EP3124854A1 - Lighting system for motor vehicle headlight - Google Patents

Lighting system for motor vehicle headlight Download PDF

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Publication number
EP3124854A1
EP3124854A1 EP16181306.8A EP16181306A EP3124854A1 EP 3124854 A1 EP3124854 A1 EP 3124854A1 EP 16181306 A EP16181306 A EP 16181306A EP 3124854 A1 EP3124854 A1 EP 3124854A1
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EP
European Patent Office
Prior art keywords
lighting system
primary optical
primary
light beam
rays
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16181306.8A
Other languages
German (de)
French (fr)
Other versions
EP3124854B1 (en
Inventor
Maxime LAMINETTE
Yves Gromfeld
Sylvain Giraud
Jean-François Doha
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Vision SAS
Original Assignee
Valeo Vision SAS
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Filing date
Publication date
Application filed by Valeo Vision SAS filed Critical Valeo Vision SAS
Priority to EP18186347.3A priority Critical patent/EP3415810A1/en
Priority to PL16181306T priority patent/PL3124854T3/en
Publication of EP3124854A1 publication Critical patent/EP3124854A1/en
Application granted granted Critical
Publication of EP3124854B1 publication Critical patent/EP3124854B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/24—Light guides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/26—Elongated lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/265—Composite lenses; Lenses with a patch-like shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/27—Thick lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/322—Optical layout thereof the reflector using total internal reflection
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • F21V5/04—Refractors for light sources of lens shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Definitions

  • the present invention relates to a lighting system.
  • a preferred application relates to the automotive industry for the production of signaling and / or lighting devices, in particular vehicle headlights.
  • this beam has a cut in the upper part with a horizontal portion, preferably about 0.57 degrees below the horizon, so as not to illuminate the area in which should be the driver of a vehicle coming in the opposite direction .
  • Many of these light emitting devices are generally horizontally aligned at an optical block at the front of a vehicle, thereby forming a lighting system.
  • the output portions of the different devices are thus visible from the front of a vehicle, through the ice of the optical unit.
  • These output portions each consist of a surface of spherical shape or a surface corresponding to a torus portion for example. They are offset relative to each other, being more or less close to the ice, depending on the possibilities of positioning and electrical connection of the devices in the space available within the optical unit.
  • the exit surface thus formed by the plurality of exit portions is relatively unsightly and does not allow the curvature continuity to be maintained. the corresponding ice cream.
  • the object of the invention is thus to provide a lighting system whose outlet surface is curved, and follows the profile of the ice placed downstream.
  • the present invention thus relates to a lighting system for a motor vehicle comprising at least one primary optical device for emitting a light beam having a cut-off profile, the primary optical emission device comprising at least one light source and a monobloc primary optical member comprising an input surface adapted to receive a light beam emitted by the light source, a beam intercepting surface configured to form the cutoff profile in the received light beam and an output surface 8 of said beam luminous.
  • It can be a flat, horizontal or oblique cutoff profile. Alternatively, it may be a cutoff profile having two portions of flat cuts at an angle between them, for example 15 °.
  • the primary optical element is made of a material able to allow the propagation of the light beam within it, from the entrance surface to the exit surface by total internal reflections on the internal walls of the optical member. primary.
  • the invention thus makes it possible to create an infinity-projected LED beam, using only two optical devices, namely a primary optical emission device whose function consists in producing a cut-off profile, and a projection device of which the functions are to return the beam to infinity and present a curved and aesthetic output surface.
  • a primary optical emission device whose function consists in producing a cut-off profile
  • the primary optical emission device unsightly, will not be visible through the ice, and only the exit surface of the projection device will be visible.
  • Each primary optical transmission device contains, for example, a dioptric folding machine which makes it possible to produce the cutoff profile, like that described in the publication. FR3010772 . All the rays emitted by the light source of the emission device are focused on this dioptric folder, which then reflects these rays to an output surface of the primary optical transmission device.
  • the projection device is common for all the primary optical transmission devices, and therefore has a single curved exit surface, to address the technical problem.
  • the projection device consists of a projection lens.
  • the primary optical element has an input portion comprising the input face and arranged to form a primary image of the light source at the intercept surface.
  • the input face of the primary optical element through which the rays coming from the source penetrate, has a cavity shape.
  • This cavity has a convex surface portion towards a first focus where the source is located and advantageously symmetrical revolution along the optical axis of the primary optical element.
  • This convex surface is surrounded by a concave orientation surface, also of revolution along the optical axis of the primary optical element.
  • the concave surface is preferably spherical with a center that coincides with the first focus where the source is located.
  • the input portion is arranged to focus, for example by reflections, the light beam received at a second focus disposed at an edge of the intercepting surface.
  • the primary image is a real image of the light source.
  • the input portion may for example be a concentration collimator.
  • the input portion may comprise an ellipsoidal profile wall.
  • the primary optical element comprises an intermediate portion, extending advantageously along its optical axis as the input portion. It nevertheless has a geometrical rupture zone revealed by a hollow zone.
  • This zone forms a cavity relief in the direction of the heart of the primary optical element, towards its optical axis.
  • This hollow area can take various forms. Overall, it may be, in vertical sectional view, a notch defined by the sides of a dihedron forming an angle whose apex is directed towards the interior of the intermediate zone and constitutes a corresponding ridge instead of secondary foci. This ridge is the portion of the space where the rays interfere with the recessed area.
  • This interference part forms the interception surface allowing the creation of a cutoff profile.
  • the interception surface is at the interface with the environment surrounding the primary optical element, such as air, so that a diopter is produced at this level.
  • the rays from the source are directed by the input portion so as to converge towards the secondary focus location on the intercept surface.
  • the ray concentration can be in a quasi-point area, which implies that the input portion concentrates the reflected rays at a point or a small area of space around a midpoint whatever the place of reflection on the wall. The place of secondary foci will then be formed according to a point of focus.
  • the location of secondary foci can still be formed along a line of focus.
  • the shape of intercept surface and the focus adopted determine the cut.
  • the primary optical element finally comprises an output portion comprising the output face and arranged to form a secondary image of the primary image, the projection device being arranged to project said secondary image.
  • This output portion is arranged to form a virtual secondary image of the primary image at a third focus or a line of third foci.
  • the projection device has a focus or line of homes coincident with the third focus or the line of third homes.
  • the secondary image may be located upstream or downstream of the output face of the primary optical element.
  • Another object of the invention is a vehicle equipped with at least one lighting system as described above.
  • vertical and horizontal are used in the present description to designate directions, including beam-cutting directions, in an orientation perpendicular to the horizon plane for the term “vertical”, and in a parallel orientation. in terms of the horizon for the term “horizontal”. They are to be considered in the operating conditions of the device in a vehicle. The use of these words does not mean that slight variations around the vertical and horizontal directions are excluded from the invention. For example, an inclination relative to these directions of the order of + or - 10 ° is here considered as a minor variation around the two preferred directions.
  • parallel or the concept of axes includes here in particular with manufacturing or mounting tolerances, substantially parallel directions or substantially coinciding axes within this framework.
  • the cuts produced by the system of the invention may furthermore have any orientation in space.
  • the cut-off profile preferably refers to the formation of an output beam that is not uniformly distributed around the optical axis due to the presence of a zone of least light exposure, this zone being substantially delimited by a cut-off profile. which can be flat or oblique.
  • the lighting system comprises a light source 1 configured to emit light rays with a mean direction oriented along an axis coincident with an optical axis X of the system.
  • the light source 1 may consist of one or more sources and more particularly of one or more light-emitting diodes (LEDs). In the case of a plurality of LEDs, it is advantageous to position them in the same plane.
  • the light source 1 consists of a single LED.
  • the light source 1 cooperates with a primary optical element 2 having an ovoid shape.
  • the primary optical element 2 comprises first an inlet portion 3.
  • the latter includes a face 6 through which the rays 11 coming from the source 1 enter.
  • the face 6 has a cavity shape of so as to produce an optical member whose focus receives the source 1.
  • the cavity has a surface portion 6b, convex towards the home where the source 1 is located and advantageously symmetrical of revolution along the optical axis.
  • the surface 6b is surrounded by a surface 6a, also of revolution along the optical axis X and concave orientation.
  • the surface 6a is preferably spherical with a center coinciding with the first focus where the source 1 is located.
  • the radii 11 propagate in the input portion 3 and are maintained in the primary optical element 2 by reflection on the peripheral wall 7 of the input portion 3.
  • the latter has a dioptric function to operate a redirection of the spokes 11 to an intermediate portion 4 of the primary optical member 3 where a cut occurs, before leaving by a output portion 5.
  • the peripheral wall 7 of the input portion 3 is configured to focus the reflected rays 11 to a focusing location 9 also referred to herein as the location of secondary foci 9.
  • the wall 12 is constructed as a result of the desired focus.
  • the intermediate portion 4 advantageously extends along the optical axis X as the input portion 3. It nevertheless comprises a geometrical rupture zone revealed by the recessed zone 10.
  • This zone 10 forms a cavity relief in the direction of the core of the primary optical element 2, towards the optical axis X.
  • This hollow zone 10 can take various forms. Overall, it may be, in vertical sectional view, a notch defined by the sides of a dihedron forming an angle whose apex is directed towards the interior of the intermediate zone 4 and constitutes a ridge corresponding to the place This peak is therefore the portion of the space where the radii 11 interfere with the recessed zone 10.
  • This interference part forms the interception surface allowing the creation of a cutoff profile.
  • the intercepting surface is at the interface with the environment surrounding the primary optical element 2, such as air, so that a diopter is produced at this level.
  • the rays coming from the source 1 are directed by the input portion 3 so as to converge towards the place of secondary foci 9 located on the interception surface.
  • the ray concentration can be in a quasi-point area, which implies that the input portion 3 concentrates the reflected rays 11 at a point or a small area of the space around a median point regardless of the location of the reflection on the wall 7.
  • the location of secondary foci 9 will then be formed according to a point of focus.
  • the location of secondary foci 9 can be further formed along a line of focus.
  • all the rays 11 emitted from a point of the source 1 and contained in a vertical plane passing through this point focus at a point of the place of foci 9 and the rays emitted by the point of the source and contained in a non-vertical plane passing through this point are reflected in parallel directions to each other.
  • the interception surface shape and the focus adopted determine the cutoff.
  • the rays that are not intercepted by the intercepting surface are propagated towards the output portion 5 of the primary optical member 2.
  • This latter portion 5 acts as a projection lens and delivers the output beam 12 through an exit surface 8.
  • This beam 12 is composed of rays parallel to each other as well in a vertical plane (as is visible on the figure 1 ) only in a horizontal plane. The beam is thus directed to infinity thanks to the projection lens.
  • This outlet surface 8 is positioned just upstream of a transparent protective glass of the lighting system, and is therefore visible through this mirror.
  • the figure 2 corresponds to a possible configuration of the present invention. It takes over the lighting system of the figure 1 , as described above, with a modified output portion 5, and with the addition of a second primary optical element 14 downstream of the first primary optical element 2 and upstream of the protective glass (not shown in FIG. this figure).
  • the output portion 5 is modified in that the exit surface 8 now consists of a concentration lens 8 which slightly deflects the rays so as to concentrate them.
  • its concentration power is strong horizontally and vertically low.
  • the beam 13 at the output of the first primary optical element 2 is no longer directed towards infinity, but is divergent as is shown in FIG. figure 2 .
  • This divergent beam 13 then passes through a second primary optical element 14 which corresponds to a projection lens 14 and which delivers an output beam 17 directed towards infinity.
  • This lens comprises an entrance surface 15 and an exit surface 16.
  • the lighting system according to the invention thus comprises a device for emitting a light beam with a cut-off profile, corresponding to the first primary optical element 2, and a device for projecting the light beam at infinity corresponding to the second primary optical organ 14.
  • the surface visible through the protective glass of the lighting system is no longer the exit surface 8 of the first primary optical element 2, but the exit surface 16 of the second primary optical element 14, that is to say the exit surface 16 of the device projection 14.
  • projection lens 14 will be used in the following description.
  • the lighting system comprises several aligned emission devices.
  • the lighting system according to the invention may comprise one or more devices 2 for transmitting a light beam, but still comprises only a single projection lens 14, as illustrated in FIG. figure 3 .
  • the lighting system according to the invention may comprise one or more devices 2 for transmitting a light beam, but still comprises only a single projection lens 14, as illustrated in FIG. figure 3 .
  • the figure 3 shows in this case four emission devices 2 and a projection lens 14.
  • the x, y and z axes are identified in order to better define the orientations of the planes and radii in the following description.
  • the x and y axes are in a horizontal plane and the z axis is in a vertical plane.
  • the transmission devices 2 are arranged on the same horizontal plane and share a same line of focus 9 of the light rays at a ray intercepting surface configured to form the cutoff profile. These emission devices 2 operate simultaneously to create a high beam.
  • the figure 4 shows the path of the light rays through the lighting system according to the figure 3 , in a horizontal plane.
  • the rays originate from the four light sources 1, are reflected on the walls 7, focus on interception surfaces at the location of secondary foci 9, then are directed to the exit surfaces 8 of the emission devices 2.
  • the exit surfaces 8 have a role of concentration lens, with a relatively strong horizontal power, for concentrating the rays of the same beam almost parallel to each other in the direction of the optical axis E x of the corresponding transmission device 2 (see figure 6 ).
  • the four beams coming out of the four emission devices 2 are obviously not parallel to each other.
  • the figure 5 shows the path of the light rays through the lighting system according to the figure 3 , in a vertical plane.
  • the exit surfaces 8 consist of concentrating lenses 8 which have only a small vertical power and which deviate only slightly the rays.
  • the four beams coming out of the four emission devices 2 are therefore composed of vertically diverging rays. They then reach the entrance surface 15 of the projection lens 14. This input surface 15 reorients all the radii of all the beams almost in parallel in the same direction parallel to the direction of the general optical axis X of the projection system. 'lighting.
  • the four beams finally reach the exit surface 16 whose vertical power is low, but sufficient to ensure that all the beams of all the beams are oriented perfectly parallel to the general optical axis X.
  • the figure 6 corresponds to the figure 4 with the schematization of the dimensions of the devices and orientations of the optical axes, the references of the parts not being inscribed for more legibility.
  • the general optical axis X of the lighting system is represented under the lighting devices 2 and the projection lens 14. It represents the direction of the beams 17 in output of the lighting system, which are directed to infinity.
  • the optical axes E 1 to E 4 of the lighting devices are inclined with respect to the general optical axis X, respectively of an angle ⁇ 1 to ⁇ 4 . This inclination can rise to 45 ° for example, depending on the desired beam width at the output of the lighting system.
  • the projection lens 14 is not arranged perpendicularly to the general optical axis X of the lighting system.
  • the exit surface 16 of the projection lens 14 is inclined at an angle ⁇ , for example 14 °, with respect to the perpendicular to the general optical axis X. This angle ⁇ depends on the orientation of ice.
  • the thickness a of the projection lens 14 is variable between 2mm and 40mm.
  • Its length b is at least as great as the total addition of the widths of the four emission devices 2 so as to cover and hide them, as illustrated in FIG. figure 7 especially.
  • This length b is preferably of the order of 80 mm.
  • the length e of the emission devices is preferably between 20 mm and 70 mm.
  • the projection lens 14 may be located, for example, only 20mm from the exit surfaces 8 of the transmission device in order to obtain the most compact lighting system possible.
  • the shape of the exit surface of each emission device 2 is adapted to the shape of the entrance surface of the projection lens 14 to limit optical aberrations and improve the performance of the lighting system.
  • the figure 7 is a front view of the lighting system, which shows the exit surface 16 of the projection lens 14 which hides the emission devices 2.
  • the inclination ⁇ of the lighting system relative to the horizontal may be 3 ° for example. It is therefore a minor inclination to the horizontal, as was announced at the beginning of the description in the definition of the term "horizontal".
  • the height c of the lighting system is for example 25mm, and the total length d is 130mm.
  • the exit surface 16 is concave with a radius of preferably 140 mm.
  • this exit surface 16 is mostly a style surface, which can take various other forms.
  • this exit surface 16 is formed by a scan of two rays, namely a vertical radius 18 scanned on a horizontal radius 19.
  • the inlet and outlet surfaces 16 of the projection lens 14 are made of transparent thermoplastic polymer, of the polycarbonate (PA) or polymethylmethacrylate (PMMA) type. They can also be made of silicone or other transparent materials, in particular depending on the desired refractive index.
  • the output surface 16 is a non-modifiable input parameter since its purpose is to follow the ice curve, the input surface 15 is an optical resultant to guarantee the Fermat optical principle. Its shape can be convex, concave or free form.
  • the entrance surface 15 can be made in a number of ways, depending on the type of projection lens desired. It can be concave, as can be seen in figure 10a if a focus line lens 20 is desired. This is the case described in figure 4 with the virtual focus line 18.
  • the input surface 15 is discretized with four sections 25 26 27 28 interconnected. Each section is adapted to the type of light placed upstream. In the example in figure 11 , the first section 25 and the fourth section are adapted to types of light that deliver a rather concentrated and intense lighting. The second 26 and third sections 27 are adapted to light types that will produce a rather low intensity lighting and spread horizontally. These four types of light work simultaneously to create a low beam. Unlike the high beams described above, the secondary focus lines of these four lights are not aligned.
  • the last figure 12 shows an example of integration of such a lighting system in a conventional lighting module with a radiator 24 and an electronic card 23 supplying the various LEDs.
  • a protective housing 22 integral with the ice at least partially surrounds the lighting system.

