EP3870894B1 - Unité d'éclairage pour un phare de véhicule automobile - Google Patents

Unité d'éclairage pour un phare de véhicule automobile Download PDF

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Publication number
EP3870894B1
EP3870894B1 EP19773113.6A EP19773113A EP3870894B1 EP 3870894 B1 EP3870894 B1 EP 3870894B1 EP 19773113 A EP19773113 A EP 19773113A EP 3870894 B1 EP3870894 B1 EP 3870894B1
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EP
European Patent Office
Prior art keywords
light
prism
lamp unit
diaphragm
unit according
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.)
Active
Application number
EP19773113.6A
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German (de)
English (en)
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EP3870894A1 (fr
Inventor
Josef Hechenberger
Bernhard Mandl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZKW Group GmbH
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ZKW Group GmbH
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Publication of EP3870894A1 publication Critical patent/EP3870894A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/26—Elongated lenses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • 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
    • F21W2102/16—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 blurred cut-off lines
    • 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
    • F21W2102/17—Arrangement or contour of the emitted light for regions other than high beam or low beam
    • F21W2102/18—Arrangement or contour of the emitted light for regions other than high beam or low beam for overhead signs

Definitions

  • the invention relates to a lighting unit for a lighting device of a motor vehicle, in particular for a motor vehicle headlight, comprising: at least one low beam module for generating a low beam light distribution largely below a horizontal light-dark boundary depicted essentially in front of the motor vehicle, at least one high beam module for generating a high beam - Light distribution largely above the cut-off line, imaging optics downstream of the low-beam module and the high-beam module in the optical beam direction to generate an overall light distribution of the light modules with an optical axis and a focal surface oriented essentially normal to the optical axis, and a screen that has a screen edge has and extends to generate the horizontal light-dark boundary in a light image generated by the lighting unit substantially to the focal surface of the imaging optics.
  • Lighting devices and light modules for motor vehicles which are set up to generate different light distributions and light-dark boundaries by means of appropriate control and to project them onto the road, are well known. According to a well-known principle, these different light distributions and light-dark boundaries are suppressed by means of a beam shield, with which a part of the emitted light beams is blanked out in a targeted manner.
  • a beam shield By means of the aperture, among other things, a sharp cut-off between light and dark can be obtained in a light image generated by the low-beam function, so that blinding of preceding or oncoming road users is largely avoided.
  • Luminous units according to the structure mentioned at the outset are well known.
  • the low beam module which is arranged on top in the motor vehicle when installed
  • the high beam module which is arranged on the underside in the motor vehicle when installed, interact via the common screen body and the common imaging optics, so that the imaging optics images the intermediate light images of both the low beam module and the high beam module and the screen images the beam paths of both modules affected.
  • Lighting units of this type generally have the disadvantage in common that they do not intentionally mix or overlap the light beams of the light beams attached on the top allow the low beam module and the high beam module mounted on the underside.
  • the critical area is here in that edge area of the beam diaphragm, which is in particular in the center and is formed along the focal curve of the imaging optics (e.g. projection lens).
  • a lighting unit for a lighting device of a motor vehicle in particular for a motor vehicle headlight, of the type mentioned at the outset in that the screen has a substantially flat, opaque screen area and, on the screen edge in the area of the focal surface, a light-transmissive screen area with a geometric structure made of a transparent material, wherein the geometric structure comprises at least one prismatic body with an essentially triangular cross-sectional area, the at least one prismatic body extends longitudinally and the longitudinal extent runs essentially transversely to the optical axis, the at least one prismatic body has a first, a second and a third prismatic surface , wherein the first prism surface is substantially aligned with the planar opaque panel area, the second prism surface faces the opaque panel area and with the first prism surface encloses an interior angle ⁇ 1 ⁇ ⁇ , and the third prism surface faces away from the opaque diaphragm area and encloses an interior angle ⁇ 2 ⁇ ⁇ with the first prism surface, where
  • the light beams generated by the low beam module are totally reflected by the prism structure on the screen edge in the area of the apron, so that the generation of disturbing scattered light in the area above the HH line is prevented, whereas those light beams generated by the high beam module pass through the prism structure in a transmissive manner and are deflected at this prism structure in such a way that the dark gap between the low beam and the high beam in the light image is closed when the high beam function is switched on (see also 7 , in which the beam paths are shown schematically, as well as a description of this).
