 13. To refine the calculation of the generating surface 12, we can therefore reiterate the upstream and downstream steps as well as the definition step, considering the arrival of the rays and their departure with respect to the shape of the generating surface obtained previously and no longer with respect to the given overall shape. The precision of this surface and therefore the sharpness of the image will be improved with the number of iterations. Furthermore, this also makes it possible to smooth the generating surface.
    To perform the orientation step, it is possible to use the laws of Descartes, also known as Snell's laws in some English-speaking countries, or even as Snell-Descartes' laws.
    Thus, in a sub-step E4, illustrated in FIGS. 15c and 15e, for an object point pi, p 2 , p 3 , p 4 , p 5 of the given global shape 13 or of the generative surface calculated previously, with the direction of arrival and departure direction of the rays η, r 2 , r 3 , r 4 , r 5 , we can determine the tangent F and the normal n of the exit surface at this point so that it deflects each ray η, r 2 , r 3 , r 4 , r 5 incident on arrival in the corresponding direction of refraction.
    By determining, the set of normals n, also called fields of normals, in a sub-step E5, illustrated in FIGS. 15d and 15f, the generating surface 12 having these normals is determined.
    Figures 15c and 15d illustrate the realization of these two sub-steps in an enlargement at the object points ρ Ί , p 2 , p 3 , not referenced in Figures 15c and 15d for clarity.
    Figures 15e and 15f illustrate the realization of these two sub-steps in an enlargement at the object points p 4 , p 5 not referenced in Figures 15e and 15f for clarity.
    In FIG. 2, one can observe the local variations of the generating surface 12 with respect to the given global shape 13, plane in this example. These local variations correspond to changes in slope, defined by the normal n and / or the tangent t to the generating surface 12 at the level of these local variations. As a result, this generating surface 12 includes deviations from the overall shape 13 and forms hollows and bumps.
    For clarity, the normals n and tangents t have only been represented here for three points of the generating surface 12, the normal and / or the tangent are however calculated for all the points.
    The amplitude of a local variation can in this request be defined as the distance between the local variation and said global form 13 according to the normal at a given point of the global form 13.
    If the overall shape is planar, as in FIGS. 1 and 2, any point of the given overall shape can be defined by a dimension in a single direction z perpendicular to this overall shape 13.
    In FIG. 2, a minimum amplitude a-ι is observed, by negative convention since it is located upstream of the generating surface 12, and a maximum amplitude a 2 downstream of the generating surface 12, by positive convention.
    Note that in the illustrated process, it is possible to discretize the surface into numerous elementary surfaces and to assimilate these to the points mentioned ρ Ί , p 2 , p 3 , p 4 , p 5 , p'i, p ' 2, p's, pV
    FIG. 5 illustrates the propagated pattern 16, as it will be seen on a flat screen, perpendicular to the direction of propagation and at a distance equal to or close to the propagation distance. If the target surface is also flat and oriented in this way, then this propagated pattern 16 will also be the target pattern 16 ’observed in FIG. 5. Otherwise, it will be deformed.
    The generating surface 12 which made it possible to produce this propagated pattern 16 is illustrated in FIG. 6. Due to the reliefs formed on this surface 12, one can observe the object pattern 15 formed by this relief and therefore the local variations. This object motif 15, symbolized in FIG. 6, corresponds to a distorted shape of the propagated motif 16.
    In a case where it would also be desirable for the pattern in FIG. 5 to be the target pattern 16 ′ observed by a driver observing the roadway, the target pattern being formed by grazing rays with respect to the roadway since, for example, coming from a taillight, the propagated pattern should then be distorted from the target pattern, to observe the star on the road as shown in Figure 5.
    According to the invention, as in FIGS. 1 and 2, the generating surface 12 can be arranged, and therefore calculated, so that, for the majority of the generating surface 12, namely on smooth portions representing the majority of this surface, the transition from one local variation to another is smooth. This is particularly the case of the portion illustrated in Figure 2. In a case where for the calculation, the local variations are not considered as points but as a small area of the generating surface, in particular an infinitesimal area, the generating surface 12 can be further arranged so that, for these smooth portions, the local variations are smooth.