Abstract

Système d'éclairage pour véhicule automobile comprenant au moins un dispositif optique primaire d'émission 2 d'un faisceau lumineux présentant un profil de coupure, le dispositif optique primaire d'émission 2 comportant au moins une source lumineuse 1 et un organe optique primaire 2 monobloc comprenant une surface d'entrée 6 apte à recevoir un faisceau lumineux émis par la source lumineuse 1, une surface d'interception de rayons configurée pour former le profil de coupure dans le faisceau lumineux reçu et une surface de sortie 8 dudit faisceau lumineux,Lighting system for a motor vehicle comprising at least one primary optical device 2 for emitting a light beam having a cut-off profile, the primary optical emission device 2 comprising at least one light source 1 and a primary optical element 2 monoblock comprising an input surface 6 adapted to receive a light beam emitted by the light source 1, a ray intercepting surface configured to form the cutoff profile in the received light beam and an output surface 8 of said light beam,

Ce système se caractérise en ce qu'il comprend également un dispositif de projection 14 disposé en aval du (des) dispositif(s) optique(s) primaire(s) d'émission 2 et comprenant :
- une surface d'entrée 15 disposée en vis-à-vis du (des) dispositif(s) optique(s) primaire(s) d'émission 2, et par laquelle sont introduits des rayons du faisceau lumineux issus en sortie du (des) dispositif(s) optique(s) primaire(s) d'émission 2 ;
- une unique surface de sortie 16 continue par laquelle est projeté le faisceau lumineux 17.

Figure imgaf001
This system is characterized in that it also comprises a projection device 14 disposed downstream of the optical transmission device (s) 2 and comprising:
an input surface disposed opposite the primary optical transmission device (s) 2, and through which light beam rays coming out of the light source are introduced (FIG. optical device (s) primary (s) emission (s) 2;
a single continuous exit surface 16 through which the light beam 17 is projected.
Figure imgaf001

Description

Domaine de l'inventionField of the invention

La présente invention est relative à un système d'éclairage.The present invention relates to a lighting system.