  • the problem related to the burning glass effect is solved, since thanks to the transparent aperture area, which includes the geometric prism structure, the light rays, eg sunlight, are no longer absorbed, but penetrate the material and diverge.
  • the light beams that are totally reflected by the prism structure and that are generated by the low-beam module are refracted, resulting in a softer transition or a desired gradient generated at the light-dark boundary. This means that no further measures, such as a microstructure on the imaging optics, need to be taken in order to produce a desired gradient to soften the light-dark boundary.
  • the invention thus solves several current lighting problems of lighting units that have a low-beam module, a high-beam module and a beam shield for generating a horizontal light-dark boundary.
  • the diaphragm which has an essentially flat appearance, can lie essentially horizontally in the optical axis or be slightly inclined relative to the optical axis, in a manner known per se.
  • the screen can also have a kink along a horizontal line, so that the screen body does not have a continuous flat boundary surface.
  • the geometric structure may comprise a single large prism or two or more smaller prisms, the large prism or the two or more smaller prisms having to comply with the technical characteristics in terms of arrangement and internal angles defined above or in claim 1 (see also 9 and description of it). It was found that geometric structures other than the prism structure defined herein, for example a wedge shape with an internal angle ⁇ 1 or an internal angle ⁇ 2 of 45°, do not bring the desired advantages and, for example, total reflection also for the high beam or an undesired transmission of the low beams bring yourself
  • the heights of the lined-up prisms can increase steadily, which has the advantage that a smaller triangular prism that is closer to the focal point shades proportionately fewer high-beam light rays that are emitted by the first prism surfaces triangular prisms enter the transparent geometric structure of the aperture. For example, fewer high-beam rays are totally reflected at a second prism face of a smaller height prism closer to the focal point than enter via a first prism face of a triangular prism of greater height.
  • the increase in the heights of the triangular prisms advantageously follows a parabolic curve.
  • Imaging optics for headlights are well known per se to those skilled in the art.
  • the imaging optics can be constructed in a manner known per se and can comprise, for example, a projection lens or a multi-stage lens system; furthermore, lens-reflector combinations are also possible.
  • the geometric structure comprises at least two prismatic bodies arranged one behind the other in the optical beam direction, the first prismatic surfaces of which adjoin one another longitudinally and are aligned with one another.
  • the geometric structure is preferably formed from exactly two prismatic bodies arranged one behind the other in the optical beam direction, the first prismatic surfaces of which adjoin one another longitudinally and are aligned with one another; Due to the necessary geometric dimensions with regard to the prism surface and the basic thickness of the diaphragm, a geometric structure with exactly two prismatic bodies arranged in the optical direction of the beam has proven to be particularly advantageous because, on the one hand, the above-mentioned technical problems to be solved due to the distance of the geometric structure to the focal surface or .to the focal point of the imaging optics can be optimally solved, and this variant is also technically easy to implement.
  • the at least one prism body has two areas that merge into one another in the longitudinal direction, which are offset in height from one another and are connected to one another via a preferably inclined transition area through which the optical axis runs. This makes it possible to achieve an increase in asymmetry in the light distribution (see Fig.10 and description of it).
  • the opaque panel area can at least partially have a reflective surface.
  • the screen is made in one piece from the light-transmitting material and the opaque screen area is vaporized in a manner known per se, e.g. vaporized with a metal such as aluminum, or is mirrored.