    In particular, one of the smooth portions may have a surface representing the majority of the generating surface.
    A first example of a calculation method can be used to calculate this generating surface 12. This is the method disclosed in the document Yue et al. [1]. This document indicates in particular the different stages for constructing the generating surface 12 from a given example, in particular for establishing the relationship between the points of the generating surface 12 and those of the target surface.
    This first example of method makes it possible to obtain a totally smooth generating surface 12. The transition from one local variation to another is smooth.
    To establish the relationship of the correlation step, in particular as in this first method, it is fixed as a condition to establish a bijection between the object points and the target points. Thus, the entire generating surface 12 is arranged in such a way that:
    each local variation deflects the incident light rays so as to form one and only one portion of the target pattern 16 ′ which is distinct from the portions of the target pattern formed by the other local variations, and
    - for the entire target pattern, each portion of the target pattern receives the light rays from one and only one local variation.
    This method provides good brightness gradients and good resolution. It can for example be used to make the generating surface 12 of FIG. 1.
    According to other methods, to improve the contrast and have darker areas and areas with maximum brightness, it is possible to arrange the local variations so that the generating surface 12 has one or more edges.
    Depending on the case, the generating surface 12 comprises:
    at least one edge delimiting portions of the generating surface with different orientations so as to generate a divergence such that certain zones of the target pattern receive almost no rays, if at all, thus forming dark zones, and / or
    - At least one edge delimiting portions of the generating surface with different orientations so as to generate a convergence such that certain zones of the target pattern receive the rays of several local variations and / or of several portions of this generating surface.
    This allows in particular to produce patterns with bright lines or very clear writing.
    For this, one can for example use a second calculation method to calculate the generating surface 12, disclosed in the document Schwartzburg et al. [2],
    In this second method, no bijection constraint is used in the correlation step. This method is more complex but makes it possible to obtain a contrast, namely a higher ratio between the light area and the dark area. This method makes it possible to obtain darker areas than those of the method of Yue and Al, mentioned previously. Thus, it is possible with this second method to obtain demarcations between dark zone and more marked light zone. The portions outside the edges are smooth, the transition from one local variation to the other being smooth.
    For example, in Figures 15a to 15f, the method used does not impose a bijection constraint to establish the target pattern. In certain places, several object points p 4 , p 5 correspond to a single target point p ' 4 . As a result, the generating surface 12 has a slope variation discontinuity, corresponding to an outgoing edge 18 on the generating surface 12, and therefore returning towards the incident rays. The local variations on either side of this edge 18 make it possible to concentrate the rays r4, r5 on a line of the target surface, for example to form a sharp intense line.
    Apart from this stop 18, notably above and below, the correlation step E3 has resulted, without having constrained it, in a bijective relationship between the corresponding object points pi, p 2 , P3 and the corresponding target points p'i, p ' 2 , p' 3 .
    Whatever the method used, each point of the generating surface 12 is therefore associated with an amplitude which corresponds to a deviation from the global form 13, this amplitude being defined in a direction parallel to the normal to the global form 13 at this point .
    For example, as illustrated in FIGS. 1 and 3, we consider a plane comprising the overall direction of the beam of incident rays. Consider in this plane, the rectangle 17, in which the caustic generator 10 is circumscribed, this rectangle 17 may have a side at least four times greater, in particular six times greater than that of the amplitude of each local variation relative to the global form given 13 at the level of this local variation, therefore greater than six times the maximum amplitude.
    Furthermore, the local variations can have a tangent t forming an angle a with the given overall shape of between -60 and 60 degrees, in particular between -30 and 30 degrees.
    By cumulating these slope and amplitude conditions one obtains optimal results, in particular in terms of contrast and sharpness, allowing in particular a propagation of the pattern propagated over the useful interval, in particular at the optimal distance D p .
    Note that the smaller the size of the light source 4, 6 of the beam generator 3 relative to the generating surface 12, the closer the projected pattern is to the desired pattern used for the construction of the generating surface. For example, the side of the rectangle 17 in which the caustic generator 10 is circumscribed can be at least ten times greater, in particular thirty times, than that of one side of this light source 3, 6, in particular when this source is a light emitting diode.
