EP3620713A1 - Optisches monoblockteil eines kraftfahrzeugs, das eine strukturveränderung umfasst - Google Patents

Optisches monoblockteil eines kraftfahrzeugs, das eine strukturveränderung umfasst Download PDF

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Publication number
EP3620713A1
EP3620713A1 EP19194764.7A EP19194764A EP3620713A1 EP 3620713 A1 EP3620713 A1 EP 3620713A1 EP 19194764 A EP19194764 A EP 19194764A EP 3620713 A1 EP3620713 A1 EP 3620713A1
Authority
EP
European Patent Office
Prior art keywords
diopters
optical part
light
adjacent
junction
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
EP19194764.7A
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English (en)
French (fr)
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EP3620713B1 (de
Inventor
Pierre Renaud
Alexandre Joerg
François GRATECAP
Yves Gromfeld
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Valeo Vision SAS
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Valeo Vision SAS
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Publication of EP3620713A1 publication Critical patent/EP3620713A1/de
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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
    • F21S41/10—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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • 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
    • F21S41/30—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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/47—Attachment 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
    • 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
    • F21W2102/135—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions
    • F21W2102/14—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions having vertical cut-off lines; specially adapted for adaptive high beams, i.e. wherein the beam is broader but avoids glaring other road users
    • F21W2102/145—Arrangement or contour of the emitted light for high-beam region or low-beam region the light having cut-off lines, i.e. clear borderlines between emitted regions and dark regions having vertical cut-off lines; specially adapted for adaptive high beams, i.e. wherein the beam is broader but avoids glaring other road users wherein the light is emitted between two parallel vertical cutoff lines, e.g. selectively emitted rectangular-shaped high beam
    • 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 an optical part intended to be mounted in a motor vehicle lighting device.
  • the invention relates to an optical part which is placed in front of one or more light sources in order to propagate light rays emitted by said one or more sources.
  • the invention relates to an optical part comprising several input dioptres and / or several output dioptres.
  • optical modules capable of generating a pixelated beam, the projection of which forms an image composed of illumination units, also called "pixels" in English. Said units are organized in at least one horizontal and / or vertical row and each of the illumination units can be activated selectively.
  • Such an optical module is used in addition to a second optical module capable of generating a main lighting and signaling beam to form a lighting and signaling beam incorporating an adaptive function.
  • the pixelated beam is illuminated with a low portion of the low beam to perform an additional lighting function, namely a cornering tracking function, called DBL- "Dynamic Bending Light" in English.
  • This function is used to illuminate the interior of the turn that the vehicle is taking or about to take.
  • the pixelated beam is illuminated with a portion of the road beam in order to perform an adaptive road function, called ADB, for “Adaptive Driving Beam”, intended to provide better visibility to the driver of the vehicle while avoiding dazzling the driver of a vehicle coming opposite.
  • ADB adaptive road function
  • the optical module capable of generating a pixelated beam comprises a plurality of elementary light sources which can be activated selectively, and united in a matrix of elementary light sources, an optical part placed in front of said matrix and projecting a light beam towards the front.
  • the optical part comprises light guides generally arranged in parallel directions, and an input diopter and / or an output per guide.
  • the number of guides corresponds to the number of elementary light sources. Alternatively, the number of guides is greater than the number of elementary light sources.
  • the elementary light sources can be light-emitting diodes also commonly called LEDs.
  • the input diopter is disposed at one end of said guide so as to form the light entry through which light rays pass to enter the guide.
  • Each input diopter is placed in front of an elementary light source.
  • the outlet is arranged at another end of the guide and thus forms an outlet for the light rays.
  • the outputs of the guides are imaged by one or more projection optics so as to form a pixelated beam.
  • the illumination units correspond to the outputs of the light guides.
  • parasitic light rays are understood to mean rays which come from a first light source disposed opposite a first input diopter and reach neighboring guides, situated on either side of said first entry diopter. These rays then propagate in a guide which is not intended for them.