  • the opaque panel area is made of an opaque material (e.g. metal or opaque plastic) and the translucent panel area, which encompasses the geometric structure, is an insert made of the translucent material (e.g. glass or translucent/transparent plastic), or the panel is made of a a multi-component injection molding process using transparent and opaque plastic materials, e.g. by a two-component injection molding process using an opaque and a transparent plastic material.
  • an opaque material e.g. metal or opaque plastic
  • the translucent panel area which encompasses the geometric structure
  • the translucent material e.g. glass or translucent/transparent plastic
  • the panel is made of a multi-component injection molding process using transparent and opaque plastic materials, e.g. by a two-component injection molding process using an opaque and a transparent plastic material.
  • the transparent material is preferably plastic or glass.
  • the second and/or third prismatic surface is designed to be essentially planar.
  • the second and/or third prism surface is curved, preferably the third prism surface is curved inwards.
  • These variants have the advantage that the gradient of the light-dark boundary can also be positively influenced, so that a smooth transition of the light-dark boundary can be realized (see also 11 and 12 as well as a description of this).
  • the cross-sectional area of the at least one prismatic body remains the same in the longitudinal extent.
  • the cross-sectional area of the at least one prism body increases in the longitudinal extension; in this way, the gradient of the light-dark boundary towards the edge areas of the light distribution is further softened, so that the roadsides can be illuminated in a particularly pleasant manner for the motor vehicle driver.
  • the at least one low-beam module and the at least one high-beam module each comprise at least one light source, with each light source being assigned a collimator in the optical beam direction and the collimator being set up to reduce the beam angle of the light beams generated by the light source and thereby increase the beam characteristics design.
  • the lighting unit can be a collimator module, for example, which comprises the at least one low-beam module and the at least one high-beam module, and wherein the low-beam and high-beam modules are assigned a plurality of light sources and a collimator is connected downstream of each light source in the optical beam direction.
  • the aperture is located downstream of the collimator module in the optical beam direction.
  • a projection lens or a multi-stage lens system can be provided as imaging optics.
  • the collimator can be designed, for example, as a TIR collimator lens (TIR—Total Internal Reflection).
  • TIR collimator lenses are well known to a person skilled in the art (e.g. TIR lens Bern from Auer Lighting GmbH, DE); these are optically transparent bodies made of a transparent material with a refractive index greater than that of air, e.g. glass or plastic; In doing so, essentially all of the light refracted on the light coupling-out surface of the TIR collimator lens spreads further through the air, preferably in a predetermined direction with a reduction in divergence compared to the light propagation in front of the light coupling-in surface.
  • the collimator is designed as a reflector, i.e. as a surface that reflects light (mainly visible) and deflects light rays propagating through the air in a preferably predetermined direction.
  • the components of the low-beam module and/or high-beam module that shape the light distribution can also be designed in the form of polyellipsoid reflector arrangements based on the projection headlight type, as is well known to those skilled in the art.
  • the screen has at least one light window, with at least one light path running outwards from the low beam and/or high beam modules through the at least one light window and through the imaging optics.
  • the at least one light window can be arranged in the opaque screen area of the screen and delimited by it, with the light window being designed as a recess in the opaque screen area of the screen or consisting of a light-transmitting material.
  • a further subject of the invention is a motor vehicle headlight which comprises at least one lighting unit according to the invention.
  • the motor vehicle headlight is a headlight.
  • the motor vehicle headlight according to the invention is expediently constructed according to headlight construction principles which are known per se and comprises a housing with a light exit opening which is covered by a lens or a cover plate.
  • Modern motor vehicle headlights often have a number of light modules which, taken individually or in combination, can take on individual light functions. These light modules are often arranged in close proximity to one another in the headlight housing.
  • the motor vehicle headlight according to the invention can therefore also include other light modules, e.g such as the light distribution of a daytime running light, a turn signal light, etc.
  • Another object of the invention is a motor vehicle comprising at least one lighting unit according to the invention and/or a motor vehicle headlight according to the invention.