    The two embodiments of FIGS. 1 to 3 are aimed at caustic generators 10 operating by refraction.
    Here the generating surface 12 is formed on an optical element 10 specially dedicated for this purpose. However, it can also be formed on elements having other functions, such as a lens for closing the light device, an optical lens, a mask.
    In the application, the term "mask" designates the trim intended to mask certain elements, such as cables, the bottom of the housing. It is also called "bezel" in English.
    Furthermore, FIGS. 1 to 3 illustrate cases where the generating surface 12 is on the outlet face of the caustic generator 10. However, this is not limiting and in general, the optical element can have a surface generator on the input face and / or on the output face.
    FIG. 14 illustrates a third embodiment, according to which the optical element 10 ′ or caustic generator 10 ’operates by reflection.
    The caustic generator 10 ’is here a mirror whose reflecting surface forms the generating surface 12’, having local variations around its overall planar shape 13 ’.
    This 10 ’mirror can have one or more edges. Here, there is a re-entrant edge 18 ′, namely forming the bottom of a hollow, delimiting portions of surfaces with an orientation facing one another, these portions thus making it possible to create an intense luminous line of particular shape on the target motif, not shown.
    The same construction methods can be applied to this reflective generating surface 12 ′, taking into account during the different stages that it is a reflection and not a refraction.
    In such a case, the upstream step is simplified because the radii η, r 2 , r 3 , r 4 arrive directly on the generating surface 12 according to the given distribution and also leave directly therefrom.
    FIG. 7 illustrates a first example of a light device according to the invention. In the illustrated case, a vehicle 20 of longitudinal axis X is equipped with two light devices according to the invention, which are here a right rear light 21 and a left rear light 22.
    For example, these rear lights 21, 22 each comprise a housing and a window for closing the corresponding housing. Each closing glass includes a portion whose diopter between the glass and the outside forms the generating surface. Each of these generating surfaces receives part of the light rays from a light source of the corresponding rear light 21, 22. One could also provide a light source specially dedicated to this generating surface.
    The generating surface of the right rear light 21 is arranged to generate a target pattern 23 on the road forming a logo, here calling the following vehicles to vigilance.
    Figure 7 being an aerial view, this logo is stretched but will be perceived by the following vehicles as less stretched. The object motif, not shown, formed by the relief of the corresponding generating surface has a shape distorted from this target motif.
    In this example, it is understood that, according to the direction of propagation, the distance of the pattern between the generating surface and the target surface, namely the road, will vary depending on the attitude of the vehicle 20, for example if it is loaded or not. Here, the generating surface is arranged so that when the attitude of the vehicle 20 is horizontal on a horizontal road, the optimum distance D p given is greater, for example twice, than the distance between the generating surface and the road according to the direction of propagation of the propagated pattern. This makes it possible to have a visible net target pattern, whatever the orientation of the vehicle 20, in particular its trim. The target pattern therefore remains visible when climbing, descending, when braking or when accelerating, and whatever its load.
    In this example, the generating surface of the right rear light 21 receives the light rays from the light source making it possible to generate a stop light.
    Note that the lights could also be built according to the principle illustrated in FIGS. 1 and 3. In this case, instead of the generating surface being formed on the closing glass 9, closing the housing 8, it is, as described above formed on a transparent plate 10, specially designed to present the generating surface.
    FIG. 8 illustrates a second example of a light device according to the invention. This light device is a signaling light 31, here the right rear light.
    The light 31 comprises a housing 38 and a lens 39 for closing the housing through which the rays emitted by the light 31 emerge. The lens 39 is a grainy translucent plate, in particular sanded.
    Inside the housing 38, a caustic generator 10 is arranged in front of a beam generator 3 and receives the rays emitted by the latter on its entry face. The generating surface of the caustic generator 10 is formed on the outlet face of the latter and deflects the rays so as to distribute them over the majority, or even all of the glass 39. These rays are represented in FIG. 8 by the arrows in dashed.
