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
  • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
  • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
  • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving 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
  • F21S41/20—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 - F21S41/2805
• • 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
  • F21S41/20—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
  • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
  • F21S41/32—Optical layout thereof
  • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
• • 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
  • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
  • F21S41/32—Optical layout thereof
  • F21S41/36—Combinations of two or more separate 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
  • F21S41/36—Combinations of two or more separate reflectors
  • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
  • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
  • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
  • F21S43/14—Light emitting diodes [LED]
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
  • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
  • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
  • F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
• • 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
  • F21W2102/10—Arrangement or contour of the emitted light
  • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
• • 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
  • F21W2102/30—Fog lights
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
  • F21Y2115/00—Light-generating elements of semiconductor light sources
  • F21Y2115/10—Light-emitting diodes [LED]

Definitions

• Luminous module for a motor vehicle and lighting and / or signaling device equipped with such a module
• the present invention relates in particular to a light module for a motor vehicle, and to a lighting and / or signaling device provided with such a module.
• a preferred application relates to the automotive industry, for the equipment of vehicles, in particular for the production of devices capable of emitting light beams, also called lighting and / or signaling functions, generally meeting regulations.
• the invention may allow the production of a beam of light, preferably highly resolved, pixelated type, especially for signaling and / or participation in lighting functions in the front of a vehicle. It can be used to display pictograms or variable patterns at a projection surface of the outgoing light.
• Signaling and / or lighting lamps for motor vehicles are light devices that include one or more light sources and an ice that closes the fire.
• the light source emits light rays to form a light beam that is directed towards the ice to produce an illuminating surface that transmits light to the outside of the vehicle.
• These functions must comply with regulations regarding light intensity and visibility angles in particular.
• the known lighting and signaling modules are heretofore provided for transmitting, for example:
• a lighting beam for foggy weather characterized by a flat cut and a large width of illumination
• FIG. 1 gives an example of implantation of a pixelized and digital imaging system in the form of a micro mirror array 13 in a projection module of a beam.
• a light source 1 1 generates light rays in the direction of an optical device 12 for generating a beam that will impact a reflection face 14 of a matrix with micro-mirrors 13. According to the inclination of the mirrors, controlled, the light is either returned to the projection device 15, or returned to a dead zone so as not to participate in active illumination.
• the patent document WO 2017 / Discloses a motor vehicle headlamp having a micro-mirror array and having a pair of light-emitting diode light sources each associated with a focusing lens of a light beam on the reflecting surface of the micro-mirror array.
• This duplication of sources obviously increases the luminous flux coming out of the projector.
• it inevitably increases the cost and bulk.
• the present invention relates to a light module for a motor vehicle configured to produce an output beam, comprising a light source comprising at least one light-emitting diode, a pixelated and digital imaging system, and an input optical device. interposed, according to the path of the light rays from the light source between the light source and the pixelated and digital imaging system so as to transmit at least a portion, said transmitted portion, light rays from the light source to a surface impact device of the pixelated and digital imaging system, characterized in that it comprises a prism, comprising a first face, a second face and a third face, and configured to:
• the light rays are deflected during their journey from the light source to the projection device at least partly through the prism.
• the function of the prism comprises, upstream of the imaging system, a transmission of light rays from the source and, downstream of the imaging system, a total internal reflection allowing to make an angular modification of the rays, advantageously strong , so as to return the rays exiting the prism in the direction of the projection device.
• the prism allows strong angular beam direction variations between the beam upstream of the imaging system and the beam downstream of the imaging system.
• the present invention also relates to a lighting and / or signaling device of a motor vehicle equipped with at least one light module.
• This device may comprise at least one additional module comprising at least one of an additional module configured to produce a base beam of passing beam and an additional module configured to produce a base beam of high beam.
• the pixelated beam can be an effective complement to another beam, or several.
• the device comprises an additional module configured to produce a dipped-beam base beam and an additional module configured to produce a main beam beam and in which the pixelated output beam of the module overlaps. partly at the same time the base beam of road light and / or the base beam of passing light.
• the pixelated beam can thus be used both to perform a function of writing on the ground in the portion on horseback with the passing beam and to contribute to anti-glare high beam functions in the English language (Glare Free High Beam). ) or dynamic cornering light for the horseback portion with the high beam.
• the present invention also relates to a vehicle equipped with at least one module and / or a device according to the present invention.
• the module is such that the second face and the third face are carried by two planes perpendicular to each other.