  • the term "motor vehicle” (motor vehicle) as used herein refers to single or multi-track motorized land vehicles such as motorcycles, cars, trucks and the like.
  • Lighting unit 100 comprises a low-beam module 101, a high-beam module 102 and imaging optics in the form of a projection lens 103 with an optical axis 104 and one essentially normal to the optical axis 104, which are connected downstream of the low-beam module 101 and the high-beam module 102 to generate an overall light distribution of the light module in the optical beam direction oriented focal surface 116, also known as the Petzval surface.
  • the low-beam module 101 is set up to generate a low-beam light distribution for the most part below a horizontal light-dark boundary that is imaged essentially in front of the motor vehicle.
  • the high-beam module 102 is set up to generate a high-beam light distribution largely above the cut-off line.
  • the lighting unit includes 100 an essentially horizontal diaphragm 105, which has a diaphragm edge 106 and extends to generate the horizontal light-dark boundary in a light image generated by the lighting unit 100 essentially up to the focal surface 116 of the downstream projection lens 103.
  • the aperture edge 106 reaches up to the focal surface 116 or up to the focal point F of the projection lens 103 .
  • the low beam module 101 and the high beam module 102 together form a collimator module that is constructed according to generally known principles and does not need to be explained in more detail at this point (see also the description of collimators, eg TIR collimator lenses, above).
  • the low-beam module 101 and the high-beam module 102 each comprise a plurality of light sources, not shown in detail, for example embodied as LEDs, each light source being assigned a collimator, also not shown in detail, in the optical beam direction.
  • Each collimator is designed to reduce the divergence of the light rays generated by the light source.
  • the collimator module includes other optical components such as lenses or reflectors.
  • the low-beam module 101 and the high-beam module 102 can also be constructed according to other construction principles and are not limited to the 1 and 2 collimator structure shown schematically limited.
  • the low-beam module and/or the high-beam module can have reflectors based on the classic PES (poly-ellipsoid system) headlight type that is well known in the art.
  • the features of the lighting unit 100 according to the invention can be found in the panel 105, which is described in more detail in the following figures.
  • FIG. 3 shows the aperture 105 of the Figures 1 and 2 illustrated lighting unit 100 in a perspective view
  • 4 shows a plan view of the panel 105
  • figure 5 shows a section through aperture 105
  • 6 shows the geometric prismatic structure of the aperture of in Figures 1 and 2 illustrated lighting unit in detail.
  • the panel 105 has an essentially flat, opaque panel area 107 and on the panel edge 106 in the area of the focal surface 116 a light-transmitting panel area 108 with a geometric structure 109 made of a light-transmitting material. It goes without saying that the opaque screen area 107 can have a reflective surface, at least in part.
  • the opaque screen area 107 is made of metal and the light-permeable screen area 108 comprising the geometric structure 109 is an insert made of the light-permeable material.
  • the screen 105 in one piece from the light-transmitting material and the opaque screen area 107 is vapour-deposited in a manner known per se, e.g. with a metal such as aluminum, with the light-transmissive screen area 108 being recessed and therefore not being vapor-coated.
  • the translucent material is plastic. Instead of plastic, glass can also be chosen as the opaque material.
  • the geometric structure 109 of the exemplary aperture 105 comprises two prism bodies 110, each with a substantially triangular cross-sectional area.
  • Each prismatic body 110 extends longitudinally and the longitudinal extent runs essentially transversely to the optical axis 104.
  • Each prismatic body has a first, a second and a third prismatic surface, with the first prismatic surface 111 being essentially aligned with the flat, opaque screen area 107, and the second prismatic surface 112 faces the opaque diaphragm area 107 and encloses an interior angle ⁇ 1 ⁇ ⁇ with the first prism surface 111, and the third prism surface 113 faces away from the opaque diaphragm area 107 and encloses an interior angle ⁇ 2 ⁇ ⁇ with the first prism surface 111, where ⁇ is the critical angle of total internal reflection of the light-transmitting material, the interior angles ⁇ 1 and ⁇ 2 are the same or different, and provided that the interior angle ⁇ 1 and the interior angle ⁇ 2 are not 45°,
  • FIG. 7 illustrates the beam path of the light beams emitted by the low beam module or the high beam module, through one of the two prism bodies 110 of the screen 105 used according to the invention.
