• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    The invention relates to a motor vehicle lighting device (2) comprising a plurality of primary optical elements (6), intermediate lenses (8) and a curved projection lens (8). Each primary optical element (6) is provided with a curved output diopter (16) and with a plurality of rectangular lightguides (14) for co-operating each with a light-emitting diode (12) or a laser. Each intermediate lens (8) is disposed between an output diopter (16) of primary optical element (6) and the projection lens (4). Each intermediate lens (8) is configured to distribute and focus the radiation from an element exit diopter (16) to the projection lens (4). The device is configured to project the rays (26) of the diodes entering the light guides and exiting through the projection lens in the form of a light pixel, or light bands, each of which is controlled despite the curvature of the light. the projection lens (4).
    公开号:FR3056693A1
    申请号:FR1659375
    申请日:2016-09-29
    公开日:2018-03-30
    发明作者:Yves Gromfeld；Antoine De Lamberterie
    申请人:Valeo Vision SA；
    IPC主号:
    专利说明:

    Technical Field [0001] The invention relates to the field of lighting devices, in particular for motor vehicle headlights. The invention also relates to a headlight optical unit for a motor vehicle provided with a lighting device according to the invention.
    PRIOR ART [0002] A motor vehicle is equipped with headlights, or headlights, intended to illuminate the road in front of the vehicle, at night or in the event of reduced light. These headlights can generally be used in two lighting modes: a first high beam mode and a second low beam mode. The main beam mode makes it possible to strongly illuminate the road far in front of the vehicle. The low beam mode provides more limited lighting of the road, but nevertheless offers good visibility, without dazzling other road users. These two lighting modes are complementary. The driver of the vehicle must manually change modes depending on the circumstances, at the risk of inadvertently dazzling another road user. In practice, changing the lighting mode manually can be unreliable and can sometimes be dangerous. In addition, the low beam mode provides visibility that is sometimes unsatisfactory for the driver of the vehicle.
    To improve the situation, headlamps with an Adaptive Driving Beam (ADB) function have been proposed. Such an ADB function is intended to automatically detect a road user likely to be dazzled by a light beam emitted in high beam mode by a headlamp, and to modify the outline of this light beam so create a gray area where the detected user is located. The advantages of the ADB function are multiple: comfort of use, better visibility compared to lighting in traffic light mode
    2/14 crossover, better reliability for mode change, greatly reduced risk of glare, safer driving.
    Document EP2743567A1 discloses a motor vehicle headlamp provided with modules generating lighting in strips through a projection lens. Each module includes a series of light guides for shaping radiation from light-emitting diodes. Thanks to such a projector, it is possible to illuminate an environment using light strips whose positions are controlled. However, the integration of a projector in a given vehicle imposes a shape on the projection lens of the lighting modules. It must then respect a curvature, a precise curve. This constraint generates geometric distortions such as field aberrations. Some bands then show fluctuations in light intensity, and possibly dark areas. The combination of the bands becomes unsuitable for automotive lighting, and affects the driving safety of the vehicle due to the heterogeneities.
    Summary of the invention
    Technical problem The invention aims to solve at least one of the problems posed by the prior art. More specifically, the invention aims to reduce the field aberrations of a strip lighting device for a projector. The invention also aims to reduce the geometric distortions of such a lighting device despite external geometric constraints, in particular a curvature of the projection lens.
    Technical solution The invention relates to a strip lighting device for a motor vehicle headlight comprising: a primary optical element provided with pixel forming means intended to cooperate with a primary light source, and a output diopter; a projection lens; the device being configured so as to project light
    3/14 entering the pixel forming means and leaving the projection lens in the form of a light pixel, such as a light strip; remarkable in that it further comprises an intermediate lens which is disposed between the output diopter of the primary optical element and the projection lens, and which is configured so as to concentrate the radiation coming from the output diopter of the primary optical element on the projection lens.
    According to an advantageous embodiment of the invention, the output diopter of the primary optical element is generally spherical, and the pixel-forming means comprise at least one light guide having a rectangular profile transverse to the direction of device lighting.