• it preferably comprises an optical projection device of the output beam receiving at least partially the at least a portion of the reflected rays.
• the optical projection device has an optical axis perpendicular to the second face.
• the projection optical device has an optical axis forming an obtuse angle with an average direction of the transmitted portion. This possibility is very useful for limiting the size and gives a great freedom of lens size for the optical input device.
• the third face is parallel to the impact surface.
• the third face comprises an antireflection coating. This avoids ghosting phenomena that can produce strong reflections back mirrors on the third side.
• the prism is made of a material whose Abbe number is greater than or equal to 50. Good conditions of total internal reflection are guaranteed over the entire visible light domain.
• the prism is made of PMMA or Crown glass. These materials are particularly economical.
• a window is disposed between the impact surface and the third face.
• a first face of the window is located opposite the impact surface and comprises an antireflection coating. This avoids ghosting phenomena that can produce strong reflections back mirrors on the glass.
• the antireflection coating is configured to reflect less than 4%, preferably less than 2% of the light rays in the visible range.
• the average direction of the transmitted portion forms, with a normal to the third face, an angle of between -20 ° and + 20 °.
• the distance separating the impact surface and the third face is less than or equal to 2 mm, and preferably less than or equal to 1 mm.
• the pixelated and digital imaging system comprises a matrix of micro-mirrors.
• the output beam is configured to project at least one pictogram pattern.
• the module is configured to project a light beam at the front of a motor vehicle.
• FIG. 1 shows a diagram of a projection of a pixelated beam according to the state of the art
• FIG. 2 represents an exemplary embodiment of the invention. Unless specifically indicated otherwise, technical features described in detail for a given embodiment may be combined with technical features described in the context of other embodiments described by way of example and not limitation.
• the terms relating to verticality, horizontality and transversality, or their equivalents refer to the position in which the lighting module is intended to be mounted in a vehicle.
• the terms “vertical” and “horizontal” are used in the present description to designate directions, in an orientation perpendicular to the horizon plane for the term “vertical”, and in an orientation parallel to the horizon plane 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.
• the device of the invention incorporates at least one module for generating a pixelized beam type, but preferably also provides the projection of at least one other beam, through at least one other module.
• the device of the invention can therefore be complex and associate several modules that can further optionally share components.
• the term "passing beam” means a beam used during the presence of crossed and / or tracked vehicles and / or other elements (individuals, obstacles, etc.) on or near the roadway. .
• This beam has a mean downward direction. It may be optionally characterized by a lack of light above a 1% downward incline on the traffic side in the other direction, and another inclined plane of 15 degrees with respect to the previous one. side of the traffic in the same direction, these two plans defining a break in accordance with European regulations. This upper descending cut is intended to avoid dazzling other users present in the road scene extending in front of the vehicle or on the sides of the road.
• the passing beam formerly derived from a single projector, has evolved, the crossing function can be coupled with other lighting characteristics that are still considered as dipped beam functions within the meaning of the present invention.
• BL Bit in English for cornering lighting
• DBL Dynamic Bending Light in English for mobile lighting of turn
• FBL Fiberd Bending Light in English for fixed lighting of bends
• the basic road beam has the function of illuminating a wide area of the scene facing the vehicle, but also a substantial distance, typically about 200 meters.
• This light beam by virtue of its lighting function, is located mainly above the horizon line. It may have a slightly ascending optical axis of illumination for example.
• the device can also be used to form other lighting functions via or outside of those previously described.
• one aspect of the invention relates to a module for generating an output beam of the pixelated type, that is to say processed by a pixelated and digital imaging system offering great flexibility, by the control of the imaging system, in terms of beam configurations actually planned.
• pixelated and digital imaging system "pixilated ray imaging system” or their equivalents are defined as a system emitting a light beam, said light beam being formed of a plurality of sub-light beams each light sub-beam can be controlled independently of the other sub-light beams.
• These systems can be, for example, micro-mirror matrices 23 as shown, liquid crystal devices, digital light processing (DLP) technology in Anglo-Saxon terms.
• Micro-mirror matrices are also called, in English terms, "Digital Micromirror Device” (DMD).
• Each independently controllable sub-beam forms a pixelated ray.
• the control of the matrices of micro-mirrors is performed by a control electronics.
• Each micro-mirror preferably has two operating positions. A so-called active position corresponds to an orientation of the micromirrors allowing reflection towards an output diopter of an incident light beam.
• a so-called passive position corresponds to an orientation of the micromirrors allowing reflection towards an absorbing surface of an incident light beam, that is to say towards a direction different from that of the exit diopter.
• this type of imaging system is implemented in mechanical microelectronic systems known by the term MEMS, which also includes in the present application so-called nano systems MS.
• a light source 21 is used to illuminate an impact surface 24 of the pixelated imaging system, for example the reflecting surface of the micro-mirrors of a matrix of micro-mirrors 23, and the treated rays. by the pixelated imaging system are returned for projection, typically via an output optical element such as a projector lens or a projection lens.
• the present invention can use light sources of the type LEDs still commonly called LEDs. It can possibly be organic LED (s). In particular, these LEDs may be provided with at least one chip capable of emitting a light intensity advantageously adjustable depending on the lighting function and / or signaling to achieve.