  • the light beams 114 generated by the low beam module 101 enter the prism body 110 through the second prism surface 112 and are first prismatic surface 111 is totally reflected and exits through the third prismatic surface 113, so that the generation of interfering scattered light in the area above the HH line is suppressed.
  • the light beams 117 generated by the high beam module 102 enter through the first prism surface 111, are transmitted through the prism body and are slightly deflected when exiting through the third prism surface 113, so that the gap between the low beam and the high beam in the light image of the high beam function (ie low beam and high beam are switched on) is closed.
  • the diaphragm 105 has a light window 115 which is arranged in the opaque diaphragm area 107 of the diaphragm 105 and is delimited by this.
  • the light window 115 is created by closing a window-shaped recess in the opaque panel area 107 with an insert plate made of transparent plastic.
  • the light path from the low and/or high beam modules may be through the light window 115 and out through the projection lens.
  • the light path through the light window 115 runs exclusively from the low beam module 101 through the light window 115 and through the imaging optics 101 to the outside. This is in 8 shown, which is a detailed view of a section through the aperture in 1 and 2 represents and the beam path of the light beams 114, which are emitted by the low beam module 101, through the aperture 105 arranged in the light window 115 ("sign light”) illustrates.
  • Figure 8a shows an enlarged view of the 8 , wherein the optical path of the light beams 117, which are emitted by the high-beam module 102, is also shown.
  • the light beams 117 from the high-beam module are totally reflected at the lower boundary surface 118 of the light window 115, which is inclined relative to the optical axis 104 (in Figure 8a the totally reflected light rays are marked with 117*).
  • the light rays 117 to the perpendicular n on the boundary surface 118 have an angle of incidence greater than the angle of total reflection.
  • triangular prisms 210 or 310 are each arranged in the translucent area on the diaphragm edge of a diaphragm used according to the invention and in relation to the focal surface or focal point F of the imaging optics (e.g. a projection lens 103 1 and 2 ) positioned in the lighting unit according to the invention.
  • imaging optics e.g. a projection lens 103 1 and 2
  • the triangular prisms 210 or 310 each comprise a first prism surface 211 or 311, a second prism surface 212 or 312 and a third prism surface 213 or 313. As in 9 is clearly visible, the respective first prism surface 211 or 311 of the triangular prisms 210 or 310 runs essentially parallel to the optical axis 204.
  • the second prism faces 312 of the five small triangular prisms 310 are parallel to the second prism face 212 of the large triangular prism 210; the third prism faces 313 of the small triangular prisms 310 lie parallel to the third prism face 213 of the large triangular prism 210.
  • the diaphragm edge 206 or 306 is defined by the prism edge formed from prism faces 211 and 213 or 311 and 313 (in the case of the small triangular prisms 310 by the outermost , the imaging optics nearest prism 310). In 9 the diaphragm edge 206 or 306 extends exactly up to the focal point F of the imaging optics/projection lens.
  • the small dirt prisms 310 shown all have the same height H'.
  • H' the height of the arrayed prisms
  • a smaller triangular prism that is closer to the focal point shades proportionately fewer high beams that enter the transparent geometric structure of the diaphragm through the first prism surfaces of the triangular prisms.
  • fewer high-beam rays are totally reflected at a second prism face of a smaller height prism closer to the focal point than enter via a first prism face of a triangular prism of greater height.
  • the increase in the heights of the triangular prisms advantageously follows a parabolic curve.
  • the panel 405 is constructed essentially like the panel 105 described above.
  • the panel 405 has an essentially flat, opaque panel area 407 and, on the panel edge 406 in the area of the focal surface, a transparent panel area 408 with a geometric structure 409 comprising two prismatic bodies 410 made of a transparent material.