    The ice 39 being grained it thus forms a screen, its interior surface to fire 31, forming the target surface. Thus the target pattern is formed on the glass 39.
    The caustic generator 10 may for example have a shape similar to that of the closing glass 39.
    The generating surface and the lens 39 are arranged so that the target pattern forms the illuminating surface of the signaling function and has the photometric distribution of a signaling light.
    Thus, a traffic light is formed with an aspect turned on, for example forming a rear position light beam, while having a different aspect off.
    FIG. 9 illustrates a third example of a light device according to the invention. This light device is a projector 41, which comprises a housing 48 and a lens 49 for closing the housing through which the rays emitted by the projector 41 emerge.
    A beam generator 3 is placed in the housing 48. The caustic generator is a lens 10 has a main portion 10a, which collects part of the light rays r f emitted by the beam generator 3 (only one is shown in FIG. 9 ). The main portion 10a of the lens is arranged so as to deflect these rays r f , so as to form a daytime running light. These rays r f pass through a main portion 49a of the ice 49.
    Another part of the rays emitted by the beam generator 3 are collected by a secondary portion 10b of the lens 10. This portion 10b can, as here, be arranged on the upper edge of the lens 10. These rays are shown in dotted lines in FIG. 9 .
    A caustic generating surface 12 is formed on the exit diopter of the secondary portion 10b of the lens 10. This generating surface 12 deflects the corresponding rays so as to distribute them over a secondary portion 49b of the ice 49.
    The secondary portion 49b of ice 49 being grained, it forms a screen, its inner surface 49c of the projector 41 forming the target surface. Thus, the target pattern is formed on the secondary portion 49b, positioned here at the top of the glass 49. This target pattern is visible from the outside.
    The generating surface 12 and the glass 49 are for example arranged so that the target pattern forms a logo.
    So with the same source, you can both perform a daytime running light function and display a pattern, such as a logo.
    According to a variant not shown, the projector can have a metallized mask, a portion of which has the generating surface. The lens can then be devoid of a generating surface and arranged with the beam generator so that a secondary part of the beam is reflected on the generating surface formed on the mask, to form the target pattern on the secondary portion of the ice. . In such a case, the arrangement is such that either the secondary part of the beam passes next to the lens, to directly reach the generating surface of the mask, or the lens is deflected towards this generating surface.
    FIG. 10 illustrates a fourth example of a light device 1 according to the invention, for example like that of FIG. 1. This light device 1 is in this example mounted inside the passenger compartment 50 of a vehicle, here on the rear plate 51.
    This light device 1 is for example, as here, arranged to project a target pattern 16 ’on a part of the interior surface 53 of the vehicle ceiling 52, a part of this interior surface 53 therefore forming the target surface.
    The target surface is slightly curved. In addition, the beam propagating the propagated pattern, represented here by its two limiting radii, illustrated by the dotted arrows, is grazing with respect to the ceiling 52. The arrangement of the local variations on the generating surface is made so as to take account of this, and so that the target pattern 16 'appears to the passengers as in FIG. 5.
    Figures 11 and 12 illustrate a fifth example of a light device according to the invention.
    This light device is arranged at the rear of a vehicle 100, at its rear bumper 102.
    The optical element 110, namely the caustic generator, comprises a reservoir 115 comprising a liquid 116 and air 117 forming between them a moving diopter 118. The reservoir 115 comprises a transparent inlet wall 121 and a transparent wall outlet 122 opposite the latter.
    The transparent outlet wall 122 comprises an inlet face 111 and an outlet face, on which the generating surface 112 of controlled caustic is formed.
    The light generator 103 is arranged so as to emit light rays vers towards the transparent entry wall 121, so that these rays Π pass successively: the transparent entry wall 121, the moving diopter 118, said face 111 then the generating surface 112. The rays η then exit from the tank 115, and therefore here from the light device, being oriented downwards and rearward relative to the vehicle 100, therefore in the direction of the road 125, that forms the target surface.
    All of these radii η are delimited by the limiting radii, illustrated by the dotted arrows.
    The light device is for example arranged so as to form a target pattern 16 ’, approximately such as that illustrated in FIG. 5, on the roadway 125, when the vehicle 100 is stopped, or at constant speed on a regular surface.
