EP3232118B1 - Module d'émission d'un faisceau lumineux pour projecteur de véhicule automobile - Google Patents

Module d'émission d'un faisceau lumineux pour projecteur de véhicule automobile Download PDF

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Publication number
EP3232118B1
EP3232118B1 EP17165098.9A EP17165098A EP3232118B1 EP 3232118 B1 EP3232118 B1 EP 3232118B1 EP 17165098 A EP17165098 A EP 17165098A EP 3232118 B1 EP3232118 B1 EP 3232118B1
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EP
European Patent Office
Prior art keywords
collector
collectors
focal region
light
module
Prior art date
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Active
Application number
EP17165098.9A
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German (de)
English (en)
French (fr)
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EP3232118A1 (fr
Inventor
Simon Gousset-Rousseau
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
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Valeo Vision SAS
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Publication of EP3232118A1 publication Critical patent/EP3232118A1/fr
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Classifications

    • 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
    • F21S41/10—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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled 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
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • 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
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
    • 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
    • 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

Definitions

  • the present invention relates to a device for emitting a light beam.
  • a preferred application relates to the automotive industry for the production of lighting devices, in particular motor vehicle headlamps.
  • lighting modules are known, among which there are traditionally dipped headlights, or dipped headlights, with a range on the road of around 70 meters, which are used essentially at night and whose configuration of the light beam is such that it makes it possible not to dazzle the driver of a vehicle crossed or followed.
  • this beam has a cut in the upper part with a horizontal portion, preferably approximately 0.57 degrees below the horizon, so as not to illuminate the area in which the driver of an oncoming vehicle should be located. .
  • the publications FR2934667 And FR2860280 fall within the scope of this technology by forming a lighting module which produces a cut-off beam by means of a bender arranged along the optical axis between first and second optical collectors suitable for collecting light emitted by first and second light sources respectively and redirecting the light to a focal region where one of the ends of the bender is located. Downstream of the bender, the rays are projected via a projection lens located at the output of the lighting module.
  • This prior art has a relatively complex structure, in particular due to a large number of parts to be assembled to form the projector. Furthermore, the bender placed between the two collectors has the effect of generating a dark line in the light beam, when the first and second light sources are switched on for “full headlights” lighting (main beam).
  • the invention makes it possible to solve all or part of the drawbacks of current techniques and proposes, to this end, to implement the cut-off function by exploiting the phenomenon of reflection, preferably total, on one of the collectors, so as to get rid of the folder.
  • the term "collector adapted to reflect a light ray by total reflection” means a collector made of a material with a refractive index such as a light ray, arriving on a wall of the collector with an angle d incidence greater than a predetermined value, is totally reflected on this wall, without a part of the energy of this ray being substantially transmitted through this wall.
  • the invention relates, in this sense, to a transmission module according to claim 1.
  • one of said at least one first and/or at least one second collector is advantageously used as an optical reflector to generate a beam with a cut-off profile, without requiring any additional component, such as a plate metallic fixed between said first and second collectors.
  • Said collector acting as a cut-off element makes it possible to reflect all or part of the rays coming from the other collector(s), towards an upper/lower end of the lens, possibly provided for projecting the beam.
  • the reflection can be achieved either by vitreous reflection on a dioptric surface defined between the collector and the ambient medium, or by metallic reflection on a metallic coating deposited on part of the surface of the collector.
  • the outer surface of one collector with respect to the other plays the role of optical reflector.
  • Another aspect of the invention relates to a transmission device comprising at least one transmission module according to one or more of the characteristics described above.
  • the device is a motor vehicle front headlight.
  • FIG. 1 is a sectional representation of a lighting module 1 for a motor vehicle, according to one embodiment of the invention.
  • the cut is made along a vertical plane [O, X, Z] of a local coordinate system ⁇ O, X, Y, Z ⁇ , where the OX axis indicates a horizontal direction, parallel to the optical axis of the projector, while the OZ axis designates a vertical direction perpendicular to the OX axis.
  • the light module shown in figure 1 is intended to produce two light beams for the implementation of two distinct lighting modes: (i) lighting having a cut-off profile to avoid dazzling vehicles traveling in the opposite direction (corresponding to a lighting mode of type “codes”), and (ii) lighting without cut-off profile (corresponding to a lighting mode of the “full headlights” or “main beam” type).
  • the lighting module (or emission module) according to the invention 1 comprises a first assembly consisting of a first light source 3 and a first optical collector 5, the first optical assembly being intended to provide a first light beam .
  • the module 1 further comprises a second assembly consisting of a second light source 4 and a second optical collector 6, the second optical assembly being intended to provide a second light beam.