  • the prism body 410 have in the longitudinal direction, two regions 410a and 410b that merge into one another, which are offset in height from one another and are connected to one another via an inclined transition region 410c, through which the optical axis 404 runs.
  • the opaque area 407 also comprises two areas 407a and 407b which merge into one another and are offset in height relative to one another and are connected to one another via an inclined transition area 407c through which the optical axis 404 runs. This makes it possible to realize an increase in asymmetry in the light distribution.
  • prism bodies 410 include first, second, and third prism faces (in 10 not provided with reference numbers for reasons of space), the second prism surface faces the opaque diaphragm area 407 and encloses an interior angle ⁇ 1 ⁇ ⁇ with the first prism surface, and the third prism surface faces away from the opaque diaphragm area 407 and encloses an interior angle with the first prism surface ⁇ 2 ⁇ ⁇ , where ⁇ is the critical angle of total reflection of the light-transmitting material, the interior angles ⁇ 1 and ⁇ 2 are the same or different, and provided that the interior angle ⁇ 1 and the interior angle ⁇ 2 are not 45°, respectively.
  • the screen 405 can of course also be provided with a light window 115 for generating a "sign light" function.
  • FIG 11 illustrates a gradient design for softening the light-dark boundary in a low beam distribution with the aid of a screen used according to the invention, which has a prismatic body with curved prismatic surfaces.
  • 12 shows an exemplary light distribution with a light-dark boundary in a two-dimensional angle space based on the lines HH and VV in a gradient configuration according to FIG 11 .
  • One advantage of the invention is that the light beams that are totally reflected on the prism structure and are emitted by the low beam module are refracted in slightly different directions, so that a softer transition or a legally compliant gradient value of the light-dark boundary is generated, with the light-dark boundary is primarily determined by the aperture edge 506 .
  • a third prism surface 513 is a prism body 510 is curved inward, the cross-sectional area being constant in the longitudinal extension.
  • the prismatic body 510 is a component of a screen used according to the invention, which is not shown in detail here, however.
  • a curved third prism surface 513 (and/or a curved second prism surface 512 ) has the advantage that the gradient of the light-dark boundary can be set in a particularly targeted manner and positively influenced, so that the light-dark boundary is split and is shown more broadly. For an observer or the vehicle driver, this results in a particularly soft transition of the light-dark boundary in the light image.
  • the light path of the light beams 516 emitted by the low beam module from the curved third prism surface 513 to the passage through a projection lens 503 is in 11 illustrated by arrows.
  • An exemplary bundle of parallel rays 516 experiences a diverging total reflection bundle of rays 516′ due to different surface normals on the curved third prism surface 513.
  • the divergence ⁇ is further increased by the projection lens 503 due to the different refraction of the light distribution beam 516".
  • the first prism surface 511 leaves the prism body 510 via the curved third prism surface 513.
  • Light is refracted at the two prism surfaces 512 and 513 according to Snell's law of refraction 12 it can be seen that the light-dark boundary HDG, which runs slightly below and parallel to the HH line, is widened wider, causing the gradient to decrease.
  • the invention can be modified in any manner known to those skilled in the art and is not limited to the embodiments shown. Individual aspects of the invention can also be taken up and largely combined with one another. Essential are the ideas on which the invention is based, which, in view of this teaching, can be carried out in a variety of ways by a person skilled in the art and are nevertheless maintained as such, the subject matter of the invention being defined by the appended claims.