    According to an advantageous embodiment of the invention, in the normal mounting direction the intermediate lens comprises an input diopter with a convex profile in a horizontal plane, and possibly a concave profile in a vertical plane.
    According to an advantageous embodiment of the invention, in the normal mounting direction the intermediate lens comprises an output diopter with a convex profile in a vertical plane, and possibly in a horizontal plane.
    According to an option of the invention, in the normal direction of mounting the intermediate lens comprises a real focus and is higher than the projection lens, or the intermediate lens comprises a virtual focus and is lower than the lens of projection.
    According to an advantageous embodiment of the invention, the primary optical element comprises several light guides, each intended to cooperate with a primary light source, the device being configured so as to project several light pixels, in particular several light bands parallel, which each correspond to one of the primary light sources.
    According to an advantageous embodiment of the invention, the device comprises at least one primary light source, in particular a light-emitting diode and / or a laser, each source being associated with a light guide.
    According to an advantageous embodiment of the invention, along a vertical plane in the normal mounting direction, the projection lens comprises an input diopter with a concave or plane profile and an output diopter with a profile convex.
    According to an advantageous embodiment of the invention, along a vertical plane in the normal direction of assembly, the projection lens has a divergent lens profile.
    According to an advantageous embodiment of the invention, the device comprises several primary optical elements and several intermediate lenses, each associated with a primary optical element and disposed between the projection lens and an associated primary optical element, the projection lens having a continuous output diopter along the intermediate lenses.
    According to an advantageous embodiment of the invention, in a horizontal plane in the normal mounting direction, the combination of a primary optical element and an intermediate lens forms a module with an optical axis, the device comprises at at least three consecutive modules whose optical axes are inclined relative to normal to the output diopter of the projection lens, respectively, by an angle β between -2 ° and -15 °, by an angle β equal to 0 °, with an angle β between 2 ° and 10 °.
    According to an advantageous embodiment of the invention, in a horizontal plane in the normal mounting direction, the combination of a primary optical element (6) and an intermediate lens forms a module with an optical axis, the device comprises at least three consecutive modules whose optical axes are inclined relative to normal to the output diopter of the projection lens, respectively, by an angle β equal to 0 °, by an angle β between 2 ° and 10 °, and an angle β between 5 ° and 18 °.
    According to an advantageous embodiment of the invention, in a vertical plane in the normal mounting direction, the output lens has a main elongation along a main axis which is inclined from 0 to 10 ° relative to the horizontal direction, if necessary, the inclination between the main axis and the horizontal direction is 5 °. The vertical plane is the YZ plane defined in an orthonormal coordinate system where the X axis is the projection axis.
    According to an advantageous embodiment of the invention, the device comprises at least three primary optical elements each provided with means for forming pixels, along a horizontal plane in the normal direction of mounting the exit lens of the lens projection has a convex curvature with a radius of curvature less than 400 mm, preferably less than or equal to 150mm.
    According to an advantageous embodiment of the invention, in a horizontal plane in the normal mounting direction, the output diopter of the projection lens has a curvature, the thickness of the projection lens decreases in the opposite direction to projection direction.
    According to an advantageous embodiment of the invention, in a horizontal plane in the normal direction of assembly, the inclination a between the normal to the output diopter of the projection lens and the direction of projection increases in the direction of at minus one end of the projection lens.
    According to an advantageous embodiment of the invention, the projection lens comprises an input diopter with a concave toric surface and an output diopter with a convex or planar toric surface.
    According to an advantageous embodiment of the invention, in a vertical plane in the normal direction of assembly, the projection lens forms a strip of material, possibly with parallel edges.
    According to an advantageous embodiment of the invention, in a horizontal plane in the normal mounting direction, the projection lens is generally inclined relative to the projection direction and has a reduction in thickness in the direction opposite to the direction projection.
    In a vertical plane in the normal direction of assembly, the projection lens may have an input diopter with profile whose radius of curvature is less than the radius of curvature of the profile of its output diopter.