  • a converging lens 10 is arranged along the optical axis A, so as to project the optical beams coming from the collectors and to produce one of the two lighting modes provided depending on the switching on of one or more two light sources 3, 4.
  • the first collector 5 extends in the direction of a focal region to reflect part of the light emitted by the other collector, so as to define the cut-off profile.
  • the focal region corresponds to focus F of lens 10.
  • the first collector 5 comprises a surface 55 for reflecting the light coming from the second collector 6. More precisely, the cut-off profile of the beam is produced by a surface element 55 of the first collector 5 at the level of the focus F, this surface element forming an interface between the first manifold 5 and the ambient medium consisting of air.
  • the cutoff is implemented by an external partial reflection of the vitreous reflection type.
  • a the beam can be cut off advantageously without requiring any additional component, such as a so -called folding metal plate.
  • the cuts produced can have any orientation in space.
  • the cut-off profile preferably means the formation of an output beam, not uniformly distributed around the optical axis, due to the presence of a zone of less light exposure, this zone being substantially delimited by a profile cutoff, which can be formed by at least two, and in particular three straight line segments forming an angle between them to form a bend, known by the English term "kink".
  • the resulting lighting is said to be of the "low beam" type.
  • each light source 3, 4 consists of a light-emitting diode.
  • several emission elements may be combined to form each of the first and second light sources, so as to emit a luminous flux of higher optical power at the output of the projection lens.
  • Each emission element may consist, for example, of a light-emitting diode or a laser diode.
  • the first 3 and second 4 light sources are oriented so as to emit light in directions parallel to the optical axis A of the module.
  • the first 5 and second 6 collectors are adapted to collect the light emitted by the first 3 and second 4 light sources respectively and to redirect the light collected towards the focal region and in particular towards the focal point F.
  • the first collector 5 extending in the direction of the focal region comprises a collection region 51 having an axis of symmetry inclined in the direction of the optical axis A of the module.
  • the first and second collectors are separated by a medium with a refractive index lower than the index refraction of collectors.
  • this medium consists of air.
  • a dioptric surface 55 is thus formed between the air and the first collector 5. In this way, all or part of the rays coming from the second collector 6 are reflected on the surface of the first collector 5, for example, according to a glassy reflection.
  • the first collector 5 extending in the direction of the focal region has an exit face 53 comprised in the focal region and more particularly in a vertical plane (F, O, Y) comprising the point focal F.
  • the dioptric surface 55 of the first collector 5 is tangent to the optical axis A of the module.
  • the first and second collectors are made of a transparent material having a refractive index greater than the refractive index of air.
  • Polycarbonate (PC) suitable for resisting the heat generated by the diodes (LED) will preferably be used.
  • PC Polycarbonate
  • LED diodes
  • the choice of this material is particularly advantageous, insofar as the LED diodes are close to the transparent collectors.
  • the collectors may be made of polypropylene carbonate (PPC) or polymethyl methacrylate (PMMA).
  • FIG 2 shows in section, along a vertical plane (O, X, Z) passing through the optical axis A, a second embodiment of the invention.
  • This second embodiment differs from the first embodiment described with reference to the figure 1 , in that the second collector 6' extends along the optical axis A in the direction of the focal region.
  • the second collector 6' extending in the direction of the focal region, comprises a collection region 61 having an axis of symmetry inclined in the direction of the optical axis A of the module.
  • a dioptric surface 65 is formed between the ambient medium consisting of air and the second collector 6', allowing all or part of the rays coming from the first collector 5' to be reflected on the surface of the second collector 6' by an external partial reflection of the vitreous reflection type.
  • the cutoff profile of the beam is produced by an element of the diopter surface 65 at the level of the focal point F, as previously described with reference to the figure 1 .
  • the module is adapted so that part of the light coming from the first light source 3 associated with the first collector 5' is transmitted by said first collector 5' and passes through the second collector 6' , so as to come out through the exit face 63 comprised in the focal region.
  • the second collector 6' is adapted to guide the light injected from the first collector 5', as far as the exit surface 63 of the second collector 6', so as to reach the projection lens 10.
  • the lower surface 67 of the second collector 6' is shaped in such a way that the light coming from the first collector 5' undergoes total reflection on this surface. The light thus emitted can be used to illuminate road signs located above the roadway, in height.
  • the lower surface 67 of the second collector 6' is shaped to illuminate the road signs, whether in partial or total reflection, or by metallizing this surface.
  • FIG. 3 shows in section, along a vertical plane (O, Y, Z) passing through the optical axis A, a variant embodiment applied to the first embodiment of the invention described above with reference to the figure 1 .
  • the first collector 5" extending towards the focal region, comprises a reflective coating 8 arranged on a part of the collector 5" in particular at the level of the focal region, so as to reflect all or part of the rays coming of the other collector 6 according to a cut-off profile.
  • this reflective coating 8 consists of a thin layer of metal, the layer being thin enough to avoid the appearance of a zone of absence of light, at the output of the projection lens 10.