    In the event of starting, braking or acceleration, the moving diopter 118 is disturbed and deflects the spokes in a random and different manner depending on the points which form it. The target pattern 16 ’will then become disturbed, for example by having overlapping ripples or caustics, as in FIG. 13. Beyond a certain disturbance threshold, the target pattern will be lost.
    This embodiment can be used as a styling effect outside or inside the vehicle, but also as an indicator of a change in speed of the vehicle 100.
    List of references [1] Yonghao Yue, Kei Iwasaki, Bing-Yu Chen, Yoshinori Dobashi, Tomoyuki Nishita.
    Poisson-Based Continuous Surface Generation for Goal-Based Caustics, ACM Transactions on Graphies, Vol. 31, No. 3, Article 31 (May 2014).
    [2] Yuliy Schwartzburg, Romain Testuz, Andrea Tagliasacchi, Mark Pauly. Highcontrast Computational Caustic Design, ACM Transactions on Graphies (Proceedings of ACM SIGGRAPH 2014), Vol. 33, Issue 4, Article No. 74 (July 2014)
    权利要求:
    Claims (18)
    [1" id="c-fr-0001]
    1. Vehicle lighting device comprising:
    - an optical element (10; 10 ') having a generating surface (12; 12') of controlled caustic, this generating surface being a reflecting or refractive surface, extending according to a given overall shape (13; 13 ') and having local variations in shape around this given overall shape, these local variations being distributed over the whole of said generating surface so that they give the whole of the generating surface a relief forming an object pattern (15), different local variations being arranged so that the majority of said generating surface is smooth and so that for a beam of incident rays (n, r 2 , r 3 ) over the whole of said said generating surface, these rays having a given distribution, said generating surface deflects the rays according to different orientations according to the local variations which they meet, thus forming a deviated beam ié propagating an identifiable propagated pattern (16) over a useful interval extending upstream of and at least up to an optimal distance (D p ) of given finite propagation, this propagated motif corresponding to a distorted shape of the object motif,
    - a mounting part (2) on which is intended to be mounted a beam generator (3) of rays according to the given distribution, so that the rays are incident on said generating surface, the optical element being arranged to so that the propagated pattern is projected onto a target surface, which is visible from outside the light device and which is located within the useful interval and / or at a distance (Di, D 2 ) substantially equal to this so-called optimal distance.
    [2" id="c-fr-0002]
    2. Luminous device according to claim 1, in which the given distribution is substantially such that for any plane transverse to the direction of propagation, at a given point on this plane, the radius (s) (n, r 2 , r 3 ) incident (s) at this point comes from one direction.
    [3" id="c-fr-0003]
    3. Lighting system according to any one of the preceding claims, in which the given distribution corresponds to that of an incandescent light-emitting diode.
    [4" id="c-fr-0004]
    4. Light device according to any one of the preceding claims, in which the light device comprises the beam generator (3) of rays (n, r 2 , r 3 ) according to the given distribution.
    [5" id="c-fr-0005]
    5. Luminous device according to any one of the preceding claims, in which the generating surface comprises at least one smooth portion, the surface of which represents the majority of the generating surface (12; 12 '), the passage from a local variation to the the other being smooth inside this smooth portion.
    [6" id="c-fr-0006]
    6. Light device according to claim 5, wherein the entire generating surface (12) is smooth, the transition from one local variation to another being smooth.
    [7" id="c-fr-0007]
    7. Lighting device according to claim 6, in which the passage between certain local variations is formed by an edge (18, 18 ’).
    [8" id="c-fr-0008]
    8. Luminous device according to any one of the preceding claims, in which the beam generator (3) comprises a light-emitting diode (4,5).
    [9" id="c-fr-0009]
    9. Light device according to any one of the preceding claims, in which the beam generator (3) comprises a light source (6) and an optic (7) arranged with the light source so as to generate a beam of rays. (n, r 2 , r 3 ) substantially parallel.
    [10" id="c-fr-0010]
    10. Luminous device according to any one of the preceding claims, comprising a screen comprising a surface forming the target surface (19).