    The invention also relates to a motor vehicle headlight optical unit comprising a strip lighting device, remarkable in that said strip lighting device is in accordance with the invention.
    Benefits
    The invention makes it possible to correct field aberrations. It compensates for geometric variations using an additional lens. The correction to be made by the projection lens is lightened. Thus, the homogeneity and the sharpness of the bands produced are controlled in spite of singularly curved forms of projection lens. A strip light for a vehicle headlight according to the invention will provide more driving safety.
    Brief Description of the Drawings [0028] Figure 1 shows an isometric rear view of a strip lighting device according to the invention.
    Figure 2 illustrates a side view of a lighting device according to the invention.
    Figure 3 sketches a top view of a lighting device according to the invention.
    FIG. 4 is a representation of the isolux curves of pixels produced by the light sources of a primary optical element of a strip lighting device according to the invention.
    Description of the embodiments [0032] Figure 1 shows in a simplified manner a lighting device 2 according to the invention. The device is generally represented according to the direction of lighting. The device is partly represented via its diopters.
    The device 2 comprises, depending on the direction of lighting, lighting modules, in this case five, and a projection lens 4. Each lighting module comprises a primary optical element 6 and an intermediate lens 8 , the latter being disposed between the projection lens 4 and the associated primary optical element 6. The device comprises an optical axis 10 along which it illuminates, along which it generally concentrates and bends its rays.
    The device 2 can also comprise at least one light source 12, such as a light-emitting diode or a laser, which produces light rays entering the device via the primary optical element. Here, twenty light sources 12 are provided to create lighting in
    7/14 bands. The device 2 can also include a box which is not shown for the sake of clarity.
    On its input face, each primary optical element 6 comprises means for forming pixels. Said means comprise at least one light guide 14, four in this case, and a body with a curved output diopter 16. The pixel forming means may also include microlenses or pads. Each intermediate lens 8 comprises dioptres of input 18 and output 20 curves. They can each have toroidal shapes, i.e. surfaces generated by the rotation of a circle around an axis distant from the circle. The input dioptres 18 of the intermediate lenses 8 face the primary optical elements 6. The set of intermediate lenses 8 forms a generally curved row. Since the intermediate lenses 8 can be spaced from each other, covers (not shown) can be provided at their junctions to avoid parasitic radiation.
    The projection lens 4 comprises an input diopter 22 facing the intermediate lenses 8, and an output diopter 24. Each of its diopters is continuous and can be a generally toric surface. The projection lens 4 forms a ribbon of continuous material, the thickness of which varies from one end to the other. The maximum thickness can be observed at a distance from the ends according to the length.
    Figure 2 is a side view of the light device in the normal direction of mounting the device on a vehicle. A light source, a primary optical element, an intermediate lens and a projection lens are shown.
    The body of the primary optical element forms a correction portion with a dome surface 16, for example hemispherical. Each light guide 14, also called waveguide or optical guide, is associated with a primary light source 12, it conducts light through the material of the element. It has an elongation, possibly main, along the optical axis 10 of the device 2. The material constituting the light guides 14 and the body is transparent. This is here
    8/14 of a material for an optical lens, such as an organic material or possibly glass and came of matter. Such an optical element is well known to a person skilled in the art and can be produced as described in document EP2743567A1.
    In a vertical plane, the radiation 26 from the primary optical element 6 diverges. The intermediate lens 8 intercepts this divergent radiation 26 and the flap by concentrating it on the projection lens 4. It distributes the radiation 26 coming from the primary optical element 6 vertically over the height of the projection lens 4, preferably over the entire height.
    In section in a vertical plane, the intermediate lens 8 has an input diopter 18 with a substantially convex profile, or alternatively straight. The output diopter 20 of the intermediate lens 8 here has a concave profile. The vertical profile of the intermediate lens 8 acts as a converging lens, which returns the rays from the primary optical element along the optical axis 10, reducing the inclination of the rays relative to the optical axis. In this way, the vertical deviation that the intermediate lens 8 must provide is reduced, which simplifies its work. The vertical profile of the intermediate lens could also be that of a divergent lens. The intermediate lens 8 acts as a barrier for the primary rays, its height H2 is greater than the height H1 of the projection lens 4.