  • Stray light rays are also considered to be light rays which are propagated in a first light guide and which reach the output diopters of the other light guides located on either side of said first guide.
  • Spurious rays are recognized on the image projected by the optical module. Indeed, because of the parasitic rays, the external edges of the illumination units do not have the expected shapes and the beam includes light overcurrents which degrades the quality of the pixelated beam.
  • the technical problem which the invention aims to solve is therefore to provide a more precise pixelated beam with good lighting quality.
  • the junction between two adjacent input diopters and / or the junction between two adjacent output diopters has at least one structural modification making it possible to absorb and / or diffuse light.
  • the modification of structure plays the role of a barrier which diffuses and / or absorbs parasitic light rays.
  • the light rays of a first elementary light source located opposite a first input diopter, are absorbed or scattered at the junction between this first input diopter and a diopter d 'adjacent entrance.
  • far fewer rays of light from the first light source can propagate in the guide next to it.
  • a first output diopter is called the one located downstream of a first light guide and a second output diopter that downstream of a second light guide light placed next to the first guide.
  • the light rays propagating in the first light guide are absorbed or scattered at said junction .
  • the structural modification at the level of the junction between adjacent diopters allows either to reduce the light intensity of the image of stray rays formed by the optical part, or to prevent the formation of the image of stray rays by the output diopter which precedes the light guide neighbour.
  • the optical module carrying said part generates a clear and precise light beam while respecting the conditions of the regulations.
  • the terms “front”, “rear”, “lower”, “upper”, “top”, “bottom”, “side”, “right”, “left” refer to the direction of transmission of light out of the corresponding optical part.
  • the terms “upstream” and “downstream” refer to the direction of propagation of light in the object which quotes them.
  • the terms “horizontal”, “vertical” or “transverse” are defined relative to the orientation of the optical part in which it is intended to be mounted in the vehicle.
  • the term “vertical” designates an orientation perpendicular to the plane of the horizon while the term “horizontal” designates an orientation parallel to the plane of the horizon.
  • the optical part 100 comprises three rows of optical elements, including a first row 11, a second row 12 and a third row 13 of optical elements.
  • Each row includes light guides and juxtaposed lenses.
  • the optical elements of the first row 11 are also called the first optical elements 11.
  • the optical elements of the second row 12 are also called the second optical elements 12.
  • optical part 100 composed of these three rows 11, 12 and 13 of optical elements is produced in a single part, hence the name of “monobloc optical part”.
  • the first row 11 of optical elements comprises first light guides 110 and a first lens 115.
  • Each first light guide 110 includes an inlet face and an outlet.
  • the entry face forms a first entry diopter 111.
  • the first lens 115 extends laterally so as to cover the outlets of the first light guides 110.
  • the first lens 115 is arranged so that the outlets of the first light guides 110 are coplanar with the focal plane of said first lens 115.
  • the first lens 115 has a curved surface 116.
  • the curved surface 116 is convex towards the front and arranged so that it forms a first output diopter 112 of the first optical element 11.
  • the curved surface 116 can be in the shape of a portion of a sphere, that is to say curved towards the front horizontally and vertically, so as to spread the beam generated by the first optical element 11.
  • the first input diopters 111 are placed in contact one next to the other so as to form a transverse row 113 of first input diopters 111.
  • the first light guides 110 and the first lens 115 are produced in one piece. It should be noted here that the light guides are not separated from each other between the first input diopters 111 and the output diopter of the lens 115.
  • each second optical element 12 comprises a second guide 120 followed by a second lens 125.
  • the second guide 120 extends longitudinally from the rear towards the front along the optical axis L of the optical part 100.
  • Each second guide 120 includes an inlet face and an outlet. The entry face forms a second entry diopter 121.
  • the second optical element 12 comprises one lens per guide.
  • Each second lens 125 also includes a curved surface 126.
  • Each second lens 125 is placed downstream from the corresponding second guide 120 so that the outlet of said guide is in the focal plane of said lens.
  • the curved surface 126 of the second lens 125 is oriented towards the front so as to form a second output diopter 122.
  • the second output diopters 122 are arranged in contact side by side.