Une application préférée concerne l'industrie automobile pour la réalisation de dispositifs de signalisation et/ ou d'éclairage, notamment de projecteurs de véhicule.A preferred application relates to the automotive industry for the production of signaling and / or lighting devices, in particular vehicle headlights.

Dans ce dernier domaine, on connait des modules d'éclairage ou projecteurs, parmi lesquels on trouve traditionnellement des feux de croisement, ou codes, de portée sur la route avoisinant les 70 mètres, qui sont utilisés essentiellement la nuit et dont la répartition du faisceau lumineux est telle qu'elle permet de ne pas éblouir le conducteur d'un véhicule croisé. Typiquement, ce faisceau présente une coupure en partie supérieure avec une portion horizontale, préférentiellement environ 0,57 degrés en dessous de l'horizon, afin de ne pas éclairer la zone dans laquelle devrait se trouver le conducteur d'un véhicule arrivant en sens inverse.In the latter area, we know lighting modules or projectors, among which are traditionally found low beam, or codes, range on the road around 70 meters, which are used primarily at night and whose beam distribution light is such that it does not dazzle the driver of a crossover vehicle. Typically, this beam has a cut in the upper part with a horizontal portion, preferably about 0.57 degrees below the horizon, so as not to illuminate the area in which should be the driver of a vehicle coming in the opposite direction .

Dans ce domaine, on trouve également des feux de route, ainsi que des feux antibrouillards, présentant tous les deux un faisceau à coupure.In this area, there are also high beam, as well as fog lamps, both having a cut-off beam.

Etat de la techniqueState of the art

La publication FR3010772 s'inscrit dans le cadre de cette technologie en formant un dispositif d'émission de lumière qui génère un faisceau avec un profil à coupure, ce dispositif comprenant :

  • une source lumineuse ;
  • un organe optique primaire de propagation de rayons lumineux, formé d'une seule pièce pleine et comprenant : une portion d'entrée par laquelle sont introduits dans l'organe optique primaire des rayons issus de la source lumineuse, et une portion de sortie par laquelle est projeté le faisceau lumineux de sortie ;
  • une surface d'interception de rayons configurée pour former le profil de coupure, et consistant en une paroi de l'organe optique primaire située dans une portion intermédiaire de l'organe optique primaire entre la portion d'entrée et la portion de sortie suivant l'axe optique.
The publication FR3010772 is part of this technology by forming a light emitting device which generates a beam with a cut-off profile, this device comprising:
  • a light source;
  • a primary optical element for propagation of light rays, formed in one solid piece and comprising: an input portion through which rays coming from the light source are introduced into the primary optical element, and an output portion through which is projected the light beam output;
  • a spoke interception surface configured to form the cutoff profile, and consisting of a wall of the primary optical member located in an intermediate portion of the primary optical member between the input portion and the output portion according to the optical axis.

Plusieurs de ces dispositifs d'émission de lumière sont généralement alignés horizontalement au niveau d'un bloc optique à l'avant d'un véhicule, formant alors un système d'éclairage.Many of these light emitting devices are generally horizontally aligned at an optical block at the front of a vehicle, thereby forming a lighting system.

Les portions de sortie des différents dispositifs sont ainsi visibles depuis l'avant d'un véhicule, à travers la glace du bloc optique. Ces portions de sortie consistent chacune en une surface d'allure sphérique ou en une surface correspondant à une portion de tore par exemple. Elles sont décalées les unes par rapport aux autres, en étant plus ou moins proche de la glace, en fonction des possibilités de positionnement et de raccordement électrique des dispositifs dans l'espace disponible au sein du bloc optique.The output portions of the different devices are thus visible from the front of a vehicle, through the ice of the optical unit. These output portions each consist of a surface of spherical shape or a surface corresponding to a torus portion for example. They are offset relative to each other, being more or less close to the ice, depending on the possibilities of positioning and electrical connection of the devices in the space available within the optical unit.

Or la nouvelle tendance est d'avoir des systèmes d'éclairage de plus en plus compacts, et dont les surfaces de sortie suivent le profil galbé des glaces.But the new trend is to have lighting systems increasingly compact, and whose exit surfaces follow the curved profile of ice.

Pour un arrangement de système d'éclairage classique, avec les dispositifs décalés et les différentes formes de portions de sortie, la surface de sortie ainsi formée par la pluralité de portions de sortie est relativement inesthétique et ne permet pas de garder la continuité en courbure de la glace correspondante.For a conventional lighting system arrangement, with the staggered devices and the various output portion shapes, the exit surface thus formed by the plurality of exit portions is relatively unsightly and does not allow the curvature continuity to be maintained. the corresponding ice cream.

L'objectif de l'invention consiste ainsi à proposer un système d'éclairage dont la surface de sortie est galbée, et suit le profil de la glace placée en aval.The object of the invention is thus to provide a lighting system whose outlet surface is curved, and follows the profile of the ice placed downstream.

Résumé de l'inventionSummary of the invention

La présente invention se rapporte ainsi à un système d'éclairage pour véhicule automobile comprenant au moins un dispositif optique primaire d'émission d'un faisceau lumineux présentant un profil de coupure, le dispositif optique primaire d'émission comportant au moins une source lumineuse et un organe optique primaire monobloc comprenant une surface d'entrée apte à recevoir un faisceau lumineux émis par la source lumineuse, une surface d'interception de rayons configurée pour former le profil de coupure dans le faisceau lumineux reçu et une surface de sortie 8 dudit faisceau lumineux.The present invention thus relates to a lighting system for a motor vehicle comprising at least one primary optical device for emitting a light beam having a cut-off profile, the primary optical emission device comprising at least one light source and a monobloc primary optical member comprising an input surface adapted to receive a light beam emitted by the light source, a beam intercepting surface configured to form the cutoff profile in the received light beam and an output surface 8 of said beam luminous.

Il peut s'agir d'un profil de coupure plate, horizontale ou encore oblique. En variante, il peut s'agir d'un profil de coupure comportant deux portions de coupures plates faisant un angle entre elles, par exemple de 15°.It can be a flat, horizontal or oblique cutoff profile. Alternatively, it may be a cutoff profile having two portions of flat cuts at an angle between them, for example 15 °.

De façon avantageuse, l'organe optique primaire est réalisé dans un matériau apte à autoriser la propagation du faisceau lumineux en son sein, de la surface d'entrée à la surface de sortie par réflexions internes totales sur les parois internes de l'organe optique primaire.Advantageously, the primary optical element is made of a material able to allow the propagation of the light beam within it, from the entrance surface to the exit surface by total internal reflections on the internal walls of the optical member. primary.

A titre principal, ce système d'éclairage se caractérise en ce qu'il comprend également un dispositif de projection disposé en aval du (des) dispositif(s) optique(s) primaire(s) d'émission et comprenant :

  • une surface d'entrée disposée en vis-à-vis du (des) dispositif(s) optique(s) primaire(s) d'émission, et par laquelle sont introduits des rayons du faisceau lumineux issus en sortie du (des) dispositif(s) optique(s) primaire(s) d'émission ;
  • une unique surface de sortie continue par laquelle est projeté le faisceau lumineux.
Mainly, this lighting system is characterized in that it also comprises a projection device disposed downstream of the optical device (s) primary (s) of emission and comprising:
  • an input surface disposed vis-à-vis the (the) optical device (s) (s) primary (s) emission, and by which are introduced rays of the light beam from the output of (the) device primary optical (s) of emission;
  • a single continuous exit surface through which the light beam is projected.

L'invention permet ainsi de créer un faisceau à led projeté à l'infini, en utilisant uniquement deux dispositifs optiques, à savoir un dispositif optique primaire d'émission dont la fonction consiste à réaliser un profil de coupure, et un dispositif de projection dont les fonctions sont de renvoyer le faisceau vers l'infini et de présenter une surface de sortie galbée et esthétique. Ainsi, le dispositif optique primaire d'émission, inesthétique, ne sera pas visible à travers la glace, et seule la surface de sortie du dispositif de projection sera visible.The invention thus makes it possible to create an infinity-projected LED beam, using only two optical devices, namely a primary optical emission device whose function consists in producing a cut-off profile, and a projection device of which the functions are to return the beam to infinity and present a curved and aesthetic output surface. Thus, the primary optical emission device, unsightly, will not be visible through the ice, and only the exit surface of the projection device will be visible.

Chaque dispositif optique primaire d'émission contient par exemple une plieuse dioptrique permettant la réalisation du profil de coupure, à l'instar de celle décrite dans la publication FR3010772 . L'ensemble des rayons émis par la source lumineuse du dispositif d'émission sont focalisés sur cette plieuse dioptrique, qui réfléchit ensuite ces rayons vers une surface de sortie du dispositif optique primaire d'émission.Each primary optical transmission device contains, for example, a dioptric folding machine which makes it possible to produce the cutoff profile, like that described in the publication. FR3010772 . All the rays emitted by the light source of the emission device are focused on this dioptric folder, which then reflects these rays to an output surface of the primary optical transmission device.

Ces rayons sont divergents en sortie du dispositif optique primaire d'émission et arrivent sur le dispositif de projection qui va collimater l'ensemble des rayons vers l'infini.These rays are divergent at the output of the primary optical emission device and arrive on the projection device which will collimate all the rays to infinity.

Le dispositif de projection est commun pour l'ensemble des dispositifs optiques primaires d'émission, et présente donc une unique surface de sortie galbée, permettant de répondre au problème technique posé.The projection device is common for all the primary optical transmission devices, and therefore has a single curved exit surface, to address the technical problem.

Concrètement, le dispositif de projection consiste en une lentille de projection.Concretely, the projection device consists of a projection lens.

L'organe optique primaire comporte une portion d'entrée comprenant la face d'entrée et agencée pour former une image primaire de la source lumineuse au niveau de la surface d'interception.The primary optical element has an input portion comprising the input face and arranged to form a primary image of the light source at the intercept surface.