• the term light source means here a set of at least one elementary source such as an LED capable of producing a flow leading to generating at the output of the module of the invention at least one light beam.
• the output face of the source is of rectangular section, which is typical for LED chips.
• the light source 21 is configured to produce a luminous flux greater than 3000 Im and for example of the order of 4000 Im.
• Figure 2 shows an exemplary embodiment of the present invention which allows relative placement of the light source and improved input optical device relative to the state of the art.
• a light source 21 which may be of the type previously indicated.
• the light source 21 is configured to emit in a half space from an emissive zone of rectangular shape. At least a portion of the rays emitted by the source 21 are optically treated by an optical device 22.
• the latter may comprise one or more lenses of more or less complex shape.
• the optical device 22 takes the form of a lens having an input face 22a making it possible to admit the light rays coming from the source 21 and an output face 22b projecting towards the rest of the module .
• the light rays first enter through a prism 26, via a first face 26a of the latter.
• the angle formed between the first face 26a and the third face 26c is between 40 and 50 °, preferably between 44 and 46 °, more preferably it is 45 °, within manufacturing tolerances. This avoids generating field curvature aberrations in the rays reflected by the impact surface 24 to the inner side of the first face 26a and thus reduces the cost of the projection system because it will not require a correction element of these aberrations.
• the first face 26a forms an acute angle with the mean direction of the part transmitted "a" light rays from the source 21. More preferably, the average direction and the normal to the first face 26a forms an angle of between -20 ° and + 20 °. This promotes the amount of flow retransmitted. 0 .
• the third face 26c forms an acute angle with the mean direction of the transmitted portion "a" of the light rays coming from the source 21. More preferably, the average direction and the normal to the third face 26c forms an angle of between -20 ° and + 20 °. This greatly reduces the generation of parasitic rays during reflection on the impact surface 24 and promotes the emission of a pixelated beam with high contrast, which is desirable for an anti-glare function.
• the prism 26 a transparent material and advantageously having a high Abbe number, preferably greater than or equal to 50. It may be Crown glass or polymethylmethacrylate. methyl (PMMA).
• a prism material with an Abbe number greater than or equal to 50 will be preferred.
• an angle between the first face 26a and the third face 26c ideally 45 ° and an illumination of the prism by the source 21 such that the average direction and the normal to the third face 26c forms an angle of between -20 ° and + 20 ° , ideally confused with the normal.
• the light rays entering the prism 26, referenced “a" in FIG. 2, are directed towards a third face 26c of the prism 26 in front of which is located the imaging system, which is in the example shown a micro matrix 23.
• the impact surface 24 (corresponding to the exposed surface of the micromirrors) is parallel to the third face 26c, the latter preferably being flat.
• the impact surface 24 is protected by a window 27 whose first face 27a is located facing the impact surface 24.
• a second face 27b of the window 27 is located opposite, and in contact or not, of the third face 26c.
• the distance between the impact surface 24 and the third face 26c is limited and may for example be less than 2 mm or even 1 mm, and preferably 0.5 mm.
• the presence of the window 27 can be used to adjust this spacing without risk of damaging the impact surface 24.
• it also seeks to eliminate, or at least to limit, the parasitic effects that could produce a reflection on the third face 26c of the prism 26 or the first face 27a of the window of the rays having reached the impact surface 24 and having been reflected.
• an antireflection coating 28 which may be of current design and in particular be configured to produce a maximum reflection of 4% or up to 2% in the visible spectrum.
• the antireflection is chosen with a maximum reflection of 1% in the visible spectrum. In the context of use with a need for a high contrast, a maximum reflection of 0.2%, more preferably 0.1% in the visible spectrum will be preferred.
• the impact surface 24 defined by the set of micro-mirrors is of rectangular shape. It extends preferably in a plane perpendicular to a plane carrying the second face 26b of the prism 26 and / or parallel to the optical axis of the projection device 25.
• the rays are reflected, either to participate in the projected beam, or so as to be inactive. This is how the configuration of the pixelated beam can be controlled at will.
• the active rays "c" are directed so as to enter the prism 26 again by the third face 26c. This ray path is configured for active rays "c" to reach the first face 26a again.
• the angle of the rays relative to the first face 26a is such that it produces a total reflection internal to the prism 26 so as to form reflected rays "d" which are directed towards the second face 26b of the prism 26.
• the outgoing rays "e” are directed to a projection device 25, which is or which typically includes a projection lens. In the illustrated case, it is a convex plane lens whose input face 25a is flat and the exit face 25b is convex.
• the reference “f” represents an example of a projected ray.
• the prism 26 is configured, in terms of angle and choice of materials, for the totality of the light rays coming from the input device 22 to be transmitted to the matrix of micro-mirrors 23 and for the totality of the light rays reflected by the latter is reflected by the first face 26a.
• the area of the first face 26a through which the rays "a” enter the prism 26 and the area of the first face 26a by which the rays "c" reach again the first face 26a to be reflected may overlap.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Optics & Photonics (AREA)
• Non-Portable Lighting Devices Or Systems Thereof (AREA)
• Optical Elements Other Than Lenses (AREA)
• Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=61187486

Family Applications (1)

Country Status (5)

Families Citing this family (1)

Family Cites Families (21)

• 2017
  • 2017-11-30 FR FR1761493A patent/FR3074260B1/fr active Active
• 2018
  • 2018-11-30 WO PCT/EP2018/025303 patent/WO2019105588A1/fr unknown
  • 2018-11-30 CN CN201880076546.1A patent/CN111406181B/zh active Active
  • 2018-11-30 EP EP18836347.7A patent/EP3717828B1/de active Active
  • 2018-11-30 US US16/763,115 patent/US20200408377A1/en not_active Abandoned

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