  • the third row 13 of optical elements has the same configuration as the first row 11 of optical elements.
  • Each third optical element 13 comprises a third light guide 130 and a third lens 135.
  • Each third light guide 13 comprises an entry face forming a third entry diopter 131 and an exit placed in a focal plane of the corresponding third lens 135.
  • each third lens 135 it comprises a curved surface 136 oriented towards the front so as to form a third output diopter 132.
  • the third input diopters 131 are placed in contact with one another so as to form a transverse row 133 of third input diopters.
  • the third output diopters 132 are placed in contact one next to the other so as to form a transverse row 134 of third output diopters.
  • the input diopters are visible on the rear face 15 of the optical part 100 while the output diopters are visible on the front face 14 of the optical part 100.
  • the particularity of the first optical elements 11 is that the first light guides 110 extend vertically so as to have the row 113 of the first input diopters 111 and the first output diopter 112 at two different levels.
  • the row 113 of the first input diopters 111 is placed above the first output diopter 112.
  • the third optical elements 13 also include the third light guides 130 which extend vertically.
  • the row 133 of the third input diopters 131 and the row 134 of the third output diopters 132 are at two different levels.
  • the row 133 of the third input diopters 131 is placed below the row 134 of the third output diopters 132.
  • the input diopter 121 is at the same level as the output diopter 122.
  • the one-piece optical part 100 is placed in front of light emitting means which are, here, composed of a plurality of elementary light sources 3.
  • the elementary light source 3 is a light-emitting diode, also called LED in French and LED according to the acronym in English.
  • the elementary light sources 3 are arranged in several transverse rows.
  • the number of rows of elementary light sources corresponds to the number of rows of light guides, here three in number.
  • the optical part 100 is positioned with respect to the emission means so that each row 113, 123, 133 of input diopters 111, 121, 131 is placed opposite a row of elementary light sources 3.
  • each first input diopter 111 faces an elementary light source 3 of a first row 31 of elementary light sources.
  • each second input diopter 121 faces an elementary light source 3 of a second row 32 of elementary light sources.
  • each third input diopter 131 is opposite an elementary light source 3 of a third row 33 of elementary light sources.
  • the elementary light sources forming part of the first row of source are also called the first elementary light sources 310.
  • the figure 4 presents in detail the path of the light rays coming from the elementary light sources 310, 320 and 330 in the optical part 100.
  • each first source 310 emits first rays R1 which enter the optical part through the first input diopter 111.
  • the first rays R1 are then reflected by a first reflection surface 311 which is positioned opposite the first input diopter 111.
  • the first reflection surface 311 is configured so as to collimate the first rays R1 and to direct them towards a second reflection surface 312.
  • the first rays R1 reflected go longitudinally towards the first output diopter 112. The latter projects the first rays R1 forward to form a first beam 315 .
  • the first beam 315 is projected by a projection system (not illustrated in the figures).
  • the image of the first unitary beam 315 has a shape corresponding to that of the first light sources 310.
  • the image of the first beam 315 forms a low part of the passing beam.
  • the second light source 320 emits the second light rays R2 which pass through the second input diopter 121 for enter the optical part 100.
  • the second input diopter 121 is represented schematically by a plane for simplicity, but it is advantageously slightly convex so as to produce a relief in the direction of the second source 320.
  • the second light rays R2 then propagate by total internal reflection until reaching the second output diopter 122. The latter thus projects the second light rays R2 forward forming a second unitary beam 325.
  • the second unitary beam 325 is projected by a projection system (not illustrated in the figures).
  • the image of the second unitary beam 325 comprises an illumination unit whose shape corresponds to that of the second output diopter 122.
  • the third light source 330 emits third rays R3 which enter the optical part through the third input diopter 131.
  • the third rays R3 are then reflected by a third reflection surface 313 disposed substantially at the same level as the third diopter entry 133.
  • the third reflected rays R3 are then directed upwards and here, towards a fourth reflection surface 314 which send them towards the third exit diopter 132. This latter projects the third rays R3 towards the front so as to form a third beam unit 335.
  • the second and third rows of optical elements 12 and 13 is arranged so as to generate a pixelated beam.
  • a pixelated beam groups together a number of unitary beams, each of which is produced by an elementary light source in conjunction with an optical element.