Selon une configuration possible, la face d'entrée de l'organe optique primaire, par laquelle pénètrent les rayons issus de la source, a une forme en cavité. Cette cavité a une partie de surface convexe en direction d'un premier foyer où se situe la source et avantageusement symétrique de révolution suivant l'axe optique de l'organe optique primaire. Cette surface convexe est entourée d'une surface d'orientation concave, également de révolution suivant l'axe optique de l'organe optique primaire. La surface concave est préférentiellement sphérique de centre confondu au premier foyer où se situe la source.According to one possible configuration, the input face of the primary optical element, through which the rays coming from the source penetrate, has a cavity shape. This cavity has a convex surface portion towards a first focus where the source is located and advantageously symmetrical revolution along the optical axis of the primary optical element. This convex surface is surrounded by a concave orientation surface, also of revolution along the optical axis of the primary optical element. The concave surface is preferably spherical with a center that coincides with the first focus where the source is located.

Par exemple, la portion d'entrée est agencée pour concentrer, par exemple par réflexions, le faisceau lumineux reçu au niveau d'un second foyer disposé au niveau d'un bord de la surface d'interception. L'image primaire est dans ce cas une image réelle de la source lumineuse. La portion d'entrée peut par exemple être un collimateur de concentration. En variante, la portion d'entrée peut comporter une paroi de profil ellipsoïdal.For example, the input portion is arranged to focus, for example by reflections, the light beam received at a second focus disposed at an edge of the intercepting surface. In this case, the primary image is a real image of the light source. The input portion may for example be a concentration collimator. As a variant, the input portion may comprise an ellipsoidal profile wall.

Plus précisément, l'organe optique primaire comprend une portion intermédiaire, s'étendant avantageusement selon son axe optique comme la portion d'entrée. Elle comporte néanmoins une zone de rupture géométrique révélée par une zone en creux.More specifically, the primary optical element comprises an intermediate portion, extending advantageously along its optical axis as the input portion. It nevertheless has a geometrical rupture zone revealed by a hollow zone.

Cette zone forme un relief en cavité en direction du coeur de l'organe optique primaire, vers son axe optique.This zone forms a cavity relief in the direction of the heart of the primary optical element, towards its optical axis.

Cette zone en creux peut prendre diverses formes. Globalement, il peut s'agir, en vue en coupe verticale, d'une encoche définie par les pans d'un dièdre formant un angle dont le sommet est dirigé vers l'intérieur de la zone intermédiaire et constitue une crête correspondant au lieu de foyers secondaires. Cette crête est donc la portion de l'espace où les rayons interfèrent avec la zone en creux.This hollow area can take various forms. Overall, it may be, in vertical sectional view, a notch defined by the sides of a dihedron forming an angle whose apex is directed towards the interior of the intermediate zone and constitutes a corresponding ridge instead of secondary foci. This ridge is the portion of the space where the rays interfere with the recessed area.

Cette partie d'interférence forme la surface d'interception permettant la création d'un profil de coupure. La surface d'interception est à l'interface avec le milieu environnant l'organe optique primaire, tel que l'air si bien qu'un dioptre est produit à ce niveau.This interference part forms the interception surface allowing the creation of a cutoff profile. The interception surface is at the interface with the environment surrounding the primary optical element, such as air, so that a diopter is produced at this level.

Les rayons issus de la source sont dirigés par la portion d'entrée de sorte à converger vers le lieu de foyers secondaires situé sur la surface d'interception.The rays from the source are directed by the input portion so as to converge towards the secondary focus location on the intercept surface.

Selon une configuration possible, la concentration de rayons peut se faire dans une zone quasi-ponctuelle, ce qui implique que la portion d'entrée concentre les rayons réfléchis en un point ou en une petite zone de l'espace autour d'un point médian quel que soit le lieu de la réflexion sur la paroi. Le lieu des foyers secondaires sera alors formé selon un point de focalisation.According to one possible configuration, the ray concentration can be in a quasi-point area, which implies that the input portion concentrates the reflected rays at a point or a small area of space around a midpoint whatever the place of reflection on the wall. The place of secondary foci will then be formed according to a point of focus.

Selon une autre configuration possible, le lieu des foyers secondaires peut encore être formé selon une ligne de focalisation. Dans cette situation, tous les rayons émis d'un point de la source et contenus dans un plan vertical passant par ce point se focalisent en un point du lieu de foyers et les rayons émis par le point de la source et contenus dans un plan non vertical passant par ce point sont réfléchis dans des directions parallèles entre-elles.According to another possible configuration, the location of secondary foci can still be formed along a line of focus. In this situation, all the rays emitted from a point of the source and contained in a vertical plane passing through this point focus at a point of the place of foci and the rays emitted by the point of the source and contained in a non plane. vertical passing through this point are reflected in parallel directions between them.

Ainsi, au niveau du lieu de foyers secondaires, la forme de surface d'interception et la focalisation adoptée déterminent la coupure.Thus, at the location of secondary foci, the shape of intercept surface and the focus adopted determine the cut.

L'organe optique primaire comprend enfin une portion de sortie comprenant la face de sortie et agencée pour former une image secondaire de l'image primaire, le dispositif de projection étant agencé pour projeter ladite image secondaire.The primary optical element finally comprises an output portion comprising the output face and arranged to form a secondary image of the primary image, the projection device being arranged to project said secondary image.

Cette portion de sortie est agencée pour former une image secondaire virtuelle de l'image primaire au niveau d'un troisième foyer ou d'une ligne de troisièmes foyers. Le cas échéant, le dispositif de projection présente un foyer ou une ligne de foyers confondus avec le troisième foyer ou la ligne de troisièmes foyers. Eventuellement, l'image secondaire peut être située en amont ou en aval de la face de sortie de l'organe optique primaire.This output portion is arranged to form a virtual secondary image of the primary image at a third focus or a line of third foci. Where appropriate, the projection device has a focus or line of homes coincident with the third focus or the line of third homes. Optionally, the secondary image may be located upstream or downstream of the output face of the primary optical element.

D'autres caractéristiques, optionnelles et non limitatives, sont énoncées ci-après :

  • à partir de la surface de sortie de la lentille de projection, tous les rayons lumineux en provenance du (des) dispositif(s) optique(s) primaire(s) d'émission sont orientés parallèlement les uns aux autres dans une unique direction parallèle à l'axe optique X du système.
  • la surface d'entrée de la lentille de projection est continue.
  • le système d'éclairage comprend au moins deux dispositifs optiques primaires d'émission comportant chacun une source lumineuse et un organe optique primaire.
  • les dispositifs optiques primaires d'émission sont disposés sur un même plan horizontal et partagent une même ligne de focalisation des rayons lumineux au niveau des surfaces d'interceptions des rayons configurée pour former le profil de coupure.
  • la surface d'entrée de la lentille de projection est discontinue et se divise en plusieurs portions reliées les unes aux autres, chaque portion étant adaptée à et située en aval d'un dispositif optique primaire d'émission.
  • les dispositifs optiques primaires d'émission et le dispositif de projection sont formés dans un ensemble monobloc.
Other characteristics, optional and non-limiting, are set out below:
  • from the exit surface of the projection lens, all the light rays coming from the optical transmission device (s) are oriented parallel to each other in a single parallel direction to the optical axis X of the system.
  • the entrance surface of the projection lens is continuous.
  • the lighting system comprises at least two primary optical emission devices each comprising a light source and a primary optical element.
  • the primary optical emission devices are arranged on the same horizontal plane and share a same line of focus of the light rays at the interception surfaces of the rays configured to form the cutoff profile.
  • the input surface of the projection lens is discontinuous and divides into a plurality of portions connected to each other, each portion being adapted to and located downstream from a primary optical transmitting device.
  • the primary optical transmitting devices and the projection device are formed in a one-piece assembly.

Un autre objet de l'invention consiste en un véhicule équipé d'au moins un système d'éclairage tel que décrit ci-dessus.Another object of the invention is a vehicle equipped with at least one lighting system as described above.

Présentation des figuresPresentation of figures

L'invention sera mieux comprise, et d'autres buts, détails, caractéristiques et avantages de celle-ci apparaîtront plus clairement au cours de la description explicative détaillée qui va suivre, d'au moins un mode de réalisation de l'invention donné à titre d'exemple purement illustratif et non limitatif, en référence aux dessins schématiques annexés.The invention will be better understood, and other objects, details, features and advantages thereof will become more clearly apparent in the following detailed explanatory description of at least one embodiment of the invention given to title purely illustrative and non-limiting example, with reference to the accompanying schematic drawings.

Sur ces dessins :

  • la figure 1 est une vue en coupe selon un plan vertical passant par l'axe optique d'un exemple de réalisation d'un système d'éclairage selon l'art antérieur ;
  • la figure 2 est une vue en coupe selon un plan vertical passant par l'axe optique d'un exemple de réalisation d'un système d'éclairage selon l'invention ;
  • la figure 3 illustre en perspective le système d'éclairage de l'invention, selon l'exemple de la figure 2 ;
  • la figure 4 montre le système d'éclairage de l'invention avec la schématisation de la propagation de quelques rayons lumineux dans un plan horizontal ;
  • la figure 5 montre le système d'éclairage de l'invention avec la schématisation de la propagation de quelques rayons lumineux dans un plan vertical ;
  • la figure 6 montre le système d'éclairage de l'invention en vue de dessus comme la figure 4 ;
  • la figure 7 montre le système d'éclairage de l'invention en vue de face ;
  • les figures 8 et 9 représentent la lentille de projection en perspective, entièrement montée ;
  • les figures 10a et 10b montrent deux exemples de forme de surface d'entrée de la lentille de projection ;
  • la figure 11 illustre en vue de dessus un exemple de surface d'entrée discontinue de la lentille de projection ;
  • la figure 12 illustre en vue de dessus un exemple d'intégration du système d'éclairage dans un module d'éclairage avec un radiateur et une carte électronique.
On these drawings:
  • the figure 1 is a sectional view along a vertical plane passing through the optical axis of an exemplary embodiment of a lighting system according to the prior art;
  • the figure 2 is a sectional view along a vertical plane passing through the optical axis of an exemplary embodiment of a lighting system according to the invention;
  • the figure 3 illustrates in perspective the lighting system of the invention, according to the example of the figure 2 ;
  • the figure 4 shows the lighting system of the invention with the schematization of the propagation of some light rays in a horizontal plane;
  • the figure 5 shows the lighting system of the invention with the schematization of the propagation of some light rays in a vertical plane;
  • the figure 6 shows the lighting system of the invention in plan view as the figure 4 ;
  • the figure 7 shows the lighting system of the invention in front view;
  • the Figures 8 and 9 represent the projection lens in perspective, fully mounted;
  • the Figures 10a and 10b show two examples of the entrance surface shape of the projection lens;
  • the figure 11 illustrates in plan view an example of discontinuous input surface of the projection lens;
  • the figure 12 illustrates in top view an example of integration of the lighting system in a lighting module with a radiator and an electronic card.