  • This metal coating also makes it possible to improve the emission efficiency of the part of the module which does not extend to the focal region (ie second source 4 and second collector 6 in the example of the picture 3 ), due to a high reflectivity of the metal in comparison with the case of glassy reflection.
  • such a coating can be easily shaped according to the desired cut-off profile. It thus constitutes a cut-off element integrated into the first 5" collector of the module.
  • the metallic coating 8 partly covers the surface 55 of the first collector 5 tangent to the optical axis A, so that all or part of the rays coming from the second collector 6 are reflected on the metallic coating 8 (reflection external metallic reflection type), so as to be redirected towards a lower end of the lens 10.
  • FIG 4 shows in section, along a vertical plane (O, Y, Z) passing through the optical axis A, the same embodiment variant applied to the second embodiment of the invention described above with reference to the figure 2 .
  • the metallic coating 8' partly covers the surface 65 of the second collector 6" tangent to the optical axis A, so that all or part of the rays coming from the first collector 5' are reflected on the layer metal 8', so as to be redirected towards an upper end of the lens 10.
  • the beam is cut off by means of a metallic reflection of the rays coming from the first collector 5' implemented by the metallic coating 8'.
  • FIG. 5 shows in section, along a vertical plane (O, Y, Z) passing through the optical axis A, a third embodiment of the invention, in which the first 5 and second 6 'collectors extend in the direction of the focal region and in particular towards the focal point F of the lens 10.
  • the two collectors 5, 6' each have an output face 53, 63 included in the focal region, and in particular in a vertical plane (F, Y, Z) comprising the focal point F of lens 10.
  • the lower surface 55 of the first collector 5 and the upper surface 65 of the second collector 6' coincide along the optical axis A, so that the two collectors are in contact with each other to form a dioptric surface.
  • the cutoff is achieved by total reflection at the level of the dioptric surface.
  • This embodiment in which the first and second collectors are both extended up to the focal point F of the lens 10, advantageously makes it possible to maximize the optical flows originating from the first 5 and second 6′ collectors respectively, given that each of these flows undergo a total reflection at the level of the dioptric surface.
  • the two collectors are separated by a thin slice of air arranged along the optical axis A, so that each collector defines a diopter surface with air.
  • Each dioptric surface thus formed by a collector makes it possible to reflect all or part of the light emitted by the other collector. Thus, all or part of the rays coming from the two collectors are reflected towards the upper and lower ends of the lens 10.
  • the exit face of the collector(s) extending in the direction of the focal region has a flat surface perpendicular to the optical axis A. This is the exit face 53 of the first collector 5 , 5" as shown on the figure 1 , 3 , 5 and the outlet face 63 of the second collector 6', 6" as illustrated on the figure 2 , 4 , 5 .
  • this exit face may have a curved or hollow surface and/or may be inclined with respect to the optical axis, in order to widen or concentrate the optical beam and/or to correct any aberrations of the projection lens 10.
  • the edge formed by the intersection of the output surface of the transparent collector having been extended in the direction of the optical axis and the lower surface of this collector, forming the cut-off element, can be shaped so as to reduce the the effect of the aberrations of the projection lens 10 on the shape of the cut in the beam.
  • This is the edge of the first collector 5.5" between its outlet surface 53 and its lower surface 55 as illustrated in the figure 1 , 3 or the edge of the second manifold 6', 6" between its exit surface 63 and its lower surface 65 as illustrated in the figure 2 , 4 .
  • FIG 6 shows in perspective, a multi-source module according to the invention comprising several transmission modules according to the second embodiment previously described with reference to the figure 2 .
  • the module is said to be “multi-source” in the sense that it comprises several light sources to have sufficient optical power, in accordance with the lighting standards in force.
  • the module comprises a first row of seven light-emitting diodes 3a, 3b, 3c, 3d, 3e, 3f, 3g (first sources) and a second row of five light-emitting diodes 4c, 4d, 4e, 4f, 4g (second sources ). Seven first collectors and five second collectors are respectively associated with the seven first and five second light sources.
  • the second collectors are in continuity of material with each other, so as to form a single part 600, this part being able to be easily produced by molding or by any other suitable manufacturing technique.
  • the first collectors are in continuity of material with each other, so as to form a single piece.
  • the module further comprises a projection lens 100 common to all the sources and collectors.
EP17165098.9A 2016-04-11 2017-04-05 Module d'émission d'un faisceau lumineux pour projecteur de véhicule automobile Active EP3232118B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1653166A FR3050011A1 (fr) 2016-04-11 2016-04-11 Module d'emission d'un faisceau lumineux pour projecteur de vehicule automobile

Publications (2)

Publication Number Publication Date
EP3232118A1 EP3232118A1 (fr) 2017-10-18
EP3232118B1 true EP3232118B1 (fr) 2023-03-08

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EP17165098.9A Active EP3232118B1 (fr) 2016-04-11 2017-04-05 Module d'émission d'un faisceau lumineux pour projecteur de véhicule automobile

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US (2) US10663134B2 (zh)
EP (1) EP3232118B1 (zh)
JP (1) JP6948818B2 (zh)
CN (1) CN107289395B (zh)
FR (1) FR3050011A1 (zh)

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JP6948818B2 (ja) 2021-10-13
US20170292671A1 (en) 2017-10-12
FR3050011A1 (fr) 2017-10-13
JP2017199660A (ja) 2017-11-02
US20200263848A1 (en) 2020-08-20
EP3232118A1 (fr) 2017-10-18
US10663134B2 (en) 2020-05-26
CN107289395A (zh) 2017-10-24
US11085603B2 (en) 2021-08-10

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