  • the image of the unitary beam includes an illumination unit, also called “pixel” in English.
  • the figure 5 illustrates by way of example and schematically a first image I1 of two pixelized unitary beams 325 each generated from a second light source 320 and a second optical element 12.
  • the first image I1 is obtained by projecting the second beam on a screen at 25 m.
  • the first image I1 is projected onto the screen in an orthogonal coordinate system R composed on the ordinate of a vertical axis V and on the abscissa a horizontal axis H.
  • the vertical axis V corresponds to a vertical axis above the road and the horizontal axis H symbolizes the horizon.
  • the first image I1 comprises two illumination units 4 of rectangular shape.
  • each unit 4 has imperfections, in particular, at the level of the two lateral edges 41 of each unit 4. Indeed, for each unit 4, the two lateral edges 41 are not straight lines as expected .
  • Each lateral edge 41 comprises a convex part 43 followed by an inclined line 42 which joins a lower edge 44 of the illumination unit 4. This causes the illumination unit 4 to have an irregular trapezoid shape including a projection lateral.
  • the illumination units 4 are positioned one beside the other.
  • the domed portion 43 in lateral projection overlaps with a domed portion 43 in lateral projection of a neighboring illumination unit.
  • the Applicant has identified that the poor formation of the illumination units is due to parasitic light rays.
  • a minority portion of the light rays propagated in a light guide can enter the neighboring guide at the junction between two output diopters of these guides.
  • the rays, so-called “lost” or “parasitic”, are exited by the exit diopter of the neighboring light guide.
  • the stray rays form irregularities on the illumination unit imaged by the neighboring light guide. The phenomenon is applicable for each light guide and its neighbors on the left and on the right. The same goes for each row of optical elements.
  • the applicant proposes, according to an example of the invention, a structural modification at the junction output diopters, when there is a risk of leakage of light rays from one guide to another to reach the output diopter of the other guide.
  • the junction 6 between two diopters of adjacent outputs 122 or 132 can form a line of separation 6 of said dioptres.
  • the separation lines 6 are visible on the front face 14 of the optical part 100 on the figure 1 .
  • the structural modification consists in heating the material of the separation line 6 so as to change the nature of the material thereof.
  • the optical part 100 being formed from polycarbonate (PC), the junction 6 between two adjacent output diopters 122 or 132 thus consists of this material.
  • PC polycarbonate
  • Polycarbonate is known for its transparency.
  • the junction 6 between two adjacent output diopters is therefore originally transparent.
  • the junction 6 is heated until there is a change in the composition of the material, here, until the transparency of the junction 6 turns into a opaque and dark appearance, close to the color black.
  • the junction 6 has a new aspect constituting an opaque barrier which stops all the light rays coming into contact with it.
  • This treatment is also called blackening of the junction. During this treatment, at first, gas escapes and there is burning on the surface of the junction. In a second step, the junction changes from the transparent color to the black color.
  • the processing is applied to all the junctions of the output diopters of the second and third rows of optical elements.
  • the second and third output diopters 122, 132 of the optical part have the same width dimension, the junctions 6 between the adjacent output diopters are aligned.
  • the heat source used is a laser source, in particular of the YAG aluminum garnet type YAG at a wavelength of 1064 nm.
  • a laser source of the fiber laser type with a wavelength between 1050 nm and 1070 nm can also be used.
  • the modification of the structure 7 of the junctions 6 between the second output diopters 122 is visible at the figure 6 .
  • the structural modification 7 is carried out at the junction 6 between two adjacent output diopters 122.
  • the processing time of the junction 6 is such that the modification of the structure 7, here the transformation into black color of the material, extends deep into the material of the optical part 100 so as to form an opaque wall 73 at the inside of the material.
  • the opaque wall 73 extends in the longitudinal direction L from the junction 6. The extent of the wall 73 in the longitudinal direction L depends on the duration of treatment for junction 6.
  • this opaque wall 73 absorbs any parasitic light ray Rp which tends to propagate in the guide or guides which are not intended for it.
  • the structural modification significantly improves the quality of the projected image of the beam.
  • a second image I2 is illustrated, comprising illumination units 5, generated from the second output diopters 122, the junction 6 between two adjacent diopters 122 comprises a structural modification 7 as illustrated in FIG. figure 6 .
  • These units 5 now have a regular rectangular shape with straight side edges 51, which avoids overlapping of the illumination units 5 juxtaposed side by side.