Description détailléedetailed description

Les termes « vertical » et « horizontal » sont utilisés dans la présente description pour désigner des directions, notamment des directions de coupure de faisceau, suivant une orientation perpendiculaire au plan de l'horizon pour le terme « vertical », et suivant une orientation parallèle au plan de l'horizon pour le terme « horizontal ». Elles sont à considérer dans les conditions de fonctionnement du dispositif dans un véhicule. L'emploi de ces mots ne signifie pas que de légères variations autour des directions verticale et horizontale soient exclues de l'invention. Par exemple, une inclinaison relativement à ces directions de l'ordre de + ou - 10° est ici considérée comme une variation mineure autour des deux directions privilégiées.The terms "vertical" and "horizontal" are used in the present description to designate directions, including beam-cutting directions, in an orientation perpendicular to the horizon plane for the term "vertical", and in a parallel orientation. in terms of the horizon for the term "horizontal". They are to be considered in the operating conditions of the device in a vehicle. The use of these words does not mean that slight variations around the vertical and horizontal directions are excluded from the invention. For example, an inclination relative to these directions of the order of + or - 10 ° is here considered as a minor variation around the two preferred directions.

Le terme « parallèle » ou la notion d'axes confondus s'entend ici notamment avec les tolérances de fabrication ou de montage, des directions sensiblement parallèles ou des axes sensiblement confondus entre dans ce cadre.The term "parallel" or the concept of axes includes here in particular with manufacturing or mounting tolerances, substantially parallel directions or substantially coinciding axes within this framework.

Les coupures produites par le système de l'invention peuvent par ailleurs avoir toute orientation dans l'espace.The cuts produced by the system of the invention may furthermore have any orientation in space.

Le profil de coupure s'entend préférentiellement de la formation d'un faisceau de sortie non uniformément réparti autour de l'axe optique du fait de la présence d'une zone de moindre exposition lumineuse, cette zone étant sensiblement délimitée par un profil de coupure qui peut être plat ou oblique.The cut-off profile preferably refers to the formation of an output beam that is not uniformly distributed around the optical axis due to the presence of a zone of least light exposure, this zone being substantially delimited by a cut-off profile. which can be flat or oblique.

Le cas représenté aux différentes figures est particulièrement adapté à une implantation dans un projecteur à l'avant d'un véhicule automobile.The case shown in the various figures is particularly suitable for installation in a projector at the front of a motor vehicle.

En référence à la figure 1 correspondant à une illustration d'un exemple de l'art antérieur, le système d'éclairage comporte une source lumineuse 1 configurée pour émettre des rayons lumineux avec une direction moyenne orientée suivant un axe confondu avec un axe optique X du système.With reference to the figure 1 corresponding to an illustration of an example of the prior art, the lighting system comprises a light source 1 configured to emit light rays with a mean direction oriented along an axis coincident with an optical axis X of the system.

La source lumineuse 1 peut être constituée d'une ou plusieurs sources et plus particulièrement d'une ou plusieurs diodes électroluminescentes (LED). Dans le cas d'une pluralité de diodes (LED), il est avantageux de les positionner dans un même plan. Les LEDs émettant sensiblement dans un demi-espace limité par leur plan d'implantation, la direction moyenne d'émission est typiquement perpendiculaire au plan de la LED.The light source 1 may consist of one or more sources and more particularly of one or more light-emitting diodes (LEDs). In the case of a plurality of LEDs, it is advantageous to position them in the same plane. The LEDs emitting substantially in a half-space limited by their layout plan, the average direction of emission is typically perpendicular to the plane of the LED.

Dans le cas de l'exemple représenté, la source lumineuse 1 est constituée d'une seule LED. La source lumineuse 1 coopère avec un organe optique primaire 2 ayant une forme d'allure ovoïdale. Il existe d'autres variantes de formes possibles pour l'organe optique primaire 2.In the case of the example shown, the light source 1 consists of a single LED. The light source 1 cooperates with a primary optical element 2 having an ovoid shape. There are other variants of possible forms for the primary optical element 2.

D'une manière générale, l'organe optique primaire 2 comprend d'abord une portion d'entrée 3. Cette dernière inclut une face 6 par laquelle pénètrent les rayons 11 issus de la source 1. La face 6 a une forme en cavité de sorte à réaliser un organe optique dont le foyer reçoit la source 1. La cavité a une partie de surface 6b, convexe en direction du foyer où se situe la source 1 et avantageusement symétrique de révolution suivant l'axe optique. La surface 6b est entourée d'une surface 6a, également de révolution suivant l'axe optique X et d'orientation concave. La surface 6a est préférentiellement sphérique de centre confondu au premier foyer où se situe la source 1. Entrant par la face 6 ainsi définie, les rayons 11 se propagent dans la portion d'entrée 3 et sont maintenus dans l'organe optique primaire 2 par réflexion sur la paroi périphérique 7 de la portion d'entrée 3. Cette dernière à une fonction dioptrique pour opérer une redirection des rayons 11 vers une portion intermédiaire 4 de l'organe optique primaire 3 où se produit une coupure, avant de sortir par une portion de sortie 5.In general, the primary optical element 2 comprises first an inlet portion 3. The latter includes a face 6 through which the rays 11 coming from the source 1 enter. The face 6 has a cavity shape of so as to produce an optical member whose focus receives the source 1. The cavity has a surface portion 6b, convex towards the home where the source 1 is located and advantageously symmetrical of revolution along the optical axis. The surface 6b is surrounded by a surface 6a, also of revolution along the optical axis X and concave orientation. The surface 6a is preferably spherical with a center coinciding with the first focus where the source 1 is located. Entering through the face 6 thus defined, the radii 11 propagate in the input portion 3 and are maintained in the primary optical element 2 by reflection on the peripheral wall 7 of the input portion 3. The latter has a dioptric function to operate a redirection of the spokes 11 to an intermediate portion 4 of the primary optical member 3 where a cut occurs, before leaving by a output portion 5.

Plus précisément, la paroi périphérique 7 de la portion d'entrée 3 est configurée pour concentrer les rayons réfléchis 11 vers un lieu de focalisation 9 encore ici dénommé lieu de foyers secondaires 9. La paroi 12 est construite en conséquence de la focalisation souhaitée.More specifically, the peripheral wall 7 of the input portion 3 is configured to focus the reflected rays 11 to a focusing location 9 also referred to herein as the location of secondary foci 9. The wall 12 is constructed as a result of the desired focus.

La portion intermédiaire 4 s'étend avantageusement selon l'axe optique X comme la portion d'entrée 3. Elle comporte néanmoins une zone de rupture géométrique révélée par la zone en creux 10.The intermediate portion 4 advantageously extends along the optical axis X as the input portion 3. It nevertheless comprises a geometrical rupture zone revealed by the recessed zone 10.

Cette zone 10 forme un relief en cavité en direction du coeur de l'organe optique primaire 2, vers l'axe optique X.This zone 10 forms a cavity relief in the direction of the core of the primary optical element 2, towards the optical axis X.

Cette zone en creux 10 peut prendre diverses formes. Globalement, il peut s'agir, en vue en coupe verticale, d'une encoche définie par les pans d'un dièdre formant un angle dont le sommet est dirigé vers l'intérieur de la zone intermédiaire 4 et constitue une crête correspondant au lieu de foyers secondaires 9. Cette crête est donc la portion de l'espace où les rayons 11 interfèrent avec la zone en creux 10.This hollow zone 10 can take various forms. Overall, it may be, in vertical sectional view, a notch defined by the sides of a dihedron forming an angle whose apex is directed towards the interior of the intermediate zone 4 and constitutes a ridge corresponding to the place This peak is therefore the portion of the space where the radii 11 interfere with the recessed zone 10.

Cette partie d'interférence forme la surface d'interception permettant la création d'un profil de coupure. La surface d'interception est à l'interface avec le milieu environnant l'organe optique primaire 2, tel que l'air si bien qu'un dioptre est produit à ce niveau.This interference part forms the interception surface allowing the creation of a cutoff profile. The intercepting surface is at the interface with the environment surrounding the primary optical element 2, such as air, so that a diopter is produced at this level.

Les rayons issus de la source 1 sont dirigés par la portion d'entrée 3 de sorte à converger vers le lieu de foyers secondaires 9 situé sur la surface d'interception.The rays coming from the source 1 are directed by the input portion 3 so as to converge towards the place of secondary foci 9 located on the interception surface.

Selon une configuration possible, la concentration de rayons peut se faire dans une zone quasi-ponctuelle, ce qui implique que la portion d'entrée 3 concentre les rayons réfléchis 11 en un point ou en une petite zone de l'espace autour d'un point médian quel que soit le lieu de la réflexion sur la paroi 7. Le lieu des foyers secondaires 9 sera alors formé selon un point de focalisation.In one possible configuration, the ray concentration can be in a quasi-point area, which implies that the input portion 3 concentrates the reflected rays 11 at a point or a small area of the space around a median point regardless of the location of the reflection on the wall 7. The location of secondary foci 9 will then be formed according to a point of focus.