    In a vertical plane, the projection lens 4 has an input diopter 22 with a concave profile and output diopter 24 with a convex profile. The radius of curvature at the inlet is smaller than the radius of curvature at the outlet, so that the vertical profile of the projection lens 4 acts like a diverging lens.
    In a vertical plane, the rays from the projection lens 4 are generally parallel, and substantially inclined. They can be tilted from -2 ° to + 8 ° relative to the horizontal axis, the positive direction being upwards.
    Figure 3 shows a top view of a lighting device 2 in the normal direction of mounting the device on a vehicle. As
    9/14 for example, it may be a lighting device 2 front right of a motor vehicle.
    In a horizontal plane, each intermediate lens 8 has an input diopter 18 and an output diopter 20 convex, the input diopter 18 being more curved. The dioptres vary from one intermediate lens 8 to another in order to adapt to the inclination, to the curvatures of the projection lens portion 4 with which each intermediate lens 8 works. The output diopter 20 of each intermediate lens 8 is substantially curved, it can be essentially straight.
    In a horizontal plane, the radiation 26 from each primary optical element 6 diverges. Each intermediate lens 8 intercepts the diverging radiation 26 from a primary optical element 6 and deflects it by focusing it on an associated part of the projection lens 4. Each intermediate lens 8 distributes the radiation 26 coming from the primary optical element 6 horizontally on a dedicated area of the projection lens. At the exit of the intermediate lenses, the rays are generally parallel.
    The primary optical elements 6 are offset from each other in the general direction of projection. They follow the curvature of the input diopter 22 of the projection lens 4. The input diopter 22 of the projection lens 4 is essentially curved, and possibly smooth, its surface can also have a monotonous curvature. The output diopter 24 of the projection lens 4 is curved, possibly according to a monotonic curvature.
    The line 28 of the secondary foci of the projection lens 4 is at a distance D similar to its length L. The ratio between the distance D and the length is between 0.5 and 2; preferably between 0.8 and 1.2. The distance D and the length L can be equal to 20 cm.
    In a horizontal plane, for example the median plane, the direction normal to the output diopter 24 of the projection lens 4 is inclined at an angle a with respect to the rays emitted. The angle a can be zero in a central zone, and maximum at one end of the projection lens 4. The
    10/14 projection lens 4 has a maximum thickness in the area where the angle a is zero, and a minimum thickness where the angle a is maximum.
    In a horizontal plane, the optical axes 32 of modules are generally inclined at an angle β relative to the normal direction 30 to the output diopter 24. This inclination may result from the orientation and or the shape of the lenses intermediaries 8. The angle β varies from module to module, and may be zero for the module in the middle of a row of modules, or the module towards the internal edge of a row of modules. The neighboring modules have inclined optical axes 32 of angle β of -2 ° and + 10 ° respectively. The positive direction of the angle β being the clockwise direction.
    Figure 4 shows a simulation of the light radiation from a primary optical element projected onto a wall. An orthonormal coordinate system is used to illustrate the illuminated field using scales.
    The radiation forms several pixels 34, in this case five, which each correspond to one of the light sources of a primary optical element comprising five; which means that each pixel 34 corresponds to a given light source. Each pixel 34 can have a strip shape, generally a rectangle. The strips may have parallel vertical and / or horizontal edges. Such lighting can have a central area with, for example at least three similar bands; and possibly a lateral zone with less intense bands.
    Each strip is formed by a substantially divergent light beam whose width, along the horizontal axis, can be between 1 ° and 2 °. All of the bands have horizontal cuts, which favors the concentration of lighting at a given height. The strips produced are regularly angularly offset from one another, which can facilitate overlapping with strips of another primary optical element of the lighting device.