Claims (15)

  1. Unité d'éclairage (100) pour un projecteur de véhicule automobile, comprenant :
    au moins un module de feu de croisement (101) pour produire une répartition de la lumière de croisement qui est principalement au-dessous d'une coupure clair-obscur horizontale représentée essentiellement devant le véhicule automobile,
    au moins un module de feux de route (102) pour produire une répartition de la lumière de feux de route qui est principalement au-dessus de la coupure clair-obscur,
    une optique de reproduction (103, 503) placée en aval du module de feux de croisement (101) et du module de feux de route (102) dans la direction optique du faisceau pour produire une répartition globale de la lumière des modules d'éclairage, avec un axe optique (104, 204, 404, 504) et une surface focale (116) orientée sensiblement perpendiculairement à l'axe optique (104, 204, 404, 504), et
    un diaphragme (105, 405) qui présente une limite de diaphragme (106, 206, 306, 506) et qui s'étend sensiblement jusqu'à la surface focale (116) de l'optique de reproduction (103, 503) pour produire la coupure clair-obscur horizontale dans une image lumineuse générée par l'unité d'éclairage (100),
    caractérisé en ce que
    le diaphragme (105, 405) présente une zone opaque de diaphragme (107, 407) essentiellement plane et une zone transparente de diaphragme à la limite du diaphragme (106, 206, 306, 506) dans la zone de la surface focale (116), (108, 408) ayant une structure géométrique (109, 409) en un matériau transparent, la structure géométrique (109, 409) comportant au moins un corps prismatique (110, 210, 310, 410, 510) ayant une surface de section transversale sensiblement triangulaire, ledit au moins un corps de prisme (110, 210, 310, 410, 510) étant allongé et l'extension longitudinale étant sensiblement transversale à l'axe optique (104, 204, 404, 504), ledit au moins un corps de prisme (110, 210, 310, 410, 510) ayant une première, une deuxième et une troisième surface de prisme, la première surface de prisme (111, 211, 311, 511) étant sensiblement alignée avec la zone opaque de diaphragme (107, 407) plane, la deuxième surface de prisme (112, 212, 312, 512) étant tournée vers la zone opaque de diaphragme (107, 407) en formant un angle intérieur α1 ≥ θ avec la première surface de prisme (111, 211, 311), et la troisième surface de prisme (113, 213, 313, 513) étant opposée à la zone opaque de diaphragme (107, 407) en formant un angle interne α2 ≥ θ avec la première surface de prisme (111, 211, 311), où θ est l'angle limite de réflexion totale du matériau transmettant la lumière, les angles internes α1 et α2 étant identiques ou différents, et à condition que l'angle interne α1 ou l'angle interne α2 n'étant pas 45°.
  2. Unité d'éclairage selon la revendication 1, caractérisée en ce que la structure géométrique (109, 409) comprend au moins deux corps prismatiques (110, 310, 410) disposés l'un derrière l'autre dans la direction du faisceau optique, les premières surfaces prismatiques (111, 311) desdits corps prismatiques étant adjacentes l'une à l'autre dans le sens de la longueur et alignées l'une avec l'autre.
  3. Unité d'éclairage selon la revendication 2, caractérisée en ce que la structure géométrique (109, 409) est formée d'exactement deux corps prismatiques (110, 410) disposés l'un derrière l'autre dans la direction du faisceau optique, les premières surfaces prismatiques (111) desdits corps prismatiques étant adjacentes l'une à l'autre dans le sens de la longueur et alignées l'une avec l'autre.
  4. Unité d'éclairage selon l'une quelconque des revendications 1 à 3, caractérisée en ce que ledit au moins un corps prismatique (410) présente, dans la direction longitudinale, deux zones (410a, 410b) qui se fondent l'une dans l'autre, qui sont décalées en hauteur l'une par rapport à l'autre et qui sont reliées l'une à l'autre par une zone de transition (410c), de préférence oblique, à travers laquelle passe l'axe optique (404).
  5. Unité d'éclairage selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le diaphragme est fabriqué monobloc à partir du matériau transparent et en ce que la zone opaque de diaphragme est métallisée, en particulier métallisée, ou réfléchie.