  • the pixelated beam resulting from these unitary pixelized beams has a uniform light intensity distribution, the sign representing a quality beam which provides better viewing comfort to users.
  • the structural modification as described above could be applied to the first input diopters 111 of the first row 113.
  • the first input diopters 111 are arranged in contact one next to the other.
  • a separation line is located between two first adjacent input diopters 111. In other words, this dividing line forms a junction which separates two first adjacent input diopters 111.
  • the figure 8 partially illustrates an optical part 201 having interstices between adjacent input diopters.
  • the optical part 200 comprises a row 23 of optical elements 2 juxtaposed.
  • Each optical element 2 comprises a light guide 20.
  • Each light guide comprises an entry face forming an entry diopter 80.
  • Each entry diopter 80 is placed opposite an elementary light source 24 corresponding so that the majority of the light rays emitted by said light source crosses the input diopter 80 to then propagate in the light guide 20.
  • the light propagates from rear to front along an optical axis L of optical part 201, as illustrated by the arrow L on the figure 8 .
  • the input diopters 80 are spaced from each other so that a gap 90 separates the adjacent input diopters 80.
  • the interstice 90 comprises walls which together constitute the junction 90 between the input diopters 80 which it separates.
  • the gap 90 comprises three walls, including a right side wall 90a, a left side wall 90b and a bottom wall 90c.
  • the bottom wall 90c is perpendicular to the direction of propagation of the light.
  • the side walls 90a and 90c are here symmetrical in mirror with respect to a main axis I of the interstice.
  • the main axis I of the gap passes through the middle of the bottom wall 90c and is parallel to the direction of light propagation and.
  • the side walls are slightly inclined, in an opposite manner, relative to this main axis I.
  • FIG 8 only a light source 24 is shown.
  • This light source 24 is placed in front of a first input diopter 81 followed by a first guide 21.
  • the first input diopter 81 is spaced from its neighboring input diopter 82, also called second input diopter 82 , by a first gap 91.
  • This first gap 91 includes the right side wall 911 which connects the bottom wall 913 to the first inlet diopter 81 and the left side wall 912 which connects the bottom wall 913 to the second inlet diopter 82.
  • the optical part 201 can cause the presence of parasitic light rays.
  • the figure 8 schematically illustrates a possible path for stray light rays.
  • the parasitic ray starting from the light source 24, firstly comes into contact with the left side wall 912 of the first gap 91, at a location located near the second input diopter 82. The parasitic ray then enters by refraction in the second light guide 22 next to the left of the first light guide 21.
  • the parasitic ray then propagates inside the second light guide 22 in a direction of lateral propagation T in order then to go towards the right side wall 921 of a second gap 92.
  • the second gap 92 is that placed between the second input diopter 82 and the input diopter of a third guide 23 neighbor to the left of the second guide 22.
  • This input diopter is also called third input diopter 83.
  • the parasitic ray enters the third light guide 23 through a left side wall 932 of the second interstice 92, this side wall also forming the right side wall of the third guide 23.
  • the stray ray continues to propagate laterally. It leaves the third light guide 23 passing through the right side wall 931 of a third gap 93, that interposed between the third input diopter 83 and a fourth input diopter 84 of a fourth light guide 24.
  • the stray ray comes into contact with the bottom wall 933 of the third gap 93 and enters inside the optical part 201 by refraction. Everything then happens as if the back wall 933 was illuminated. Thus, the image of the illuminated back wall 933 is projected to infinity by the projection system of the optical part.
  • the propagation of stray light rays can cause imperfections in the light beam generated by the optical part. These imperfections are represented in particular in the figure 9 , and as here can correspond to overcurrents in the already lit areas or light up slightly areas which should be turned off.
  • the figure 9 illustrates an image of a beam generated by the elementary light source and by the optical part, shown in the figure 8 .
  • This image is also called third image I3.
  • the third image I3 is obtained on a vertical screen located at a distance from a light module containing the optical part 201, for example at 25 meters, and opposite said module.
  • Image I3 is projected onto the screen in an orthogonal coordinate system R composed on the ordinate of a vertical axis V and on the abscissa of a horizontal axis H.
  • the vertical axis V corresponds to a vertical axis above the road and the horizontal axis H symbolizes the horizon.
  • the beam image I3 comprises an illumination unit 25 of rectangular shape and imperfections, here three fine streaks of light 26.
  • the light streaks 26 are formed by the stray light rays projected by the light module.