    At least two or the majority of the pixels 34 may have similar isolux curves 36. The configuration of the isolux curves 36 of the different pixels 34 can be symmetrical along a vertical plane. Each isolux curve 36 can indicate an increase in light intensity understood
    11/14 between 25% and 100%, possibly between 30% and 50%, compared to the previous isolux curve 36. The isolux curves 36 of the pixels 34 generally have rectangular shapes, certain isolux curves 36 can overlap at the vertical edges of the pixels 34. Similarly, certain isolux bands of a pixel can have overlapping isolux curves at the level d 'a lower edge. These characteristics reflect the clean and frank appearance of the light bands. The majority of pixels can have an equal or similar maximum light intensity. By similar can be understood a difference of less than 25%, preferably less than 5%.
    The features of the invention facilitate the superposition of the light bands in order to generate controlled lighting, both at the level of each primary optical element and at the level of the lighting device. Such radiation is particularly suitable for illuminating a dynamic environment of a moving motor vehicle.
    12/14
    权利要求:
    Claims (16)
    [1" id="c-fr-0001]
    Claims
    1. Strip lighting device (2) for a motor vehicle headlight comprising:
    - a primary optical element (6) provided with pixel forming means (14) intended to cooperate with a primary light source (12), and with an output diopter (16);
    - a projection lens (4);
    the device (2) being configured so as to project light entering the pixel forming means (14) and leaving through the projection lens (4) in the form of a light pixel (34), like a strip bright; characterized in that it further comprises an intermediate lens (8) which is arranged between the output diopter (16) of the primary optical element (6) and the projection lens (4), and which is configured so concentrating the radiation from the output diopter (16) of the primary optical element (8) on the projection lens (4).
    [2" id="c-fr-0002]
    2. Device (2) according to claim 1, characterized in that the output diopter (16) of the primary optical element (6) is generally spherical, and the means for forming pixels comprise at least one light guide ( 14) having a rectangular profile transverse to the lighting direction of the device (2).
    [3" id="c-fr-0003]
    3. Device (2) according to one of claims 1 to 2, characterized in that in the normal mounting direction the intermediate lens (8) comprises an input diopter (18) with a convex profile in a horizontal plane, and possibly a concave profile in a vertical plane.
    [4" id="c-fr-0004]
    4. Device (2) according to one of claims 1 to 3, characterized in that in the normal mounting direction the intermediate lens (8) comprises an exit diopter (20) with a convex profile in a vertical plane, and possibly along a horizontal plane.
    13/14
    [5" id="c-fr-0005]
    5. Device (2) according to one of claims 1 to 4, characterized in that in the normal mounting direction the intermediate lens (8) comprises a real focus and is higher than the projection lens (4), or the intermediate lens (8) has a virtual focus and is lower than the projection lens (4).
    [6" id="c-fr-0006]
    6. Device (2) according to one of claims 1 to 5, characterized in that the primary optical element (6) comprises several light guides (14), each intended to cooperate with a primary light source (12) , the device (2) being configured so as to project several light pixels (34), in particular several parallel light bands, which each correspond to one of the primary light sources (12).
    [7" id="c-fr-0007]
    7. Device (2) according to claim 6, characterized in that it comprises at least one primary light source (12), in particular a light-emitting diode and / or a laser, each source being associated with a light guide (14 ).
    [8" id="c-fr-0008]
    8. Device (2) according to one of claims 1 to 7, characterized in that along a vertical plane in the normal mounting direction, the projection lens (4) comprises an input diopter (22) with a profile concave or plane and an exit diopter (24) with a convex profile.
    [9" id="c-fr-0009]
    9. Device (2) according to one of claims 1 to 8, characterized in that along a vertical plane in the normal mounting direction, the projection lens (4) has a divergent lens profile.
    [10" id="c-fr-0010]
    10. Device (2) according to one of claims 1 to 9, characterized in that it comprises several primary optical elements (6) and several intermediate lenses (4), each associated with a primary optical element (6) and arranged between the projection lens (4) and an associated primary optical element, the projection lens having a continuous output diopter along the intermediate lenses (8).