  6. Unité d'éclairage selon l'une quelconque des revendications 1 à 4, caractérisée en ce que la zone de diaphragme opaque est fabriquée à partir d'un matériau opaque et la zone de diaphragme translucide comprenant la structure géométrique est une pièce d'insertion fabriquée à partir du matériau translucide, ou le diaphragme est fabriqué au moyen d'un procédé de moulage par injection à plusieurs composants utilisant des matériaux plastiques translucides et opaques.
  7. Unité d'éclairage selon l'une quelconque des revendications 1 à 6, caractérisée en ce que le matériau translucide est du plastique ou du verre.
  8. Unité d'éclairage selon l'une quelconque des revendications 1 à 7, caractérisée en ce que la deuxième et/ou la troisième surface prismatique (112, 113, 212, 213, 312, 313) est sensiblement plane.
  9. Unité d'éclairage selon l'une quelconque des revendications 1 à 7, caractérisée en ce que la deuxième et/ou la troisième surface prismatique (512, 513) est incurvée, de préférence la troisième surface prismatique (513) est incurvée vers l'intérieur.
  10. Unité d'éclairage selon l'une quelconque des revendications 1 à 8, caractérisée en ce que ledit au moins un module de feux de croisement (101) et ledit au moins un module de feux de route (102) comprennent chacun au moins une source lumineuse, un collimateur respectif étant associé à chaque source lumineuse dans la direction du faisceau optique et le collimateur étant agencé pour réduire l'angle de rayonnement des rayons lumineux générés par la source lumineuse.
  11. Unité d'éclairage selon l'une quelconque des revendications 1 à 10, caractérisée en ce que le diaphragme (101) comprend au moins une fenêtre de lumière (115), au moins un chemin lumineux s'étendant vers l'extérieur à partir des modules de feux de croisement et/ou de feux de route (101, 102) à travers ladite au moins une fenêtre de lumière (115) et à travers l'optique d'imagerie (103).
  12. Unité d'éclairage selon la revendication 11, caractérisée en ce que l'au moins un trajet lumineux à travers ladite au moins une fenêtre d'éclairage (115) s'étend exclusivement du module de feux de croisement (101) vers l'extérieur à travers l'au moins une fenêtre d'éclairage (115) et à travers l'optique d'imagerie (103).
  13. Unité d'éclairage selon la revendication 11 ou 12, caractérisée en ce que ladite au moins une fenêtre d'éclairage (115) est disposée dans la zone opaque de diaphragme (107) du diaphragme (105) et est délimitée par celle-ci, la fenêtre d'éclairage (107) étant réalisée sous forme d'évidement dans la zone opaque de diaphragme ou étant constituée d'un matériau translucide.
  14. Projecteur de véhicule automobile comprenant au moins une unité d'éclairage (100) selon l'une quelconque des revendications 1 à 13.
  15. Véhicule automobile comprenant au moins une unité d'éclairage (100) selon l'une quelconque des revendications 1 à 13 et/ou un projecteur de véhicule automobile selon la revendication 14.
EP19773113.6A 2018-10-25 2019-09-26 Unité d'éclairage pour un phare de véhicule automobile Active EP3870894B1 (fr)

Applications Claiming Priority (2)

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EP18202516.3A EP3643962A1 (fr) 2018-10-25 2018-10-25 Unité d'éclairage pour un phare de véhicule automobile
PCT/EP2019/076020 WO2020083601A1 (fr) 2018-10-25 2019-09-26 Unité d'éclairage pour projecteur de véhicule automobile

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CN (1) CN112912667B (fr)
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EP3870894A1 (fr) 2021-09-01
JP2022512814A (ja) 2022-02-07
JP7231726B2 (ja) 2023-03-01
US20210388960A1 (en) 2021-12-16
EP3643962A1 (fr) 2020-04-29
KR102530959B1 (ko) 2023-05-10
CN112912667A (zh) 2021-06-04
WO2020083601A1 (fr) 2020-04-30
US11293612B2 (en) 2022-04-05
CN112912667B (zh) 2023-01-03
KR20210060575A (ko) 2021-05-26

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