    [11" id="c-fr-0011]
    11. A light device according to claim 10, in which the screen is formed by a translucent diffusing plate (39) arranged in front of the beam generator.
    [12" id="c-fr-0012]
    12. A luminous device according to claim 11, comprising a housing (38) and a closing glass (39) of the housing through which exit the rays emitted by the luminous device, the closing glass forming the screen, the target surface. forming part or all of the portion of the closing glass through which these spokes come out.
    [13" id="c-fr-0013]
    13. Luminous device according to one of the preceding claims, in which the luminous device is a signaling light (31), the generating surface and the target surface being arranged so that the target pattern forms the illuminating surface of the function. signaling.
    [14" id="c-fr-0014]
    14. Light device according to one of the preceding claims, in which the light device (1) is intended to be mounted inside the passenger compartment (50) of a vehicle, said light device being arranged so that that once mounted in the vehicle, it can project the target pattern (16 ') on the one hand outside of said light device and on the other hand, on a surface (53) of the passenger compartment arranged at a distance of the optical element within the useful interval or substantially equal to said optimal distance (D p ).
    [15" id="c-fr-0015]
    15. Luminous device according to any one of the preceding claims, in which the optical element (10 ’) comprises a reflecting surface of which at least a portion is formed by the generating surface (12’).
    [16" id="c-fr-0016]
    16. A light device according to claim 14, wherein the optical element (10 ’) is a mask.
    [17" id="c-fr-0017]
    17. A light device according to any one of claims 1 to 14, comprising a housing and a lens for closing the housing through which the light rays emitted by the light device exit, the closure glass forming the optical element, the generating surface being formed on the surface of a portion of the closing glass, the deflected beam being formed by refraction of the rays emitted by the beam generator.
    5
    [0018]
    18. Luminous device according to one of the preceding claims, in which the optical element (110) comprises a reservoir (115) comprising a liquid (116) and air (117) forming between them a moving diopter (118) , the reservoir comprising a transparent inlet wall (121) and a transparent outlet wall (122) facing the transparent inlet wall, one of these walls 10 comprising said generating surface (112) , the light generator (103) being arranged so as to emit a light beam towards the transparent entry wall so that the rays (n) successively pass through the transparent entry wall, the moving diopter, and the wall transparent output, crossing said generating surface.
    1/8
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    FR3077363B1|2021-08-20|
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    FR3086735B1|2018-09-28|2021-06-25|Valeo Vision|MONOBLOC OPTICAL PART IN TRANSPARENT OR TRANSLUCENT MATERIAL WITH INACTIVE SURFACE WITH DIFFUSING PORTION|
    法律状态:
    2019-01-30| PLFP| Fee payment|Year of fee payment: 2 |
    2019-08-02| PLSC| Publication of the preliminary search report|Effective date: 20190802 |
    2020-01-31| PLFP| Fee payment|Year of fee payment: 3 |
    2021-01-28| PLFP| Fee payment|Year of fee payment: 4 |
    2022-01-31| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1850758|2018-01-30|
    FR1850758A|FR3077363B1|2018-01-30|2018-01-30|LUMINOUS DEVICE WITH CONTROLLED CAUSTIC-GENERATING SURFACE FORMING A PATTERN ON A TARGET SURFACE|FR1850758A| FR3077363B1|2018-01-30|2018-01-30|LUMINOUS DEVICE WITH CONTROLLED CAUSTIC-GENERATING SURFACE FORMING A PATTERN ON A TARGET SURFACE|
    EP19154048.3A| EP3517829A1|2018-01-30|2019-01-28|Light device with a controlled caustic generating surface forming a pattern on a target surface|
    US16/262,109| US10775019B2|2018-01-30|2019-01-30|Controlled caustic generator surface lighting device forming a pattern on a target surface|
    CN201910093505.XA| CN110094696B|2018-01-30|2019-01-30|Controlled caustic surface illuminator for patterning a target surface|
    US16/943,599| US11079092B2|2018-01-30|2020-07-30|Controlled caustic generator surface lighting device forming a pattern on a target surface|
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