    [11" id="c-fr-0011]
    11. Device (2) according to claim 10, characterized in that along a horizontal plane in the normal mounting direction, the combination of a primary optical element (6) and an intermediate lens (8) forms a module with an axis
    14/14 optical (32), the device (2) comprises at least three consecutive modules whose optical axes (32) are inclined relative to the normal (30) at the output diopter (24) of the projection lens (4 ), respectively, of an angle β between -2 ° and -10 °, of an angle β equal to 0 °, of an angle β between 2 ° and 10 °.
    [12" id="c-fr-0012]
    12. Device (2) according to claim 10, characterized in that along a horizontal plane in the normal mounting direction, the combination of a primary optical element (6) and an intermediate lens (8) forms a module with an optical axis (32), the device (2) comprises at least three consecutive modules whose optical axes (32) are inclined relative to the normal (30) at the output diopter (24) of the projection lens (4 ), respectively, by an angle β equal to 0 °, by an angle β between 2 ° and 10 °, and by an angle β between 5 ° and 18 °.
    [13" id="c-fr-0013]
    13. Device (2) according to one of claims 10 to 12, characterized in that it comprises at least three primary optical elements (6) each provided with means for forming (14) of pixels, along a horizontal plane in the normal direction of mounting the output diopter (24) of the projection lens (4) has a convex curvature with a radius of curvature less than 400 mm, preferably less than or equal to 150 mm.
    [14" id="c-fr-0014]
    14. Device (2) according to one of claims 1 to 13, characterized in that along a horizontal plane in the normal mounting direction, the output diopter (24) of the projection lens (4) has a curvature, the thickness of the projection lens (4) decreases in the opposite direction to the direction of projection.
    [15" id="c-fr-0015]
    15. Device (2) according to one of claims 1 to 14, characterized in that according to a horizontal plane in the normal mounting direction, the inclination a between the normal (30) at the output diopter (24) of the projection lens (4) and the direction of projection increases towards at least one end of the projection lens (4).
    [16" id="c-fr-0016]
    16. Optical unit for a motor vehicle headlamp comprising a strip lighting device, characterized in that said device (2) conforms to one of claims 1 to 15.
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP2743567A1|2012-12-14|2014-06-18|Valeo Vision|Primary optical element, lighting module and headlight for motor vehicle|
    EP2871406A1|2013-11-07|2015-05-13|Valeo Vision|Primary optical element, lighting module and headlight for motor vehicle|
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    法律状态:
    2017-09-29| PLFP| Fee payment|Year of fee payment: 2 |
    2018-03-30| PLSC| Publication of the preliminary search report|Effective date: 20180330 |
    2018-09-28| PLFP| Fee payment|Year of fee payment: 3 |
    2019-09-30| PLFP| Fee payment|Year of fee payment: 4 |
    2020-09-30| PLFP| Fee payment|Year of fee payment: 5 |
    2021-09-30| PLFP| Fee payment|Year of fee payment: 6 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1659375A|FR3056693B1|2016-09-29|2016-09-29|STRIP LIGHTING DEVICE FOR MOTOR VEHICLE PROJECTOR|
    FR1659375|2016-09-29|FR1659375A| FR3056693B1|2016-09-29|2016-09-29|STRIP LIGHTING DEVICE FOR MOTOR VEHICLE PROJECTOR|
    EP17192634.8A| EP3301348B1|2016-09-29|2017-09-22|Lighting device in strips for motor vehicle headlight|
    JP2017187967A| JP7019359B2|2016-09-29|2017-09-28|Lighting equipment that produces striped split beams for automotive headlamps|
    CN201710903202.0A| CN107883335B|2016-09-29|2017-09-28|Lighting device for a motor vehicle headlight for producing a strip-shaped segmented beam|
    US15/720,350| US10724700B2|2016-09-29|2017-09-29|Lighting device generating stripe segmented beam for a motor-vehicle headlamp|
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