  • the parasitic light rays are propagated in the neighboring guides and imaged by a projection optic to form one or more streaks of light at the place where there is an illumination unit which is specific to the neighboring guide.
  • the illumination unit 27 specific to the neighboring guide, here the second, third and fourth light guides 22, 23 and 24, is shown in dotted lines on the figure 9 .
  • the light streak (s) 26 add light intensity to that of the illumination unit 27 of the neighboring guide.
  • the presence of the light streak (s) 26 is not desirable , because it may increase the light intensity beyond the regulated value and / or generate visual discomfort.
  • the curve of evolution of the light intensity C of the image indicates that the streaks of light have a fairly high light intensity.
  • the light streaks 26 therefore provide a surplus of the light intensity of the illumination units specific to neighboring guides.
  • the value of the light intensity, measured at the point where there is the superimposition of the streak of light 26 with the illumination unit 27, generates visual discomfort, or even a risk of exceeding the prescribed regulatory value. .
  • the presence of these streaks of light prevents the total extinction of the illumination units formed by the neighboring light guides.
  • the light sources arranged opposite the neighboring guides here the second, third and fourth light guides 22, 23, 24 are switched off, the corresponding illumination units are also switched off.
  • the light source 24 located opposite the first guide 21 remains on, the stray rays persist.
  • the light streaks 26 remain lit at the location of the illumination units of the neighboring guides which are nevertheless extinct. We can therefore have residual light which can be dazzling for a conductor coming opposite.
  • the applicant proposes a structural modification at the junction of the input diopters, according to an exemplary embodiment of the invention.
  • a graining 70 is produced locally on at least one wall of the gap, as illustrated on the figure 10 .
  • the graining 70 can be practiced on the left side wall 912 of the first gap 91 and closest to the second input diopter 82.
  • a first graining zone 71 which is illustrated by a block surrounded by dotted lines.
  • the longitudinal extent of the graining zone 71 depends on the configuration of the light guides and that of the input diopters.
  • a graining zone similar to the first graining zone 71 could be produced in the interstices separating the input diopters 121 of the second row 123 of the optical part 100 illustrated in the first embodiment.
  • the graining is carried out at cleverly chosen places, for example, in the back wall or in the side wall and as close as possible to the input diopter, because these places are on the path very often taken by stray light rays.
  • the graining can be carried out locally at other places where the stray light rays pass.
  • the graining can be practiced identically in the interstices in order to effectively diffuse the stray light rays from all the elementary light sources.
  • each gap may include graining on the bottom wall, on a part of the side walls which is located close to the input diopters.
  • the figure 11 shows the advantageous technical effect brought by the structural modification to the pixelated beam obtained.
  • the figure 11 illustrates an image I4 of the beam generated by the elementary light source and by the optical part 200 shown in the figure 10 .
  • This image is also called the fourth image I4.
  • Image I4 is obtained under the same conditions as those of figure 9 . It is represented in a reference identical to the reference of the figure 9 .
  • the image I4 comprises the illumination unit 25 corresponding to the elementary light source 24 and the light bands 46 corresponding to the stray light rays.
  • the light bands 46 due to the stray light rays have a more extensive shape with a lower light intensity than that of the light streaks of the figure 9 .
  • the parasitic light rays are diffused during contact with said zones. This spreads the strips of light 46 and considerably reduce the light intensity of these bands.
  • the light bands 46 coming from the optical part 201 comprising the structural modifications 70, 71, 72 add a low, even negligible intensity to that of an illumination unit 27 corresponding to a neighboring guide.
  • the value of the light intensity, measured at the point where there is the superimposition of the light strip 46 with the illumination unit 27, improves visual comfort and / or reduces the risks of exceeding the value imposed by regulations.
  • a reflective, absorbent and / or diffusing coating may be applied to the junction between the adjacent input diopters.
  • the coating can partially occupy the total surface of the walls constituting the junction. It can be positioned at places which are on the path of propagation of parasitic light rays, in particular at the level of the back wall, on the side walls and close to the input diopters. For example, the coating can be positioned at the same locations in the graining zones 71, 72 of the example described above.
  • a reflective coating it can be applied to all of the side walls, or even also to the bottom of the interstices.