Selon une autre configuration possible, le lieu des foyers secondaires 9 peut encore être formé selon une ligne de focalisation. Dans cette situation, tous les rayons 11 émis d'un point de la source 1 et contenus dans un plan vertical passant par ce point se focalisent en un point du lieu de foyers 9 et les rayons émis par le point de la source et contenus dans un plan non vertical passant par ce point sont réfléchis dans des directions parallèles entre-elles.According to another possible configuration, the location of secondary foci 9 can be further formed along a line of focus. In this situation, all the rays 11 emitted from a point of the source 1 and contained in a vertical plane passing through this point focus at a point of the place of foci 9 and the rays emitted by the point of the source and contained in a non-vertical plane passing through this point are reflected in parallel directions to each other.

Ainsi, au niveau du lieu de foyers secondaires 9, la forme de surface d'interception et la focalisation adoptée déterminent la coupure.Thus, at the location of secondary foci 9, the interception surface shape and the focus adopted determine the cutoff.

Les rayons qui ne sont pas interceptés par la surface d'interception sont propagés vers la portion de sortie 5 de l'organe optique primaire 2. Cette dernière portion 5 agit comme lentille de projection et délivre le faisceau de sortie 12 par une surface de sortie 8.Ce faisceau 12 est composé de rayons parallèles les uns aux autres aussi bien dans un plan vertical (comme cela est visible sur la figure 1) que dans un plan horizontal. Le faisceau est ainsi dirigé à l'infini grâce à la lentille de projection. Cette surface de sortie 8 est positionnée juste en amont d'une glace transparente de protection du système d'éclairage, et est donc visible à travers cette glace.The rays that are not intercepted by the intercepting surface are propagated towards the output portion 5 of the primary optical member 2. This latter portion 5 acts as a projection lens and delivers the output beam 12 through an exit surface 8.This beam 12 is composed of rays parallel to each other as well in a vertical plane (as is visible on the figure 1 ) only in a horizontal plane. The beam is thus directed to infinity thanks to the projection lens. This outlet surface 8 is positioned just upstream of a transparent protective glass of the lighting system, and is therefore visible through this mirror.

La figure 2 correspond à une configuration possible de la présente invention. Elle reprend le système d'éclairage de la figure 1, tel que décrit ci-dessus, avec une portion de sortie 5 modifiée, et avec un l'ajout d'un second organe optique primaire 14 en aval du premier organe optique primaire 2 et en amont de la glace de protection (non représentée sur cette figure).The figure 2 corresponds to a possible configuration of the present invention. It takes over the lighting system of the figure 1 , as described above, with a modified output portion 5, and with the addition of a second primary optical element 14 downstream of the first primary optical element 2 and upstream of the protective glass (not shown in FIG. this figure).

En effet, la portion de sortie 5 est modifiée en ce que la surface de sortie 8 consiste désormais en une lentille de concentration 8 qui dévie légèrement les rayons de manière à les concentrer. Dans cet exemple, sa puissance de concentration est forte horizontalement et faible verticalement. Ainsi, le faisceau 13 en sortie du premier organe optique primaire 2 n'est plus dirigé vers l'infini, mais est divergent comme cela est montré en figure 2.Indeed, the output portion 5 is modified in that the exit surface 8 now consists of a concentration lens 8 which slightly deflects the rays so as to concentrate them. In this example, its concentration power is strong horizontally and vertically low. Thus, the beam 13 at the output of the first primary optical element 2 is no longer directed towards infinity, but is divergent as is shown in FIG. figure 2 .

Ce faisceau 13 divergent passe ensuite à travers un second organe optique primaire 14 qui correspond à une lentille de projection 14 et qui délivre un faisceau de sortie 17 dirigé vers l'infini. Cette lentille comprend une surface d'entrée 15 et une surface de sortie 16.This divergent beam 13 then passes through a second primary optical element 14 which corresponds to a projection lens 14 and which delivers an output beam 17 directed towards infinity. This lens comprises an entrance surface 15 and an exit surface 16.

Le système d'éclairage selon l'invention comprend ainsi un dispositif d'émission d'un faisceau lumineux avec un profil de coupure, correspondant au premier organe optique primaire 2, et un dispositif de projection du faisceau lumineux à l'infini correspondant au deuxième organe optique primaire 14.The lighting system according to the invention thus comprises a device for emitting a light beam with a cut-off profile, corresponding to the first primary optical element 2, and a device for projecting the light beam at infinity corresponding to the second primary optical organ 14.

La surface visible à travers la glace de protection du système d'éclairage n'est plus la surface de sortie 8 du premier organe optique primaire 2, mais la surface de sortie 16 du deuxième organe optique primaire 14, c'est-à-dire la surface de sortie 16 du dispositif de projection 14. Pour plus de clarté, on utilisera le terme lentille de projection 14 dans la suite de la description.The surface visible through the protective glass of the lighting system is no longer the exit surface 8 of the first primary optical element 2, but the exit surface 16 of the second primary optical element 14, that is to say the exit surface 16 of the device projection 14. For clarity, the term projection lens 14 will be used in the following description.

L'avantage que procure cette solution par rapport à celle de l'art antérieur, est qu'il est possible de faire prendre la forme désirée à la surface de sortie de la lentille de projection 14, de manière à ce qu'elle épouse la forme galbée et continue de la glace de protection. Ainsi, au lieu d'avoir une forme hémisphérique ou une forme de portion torique visible classiquement derrière la glace avec un décalage par rapport au profil de la glace, ce sera une forme semblable à celle de la glace qui sera visible à travers celle-ci.The advantage that this solution provides over that of the prior art is that it is possible to take the desired shape at the exit surface of the projection lens 14, so that it fits the curved and continuous shape of the protective glass. Thus, instead of having a hemispherical shape or a form of toric portion conventionally visible behind the ice with a shift with respect to the profile of the ice, it will be a shape similar to that of the ice that will be visible through it .

Cela est d'autant plus avantageux lorsque le système d'éclairage comprend plusieurs dispositifs d'émission alignés. En effet, le système d'éclairage selon l'invention peut comprendre un ou plusieurs dispositifs d'émission 2 d'un faisceau lumineux, mais ne comprend toujours qu'une unique lentille de projection 14, comme cela est illustré en figure 3. Ainsi, il n'y a toujours qu'une seule surface de sortie visible à travers la glace, et non pas plusieurs surfaces de sortie visibles avec plusieurs formes différentes, créant une ondulation inesthétique derrière la glace, comme dans l'art antérieur.This is all the more advantageous when the lighting system comprises several aligned emission devices. Indeed, the lighting system according to the invention may comprise one or more devices 2 for transmitting a light beam, but still comprises only a single projection lens 14, as illustrated in FIG. figure 3 . Thus, there is still only one visible exit surface through the ice, and not several visible exit surfaces with many different shapes, creating an unsightly ripple behind the ice, as in the prior art.

La figure 3 montre en l'occurrence quatre dispositifs d'émission 2 et une lentille de projection 14. Sur cette figure, les axes x, y et z sont repérés afin de pouvoir mieux définir les orientations des plans et des rayons dans la suite de la description. Les axes x et y se situent dans un plan d'allure horizontal et l'axe z se situe dans un plan d'allure vertical.The figure 3 shows in this case four emission devices 2 and a projection lens 14. In this figure, the x, y and z axes are identified in order to better define the orientations of the planes and radii in the following description. The x and y axes are in a horizontal plane and the z axis is in a vertical plane.

Dans l'exemple présenté, les dispositifs d'émission 2 sont disposés sur un même plan horizontal et partagent une même ligne de focalisation 9 des rayons lumineux au niveau d'une surface d'interception de rayons configurée pour former le profil de coupure. Ces dispositifs d'émission 2 fonctionnent simultanément pour créer un feu de route.In the example presented, the transmission devices 2 are arranged on the same horizontal plane and share a same line of focus 9 of the light rays at a ray intercepting surface configured to form the cutoff profile. These emission devices 2 operate simultaneously to create a high beam.

Le fait de retourner des dispositifs à 180° verticalement permet de créer un phare antibrouillard.Turning devices 180 ° vertically creates a fog light.

La figure 4 montre le chemin des rayons lumineux à travers le système d'éclairage selon la figure 3, dans un plan horizontal.The figure 4 shows the path of the light rays through the lighting system according to the figure 3 , in a horizontal plane.

Les rayons partent des quatre sources lumineuses 1, se réfléchissent sur les parois 7, se focalisent sur des surfaces d'interception au niveau du lieu de foyers secondaires 9, puis sont dirigés vers les surfaces de sortie 8 des dispositifs d'émission 2. Comme énoncé précédemment, les surfaces de sortie 8 ont un rôle de lentille de concentration, avec un pouvoir horizontal relativement fort, permettant de concentrer les rayons d'un même faisceau presque parallèlement les uns aux autres selon la direction de l'axe optique Ex du dispositif d'émission 2 correspondant (voir figure 6).The rays originate from the four light sources 1, are reflected on the walls 7, focus on interception surfaces at the location of secondary foci 9, then are directed to the exit surfaces 8 of the emission devices 2. As stated above, the exit surfaces 8 have a role of concentration lens, with a relatively strong horizontal power, for concentrating the rays of the same beam almost parallel to each other in the direction of the optical axis E x of the corresponding transmission device 2 (see figure 6 ).

Les quatre faisceaux sortant des quatre dispositifs d'émission 2 ne sont évidemment pas parallèles entre-eux.The four beams coming out of the four emission devices 2 are obviously not parallel to each other.