Landscapes

  • 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)
  • Optical Couplings Of Light Guides (AREA)
  • Light Guides In General And Applications Therefor (AREA)
EP19194764.7A 2018-09-07 2019-08-30 Optisches monoblockteil eines kraftfahrzeugs, das eine strukturveränderung umfasst Active EP3620713B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1858047A FR3085737B1 (fr) 2018-09-07 2018-09-07 Piece optique monobloc de vehicule automobile comprenant une modification de structure

Publications (2)

Publication Number Publication Date
EP3620713A1 true EP3620713A1 (de) 2020-03-11
EP3620713B1 EP3620713B1 (de) 2023-03-01

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US (1) US11028990B2 (de)
EP (1) EP3620713B1 (de)
JP (1) JP7418999B2 (de)
CN (1) CN110887010B (de)
FR (1) FR3085737B1 (de)

Cited By (1)

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WO2023030808A1 (fr) * 2021-08-31 2023-03-09 Valeo Vision Module lumineux pour vehicule automobile

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CN112752925B (zh) * 2019-06-05 2023-04-25 华域视觉科技(上海)有限公司 车灯光学元件、车灯模组、车辆前照灯及车辆
CN214038235U (zh) * 2020-11-27 2021-08-24 华域视觉科技(上海)有限公司 远光光学元件、远光照明单元和车辆
EP4043783B1 (de) * 2021-02-09 2023-08-09 ZKW Group GmbH Projektions- und beleuchtungsvorrichtung für einen kraftfahrzeugscheinwerfer
US20230366522A1 (en) * 2022-05-13 2023-11-16 Valeo North America, Inc. Light control in an optical element