Ils atteignent ensuite la surface d'entrée 15 de la lentille de projection 14. Cette surface d'entrée 15 a un pouvoir horizontal faible et ne dévie donc que très légèrement les rayons. Les quatre faisceaux atteignent enfin la surface de sortie 16 de la lentille de projection 14 qui réoriente tous les rayons de tous les faisceaux parallèlement selon une même direction parallèle à la direction de l'axe optique général X du système d'éclairage (voir figure 6).They then reach the entrance surface 15 of the projection lens 14. This input surface 15 has a low horizontal power and therefore deviates only slightly the rays. The four beams finally reach the exit surface 16 of the projection lens 14 which reorients all the beams of all the beams parallel in a same direction parallel to the direction of the general optical axis X of the lighting system (see FIG. figure 6 ).

La figure 5 montre le chemin des rayons lumineux à travers le système d'éclairage selon la figure 3, dans un plan vertical.The figure 5 shows the path of the light rays through the lighting system according to the figure 3 , in a vertical plane.

Les rayons partent des quatre sources lumineuses 1, se réfléchissent sur les parois 7, se focalisent sur des surfaces d'interception au niveau du lieu de foyers secondaires 9, puis sont dirigés vers les surfaces de sortie 8 des dispositifs d'émission 2. Comme énoncé précédemment, les surfaces de sortie 8 consistent en des lentilles de concentration 8 qui n'ont qu'un faible pouvoir vertical et qui ne dévient que très légèrement les rayons. Les quatre faisceaux sortant des quatre dispositifs d'émission 2 sont donc composés de rayons divergents verticalement. Ils atteignent ensuite la surface d'entrée 15 de la lentille de projection 14. Cette surface d'entrée 15 réoriente tous les rayons de tous les faisceaux quasiment parallèlement selon une même direction parallèle à la direction de l'axe optique général X du système d'éclairage. Les quatre faisceaux atteignent enfin la surface de sortie 16 dont le pouvoir vertical est faible, mais suffisant pour faire en sorte que tous les rayons de tous les faisceaux soient orientés parfaitement parallèlement à l'axe optique général X.The rays originate from the four light sources 1, are reflected on the walls 7, focus on interception surfaces at the location of secondary foci 9, then are directed to the exit surfaces 8 of the emission devices 2. As stated above, the exit surfaces 8 consist of concentrating lenses 8 which have only a small vertical power and which deviate only slightly the rays. The four beams coming out of the four emission devices 2 are therefore composed of vertically diverging rays. They then reach the entrance surface 15 of the projection lens 14. This input surface 15 reorients all the radii of all the beams almost in parallel in the same direction parallel to the direction of the general optical axis X of the projection system. 'lighting. The four beams finally reach the exit surface 16 whose vertical power is low, but sufficient to ensure that all the beams of all the beams are oriented perfectly parallel to the general optical axis X.

A l'issue des différentes trajectoires prises par les rayons, aussi bien dans un plan horizontal que dans un plan vertical, des faisceaux 17 parallèles entre eux et dirigés vers l'infini selon une même direction sortent ainsi du système d'éclairage.At the end of the different trajectories taken by the rays, as well in a horizontal plane as in a vertical plane, beams 17 parallel to each other and directed towards infinity in the same direction thus leave the lighting system.

Comme cela est illustré en figure 4, tous les rayons des faisceaux arrivant sur la lentille de projection 14 sont issus d'une courbe focale 18 virtuelle située en amont des dispositifs d'émission 2. Les différents dispositifs d'émission 2 partagent ainsi une même ligne de foyer virtuel 18 pour créer le système optique général.As illustrated in figure 4 , all the rays of the beams arriving on the projection lens 14 come from a virtual focal curve 18 located upstream of the emission devices 2. The different transmission devices 2 thus share a same virtual focus line 18 to create the general optical system.

La figure 6 correspond à la figure 4 avec la schématisation des dimensions des dispositifs et des orientations des axes optiques, les références des pièces n'étant pas inscrites pour plus de lisibilité.The figure 6 corresponds to the figure 4 with the schematization of the dimensions of the devices and orientations of the optical axes, the references of the parts not being inscribed for more legibility.

L'axe optique général X du système d'éclairage est représenté sous les dispositifs d'éclairage 2 et la lentille de projection 14. Il représente la direction des faisceaux 17 en sortie du système d'éclairage, qui sont dirigés à l'infini. Les axes optiques E1 à E4 des dispositifs d'éclairage sont inclinés par rapport à l'axe optique général X, respectivement d'un angle β1 à β4. Cette inclinaison peut monter à 45° par exemple, en fonction de la largeur du faisceau souhaité en sortie du système d'éclairage.The general optical axis X of the lighting system is represented under the lighting devices 2 and the projection lens 14. It represents the direction of the beams 17 in output of the lighting system, which are directed to infinity. The optical axes E 1 to E 4 of the lighting devices are inclined with respect to the general optical axis X, respectively of an angle β 1 to β 4 . This inclination can rise to 45 ° for example, depending on the desired beam width at the output of the lighting system.

De la même manière, la lentille de projection 14 n'est pas disposé perpendiculairement à l'axe optique général X du système d'éclairage. En particulier, la surface de sortie 16 de la lentille de projection 14 est inclinée d'un angle α, par exemple de 14°, par rapport à la perpendiculaire à l'axe optique général X. Cet angle α dépend de l'orientation de la glace.In the same way, the projection lens 14 is not arranged perpendicularly to the general optical axis X of the lighting system. In particular, the exit surface 16 of the projection lens 14 is inclined at an angle α, for example 14 °, with respect to the perpendicular to the general optical axis X. This angle α depends on the orientation of ice.

En fonction de cet angle α, les pouvoirs verticaux et horizontaux des lentilles de concentration et de projection seront ajustés selon les lois classiques d'optique.As a function of this angle α, the vertical and horizontal powers of the concentration and projection lenses will be adjusted according to conventional optical laws.

L'épaisseur a de la lentille de projection 14 est variable entre 2mm et 40mm.The thickness a of the projection lens 14 is variable between 2mm and 40mm.

Sa longueur b est au moins aussi grande que l'addition totale des largeurs des quatre dispositifs d'émission 2 de manière à les recouvrir et à les cacher, comme illustré en figure 7 notamment. Cette longueur b est de préférence de l'ordre de 80mm.Its length b is at least as great as the total addition of the widths of the four emission devices 2 so as to cover and hide them, as illustrated in FIG. figure 7 especially. This length b is preferably of the order of 80 mm.

La longueur e des dispositifs d'émission est de préférence comprise entre 20mm et 70mm. La lentille de projection 14 peut être située par exemple à seulement 20mm des surfaces de sortie 8 des dispositif d'émission afin d'obtenir un système d'éclairage le plus compact possible.The length e of the emission devices is preferably between 20 mm and 70 mm. The projection lens 14 may be located, for example, only 20mm from the exit surfaces 8 of the transmission device in order to obtain the most compact lighting system possible.

De façon avantageuse, la forme de la surface de sortie de chaque dispositif d'émission 2 est adaptée à la forme de la surface d'entrée de la lentille de projection 14 pour limiter les aberrations optiques et améliorer les performances du système d'éclairage.Advantageously, the shape of the exit surface of each emission device 2 is adapted to the shape of the entrance surface of the projection lens 14 to limit optical aberrations and improve the performance of the lighting system.

La figure 7 est une vue de face du système d'éclairage, où l'on visualise la surface de sortie 16 de la lentille de projection 14 qui vient cacher les dispositifs d'émission 2.The figure 7 is a front view of the lighting system, which shows the exit surface 16 of the projection lens 14 which hides the emission devices 2.

L'inclinaison γ du système d'éclairage par rapport à l'horizontale peut être de 3° par exemple. Il s'agit donc d'une inclinaison mineure par rapport à l'horizontale, comme cela était annoncé au début de la description dans la définition du terme « horizontal ».The inclination γ of the lighting system relative to the horizontal may be 3 ° for example. It is therefore a minor inclination to the horizontal, as was announced at the beginning of the description in the definition of the term "horizontal".

La hauteur c du système d'éclairage est par exemple de 25mm, et la longueur totale d est de 130mm.The height c of the lighting system is for example 25mm, and the total length d is 130mm.

Les figures 8 et 9 montrent la lentille de projection 14 plus précisément. Dans cet exemple, la surface de sortie 16 est concave avec un rayon de 140mm de préférence.The Figures 8 and 9 show the projection lens 14 more precisely. In this example, the exit surface 16 is concave with a radius of preferably 140 mm.

Cependant, cette surface de sortie 16 est surtout une surface de style, qui peut prendre diverses autres formes. De manière générale, cette surface de sortie 16 est formée par un balayage de deux rayons, à savoir un rayon vertical 18 balayé sur un rayon horizontal 19.However, this exit surface 16 is mostly a style surface, which can take various other forms. In general, this exit surface 16 is formed by a scan of two rays, namely a vertical radius 18 scanned on a horizontal radius 19.

Les surfaces d'entrée 15 et de sortie 16 de la lentille de projection 14 sont fabriquées en polymère thermoplastique transparent, du type polycarbonate (PA) ou polyméthacrylate de méthyle (PMMA). Elles peuvent également être fabriquées en silicone ou dans d'autres matières transparentes, notamment en fonction de l'indice de réfraction souhaité.The inlet and outlet surfaces 16 of the projection lens 14 are made of transparent thermoplastic polymer, of the polycarbonate (PA) or polymethylmethacrylate (PMMA) type. They can also be made of silicone or other transparent materials, in particular depending on the desired refractive index.

Puisque la surface de sortie 16 constitue un paramètre d'entrée non modifiable étant donné que son objectif est de suivre le galbe de la glace, la surface d'entrée 15 quant à elle est une résultante optique pour garantir le principe optique de Fermat. Sa forme peut être convexe, concave ou encore de forme libre.Since the output surface 16 is a non-modifiable input parameter since its purpose is to follow the ice curve, the input surface 15 is an optical resultant to guarantee the Fermat optical principle. Its shape can be convex, concave or free form.

La surface d'entrée 15 peut être réalisée de plusieurs manières, en fonction du type de lentille de projection souhaité. Elle peut être d'allure concave, comme cela est visible en figure 10a, si une lentille à ligne de foyer 20 est souhaitée. Il s'agit du cas décrit dans la figure 4 avec la ligne de foyer virtuelle 18.The entrance surface 15 can be made in a number of ways, depending on the type of projection lens desired. It can be concave, as can be seen in figure 10a if a focus line lens 20 is desired. This is the case described in figure 4 with the virtual focus line 18.

Elle peut également être d'allure convexe, comme cela est visible en figure 10b, si une lentille à foyer 21 est souhaitée.It can also be convex, as can be seen in figure 10b if a focus lens 21 is desired.

Elle peut aussi être continue, comme cela est visible sur les figures 3 à 9, ou discontinue comme cela est visible sur les figures 11 et 12. Dans ce dernier cas, la surface d'entrée 15 est discrétisée avec quatre tronçons 25 26 27 28 reliés entre eux. Chaque tronçon est adapté au type de lumière placé en amont. Dans l'exemple en figure 11, le premier tronçon 25 et le quatrième tronçon sont adaptés à des types de lumière qui délivrent un éclairage plutôt concentré et intense. Les second 26 et troisième tronçons 27 sont adaptés à des types de lumière qui produiront un éclairage plutôt peu intense et étalé horizontalement. Ces quatre types de lumière fonctionnent simultanément afin de créer un feu de croisement. Contrairement aux feux de route décrits précédemment, les lignes de foyer secondaire de ces quatre lumières ne sont pas alignées.It can also be continuous, as can be seen on Figures 3 to 9 , or discontinuous as is visible on the Figures 11 and 12 . In the latter case, the input surface 15 is discretized with four sections 25 26 27 28 interconnected. Each section is adapted to the type of light placed upstream. In the example in figure 11 , the first section 25 and the fourth section are adapted to types of light that deliver a rather concentrated and intense lighting. The second 26 and third sections 27 are adapted to light types that will produce a rather low intensity lighting and spread horizontally. These four types of light work simultaneously to create a low beam. Unlike the high beams described above, the secondary focus lines of these four lights are not aligned.

La dernière figure 12 montre un exemple d'intégration d'un tel système d'éclairage dans un module d'éclairage classique avec un radiateur 24 et une carte électronique 23 alimentant les différentes LED. Un boîtier de protection 22 solidaire de la glace entoure au moins partiellement le système d'éclairage.The last figure 12 shows an example of integration of such a lighting system in a conventional lighting module with a radiator 24 and an electronic card 23 supplying the various LEDs. A protective housing 22 integral with the ice at least partially surrounds the lighting system.

En ce qui concerne la description ci-dessus, les relations dimensionnelles optimales pour les parties de l'invention, en incluant les variations de taille, de matériaux, de formes, de fonction, sont considérées comme apparentes et évidentes pour l'homme du métier, et toutes les relations équivalentes à ce qui est illustré dans les dessins et ce qui est décrit dans le mémoire sont censées être incluses dans la présente invention.With regard to the above description, the optimal dimensional relationships for the parts of the invention, including variations in size, materials, shapes, function, are considered apparent and obvious to those skilled in the art , and all relationships equivalent to what is illustrated in the drawings and what is described in the specification are intended to be included in the present invention.

Claims (11)

Système d'éclairage pour véhicule automobile comprenant au moins un dispositif optique primaire d'émission 2 d'un faisceau lumineux présentant un profil de coupure, le dispositif optique primaire d'émission 2 comportant au moins une source lumineuse 1 et un organe optique primaire 2 monobloc comprenant une surface d'entrée 6 apte à recevoir un faisceau lumineux émis par la source lumineuse 1, une surface d'interception de rayons configurée pour former le profil de coupure dans le faisceau lumineux reçu et une surface de sortie 8 dudit faisceau lumineux,
caractérisé en ce qu'il comprend également un dispositif de projection 14 disposé en aval du (des) dispositif(s) optique(s) primaire(s) d'émission 2 et comprenant : - une surface d'entrée 15 disposée en vis-à-vis du (des) dispositif(s) optique(s) primaire(s) d'émission 2, et par laquelle sont introduits des rayons du faisceau lumineux issus en sortie du (des) dispositif(s) optique(s) primaire(s) d'émission 2 ; - une unique surface de sortie 16 continue par laquelle est projeté le faisceau lumineux 17. Lighting system for a motor vehicle comprising at least one primary optical device 2 for emitting a light beam having a cut-off profile, the primary optical emission device 2 comprising at least one light source 1 and a primary optical element 2 monoblock comprising an input surface 6 adapted to receive a light beam emitted by the light source 1, a ray intercepting surface configured to form the cutoff profile in the received light beam and an output surface 8 of said light beam,
characterized in that it also comprises a projection device 14 disposed downstream of the optical transmission device (s) 2 and comprising: an input surface disposed opposite the primary optical transmission device (s) 2, and through which light beam rays coming out of the light source are introduced (FIG. optical device (s) primary (s) emission (s) 2; a single continuous exit surface 16 through which the light beam 17 is projected. Système d'éclairage selon l'une des revendications précédentes, caractérisé en ce que ledit dispositif de projection 14 consiste en une lentille de projection 14.Lighting system according to one of the preceding claims, characterized in that said projection device 14 consists of a projection lens 14. Système d'éclairage selon l'une des revendications précédentes, caractérisé en ce que l'organe optique primaire 2 comporte une portion d'entrée 3 comprenant la face d'entrée 6 et agencée pour former une image primaire de la source lumineuse au niveau de la surface d'interception.Lighting system according to one of the preceding claims, characterized in that the primary optical element 2 comprises an input portion 3 comprising the input face 6 and arranged to form a primary image of the light source at the level of the interception surface. Système d'éclairage selon la revendication précédente, caractérisé en ce que l'organe optique primaire 2 comprend une portion de sortie 5 comprenant la face de sortie 8 et agencée pour former une image secondaire de l'image primaire, le dispositif de projection 14 étant agencé pour projeter ladite image secondaire.Lighting system according to the preceding claim, characterized in that the primary optical element 2 comprises an output portion 5 comprising the output face 8 and arranged to form a secondary image of the primary image, the projection device 14 being arranged to project said secondary image. Système d'éclairage selon l'une des revendications 2 à 4, caractérisé en ce que, à partir de la surface de sortie 16 de la lentille de projection 14, tous les rayons lumineux en provenance du (des) dispositif(s) optique(s) primaire(s) d'émission 2 sont orientés parallèlement les uns aux autres dans une unique direction parallèle à l'axe optique X du système.Lighting system according to one of Claims 2 to 4, characterized in that , from the exit surface 16 of the projection lens 14, all the light rays coming from the optical device (s) ( s) primary (s) emission 2 are oriented parallel to each other in a single direction parallel to the optical axis X of the system. Système d'éclairage selon l'une des revendications 2 à 5, caractérisé en ce que la surface d'entrée 15 de la lentille de projection 14 est continue.Lighting system according to one of claims 2 to 5, characterized in that the input surface 15 of the projection lens 14 is continuous. Système d'éclairage selon l'une des revendications précédentes, caractérisé en ce qu'il comprend au moins deux dispositifs optiques primaires d'émission 4 comportant chacun une source lumineuse 1 et un organe optique primaire 2.Lighting system according to one of the preceding claims, characterized in that it comprises at least two primary optical emission devices 4 each comprising a light source 1 and a primary optical element 2. Système d'éclairage selon la revendication précédente, caractérisé en ce que les dispositifs optiques primaires d'émission 2 sont disposés sur un même plan horizontal et partagent une même ligne de focalisation 9 des rayons lumineux au niveau des surfaces d'interceptions des rayons configurée pour former le profil de coupure.Lighting system according to the preceding claim, characterized in that the primary optical transmission devices 2 are arranged on the same horizontal plane and share a same line of focus 9 of the light rays at the interception surfaces of the rays configured to form the cutoff profile. Système d'éclairage selon l'une des revendications 2 à 5, caractérisé en ce que la surface d'entrée 15 de la lentille de projection 14 est discontinue et se divise en plusieurs portions 25 26 27 28 reliées les unes aux autres, chaque portion étant adaptée à et située en aval d'un dispositif optique primaire d'émission 2.Lighting system according to one of Claims 2 to 5, characterized in that the entrance surface 15 of the projection lens 14 is discontinuous and divides into a plurality of portions 26 26 28 connected to each other, each portion being adapted to and situated downstream from a primary optical emission device 2. Système d'éclairage selon l'une des revendications précédentes, caractérisé en ce que les dispositifs optiques primaires d'émission 2 et le dispositif de projection 14 sont formés dans un ensemble monobloc.Lighting system according to one of the preceding claims, characterized in that the primary optical emission devices 2 and the projection device 14 are formed in a one-piece assembly. Véhicule équipé d'au moins un système d'éclairage tel que décrit dans les revendications précédentes.Vehicle equipped with at least one lighting system as described in the preceding claims.
EP16181306.8A 2015-07-28 2016-07-26 Lighting system for motor vehicle headlight Active EP3124854B1 (en)

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PL3124854T3 (en) 2019-08-30
CN106439667B (en) 2021-11-02
CN113883465A (en) 2022-01-04
US11892133B2 (en) 2024-02-06
EP3415810A1 (en) 2018-12-19
CN106439667A (en) 2017-02-22
US10151437B2 (en) 2018-12-11
KR20240024155A (en) 2024-02-23
US20220049829A1 (en) 2022-02-17
EP3124854B1 (en) 2018-10-17
KR20170013838A (en) 2017-02-07
US20190093846A1 (en) 2019-03-28
US11156333B2 (en) 2021-10-26
FR3039630A1 (en) 2017-02-03
US20170030543A1 (en) 2017-02-02
ES2702050T3 (en) 2019-02-27

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