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JP2008181705A (ja) * 2007-01-23 2008-08-07 Toyota Motor Corp ランプ構造体
DE102010044424A1 (de) * 2010-09-04 2012-03-08 Hella Kgaa Hueck & Co. Beleuchtungsvorrichtung für Fahrzeuge
EP2587125A2 (de) * 2011-10-27 2013-05-01 Automotive Lighting Reutlingen GmbH Scheinwerferprojektionsmodul für ein Kraftfahrzeug
US20140133168A1 (en) * 2012-11-09 2014-05-15 Osram Gmbh Lighting device
EP2998645A2 (de) * 2014-09-16 2016-03-23 Valeo Vision Beleuchtungsvorrichtung eines fahrzeugs, die eine optische linse mit mehreren quellen verwendet
JP2016212962A (ja) * 2015-04-30 2016-12-15 日亜化学工業株式会社 照明装置
EP3208527A1 (de) * 2016-02-16 2017-08-23 Valeo Vision Belgique Signalleuchte mit fokussierenden lichtstrahl
DE102017002394A1 (de) * 2016-06-17 2017-12-21 Docter Optics Se Verfahren zum Herstellen eines Vorsatzoptikarrays für einen Fahrzeugscheinwerfer

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FR3056683B1 (fr) * 2016-09-26 2019-04-05 Valeo Vision Module lumineux, notamment d'eclairage et/ou de signalisation pour vehicule automobile
CN108302470A (zh) * 2016-09-28 2018-07-20 法雷奥照明湖北技术中心有限公司 光图案化装置与车灯
FR3056693B1 (fr) * 2016-09-29 2020-06-19 Valeo Vision Dispositif d'eclairage en bandes pour projecteur de vehicule automobile
IT201600121552A1 (it) * 2016-11-30 2018-05-30 Automotive Lighting Italia Spa Fanale automobilistico comprendente una porzione di emissione luminosa ad effetto opalescente

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Publication number Priority date Publication date Assignee Title
JP2008181705A (ja) * 2007-01-23 2008-08-07 Toyota Motor Corp ランプ構造体
DE102010044424A1 (de) * 2010-09-04 2012-03-08 Hella Kgaa Hueck & Co. Beleuchtungsvorrichtung für Fahrzeuge
EP2587125A2 (de) * 2011-10-27 2013-05-01 Automotive Lighting Reutlingen GmbH Scheinwerferprojektionsmodul für ein Kraftfahrzeug
US20140133168A1 (en) * 2012-11-09 2014-05-15 Osram Gmbh Lighting device
EP2998645A2 (de) * 2014-09-16 2016-03-23 Valeo Vision Beleuchtungsvorrichtung eines fahrzeugs, die eine optische linse mit mehreren quellen verwendet
JP2016212962A (ja) * 2015-04-30 2016-12-15 日亜化学工業株式会社 照明装置
EP3208527A1 (de) * 2016-02-16 2017-08-23 Valeo Vision Belgique Signalleuchte mit fokussierenden lichtstrahl
DE102017002394A1 (de) * 2016-06-17 2017-12-21 Docter Optics Se Verfahren zum Herstellen eines Vorsatzoptikarrays für einen Fahrzeugscheinwerfer

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Publication number Priority date Publication date Assignee Title
WO2023030808A1 (fr) * 2021-08-31 2023-03-09 Valeo Vision Module lumineux pour vehicule automobile
FR3127547A1 (fr) * 2021-08-31 2023-03-31 Valeo Vision Module lumineux à sources à partie émissive maximisée

Also Published As

Publication number Publication date
JP2020043067A (ja) 2020-03-19
US11028990B2 (en) 2021-06-08
CN110887010A (zh) 2020-03-17
US20200080699A1 (en) 2020-03-12
FR3085737B1 (fr) 2021-04-02
FR3085737A1 (fr) 2020-03-13
CN110887010B (zh) 2023-12-26
JP7418999B2 (ja) 2024-01-22
EP3620713B1 (de) 2023-03-01

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