EP3830473B1 - Phare de véhicule automobile à réflecteur ellipsoïde et collimateur - Google Patents

Phare de véhicule automobile à réflecteur ellipsoïde et collimateur Download PDF

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Publication number
EP3830473B1
EP3830473B1 EP19755297.9A EP19755297A EP3830473B1 EP 3830473 B1 EP3830473 B1 EP 3830473B1 EP 19755297 A EP19755297 A EP 19755297A EP 3830473 B1 EP3830473 B1 EP 3830473B1
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EP
European Patent Office
Prior art keywords
light
motor vehicle
collimator
reflector
optical element
Prior art date
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Active
Application number
EP19755297.9A
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German (de)
English (en)
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EP3830473A1 (fr
Inventor
Florian Kronberger
Josef Hechenberger
Stephan Arlinghaus
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ZKW Group GmbH
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ZKW Group GmbH
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Publication of EP3830473A1 publication Critical patent/EP3830473A1/fr
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    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—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
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—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
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
    • F21V9/30—Elements containing photoluminescent material distinct from or spaced from the light source
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/30—Semiconductor lasers

Definitions

  • the invention relates to a motor vehicle headlight.
  • the desire to be able to project a light image onto the road is becoming more and more important, with the efficiency of light generation being essential for the quality and cost-effectiveness of a motor vehicle headlight.
  • Various headlights such as main headlights and additional headlights, are used for this purpose, which produce different light patterns on the road.
  • the term "roadway" is used here for the sake of simplicity, because of course it depends on the local conditions whether a photograph is actually on the roadway or extends beyond it.
  • the light image in the sense used corresponds to a projection onto a vertical surface in accordance with the relevant standards that relate to vehicle lighting technology.
  • the headlight 10 of a conventional type generates a light distribution for a partial high beam function, for example.
  • the headlight includes a light source 11, which is in a (in 1 (symbolized by a circle) light module 12 is held and positioned, collimator optics 40, a diaphragm 50 and projection optics, which are embodied here as a single lens 60, for example.
  • the light emanating from the light source 11 is coupled into the collimator optics 40 at a collimator light entry surface 41 .
  • the collimator optics serves to focus the light and to let it exit through a collimator light exit surface 42 .
  • the collimator 40 is positioned so that the light source 12 is at the collimator entrance focus; the stop 50 is positioned with respect to the collimator 40 to be at the collimator exit focal length. A light image is thereby formed in the plane of the stop 50, and the stop is arranged to block out part of the light image.
  • Downstream of the aperture 50 in the beam path are projection optics 60 which are at a distance from the light image at the location of the aperture 50, this distance being the focal length (more precisely: input focal length) of the projection optics 60 corresponds.
  • the projection optics 60 are set up to project the light image in the emission direction of the motor vehicle headlight 10 and thus to generate a light distribution of the desired type on a projection surface (eg street).
  • pamphlet FR 3 038 695 discloses a lighting module with a light source and an ellipsoidal reflector, which bundles light emitted by the light source in a first focal point of the reflector to a second focal point of the reflector and lets it exit through a light exit opening of the reflector.
  • DE 10 2013 227 194 A1 describes a motor vehicle headlight with a reflector that is closed on one side and has an ellipsoid-like basic shape.
  • the light generated by light sources should be shaped as efficiently as possible, bundled and projected onto the roadway as a light image.
  • Lenses are often either too expensive or limiting due to their transmission properties.
  • Undesirable chromatic aberration can also occur in certain configurations.
  • Another significant problem is the accessibility of the light source for optical components, which is often difficult due to the structure of the light source and its supply components (electrical supply lines, cooling).
  • the heat generated in the light source especially if this is a laser light source, which causes other components of the headlamp, in particular a light-forming component such as collimator optics, which must be positioned close to the light source due to the required geometry of the optics, to be damaged by heating can take.
  • the optics element is set up to partially reflect or absorb the light beam bundle and partially let it pass.
  • a highly efficient light collection in a motor vehicle headlight can be designed with an ellipsoidal reflector, since the reflector surrounds the light source and thus a very large solid angle is available for the focal point or the light collection.
  • This can be advantageously combined in particular with the Lambertian radiation characteristic of a laser light source.
  • the ellipsoid reflector creates a virtual light source, namely in the second focal point, which virtual light source is geometrically more accessible to the optical system connected to the reflector, in particular the projection optics, than the actual light source.
  • Chromatic aberration is also avoided by using reflective components for the reflector and collimator.
  • the ellipsoidal reflector enables a spatial distance to be created between the light source and the collimator optics, thus alleviating the problem of heat development in the (laser) light source, since better heat dissipation is ensured without impairing the optical components.
  • This additional reflector also increases the contrast of the system.
  • Rotationally symmetric ellipsoidal reflectors have two conjugate foci. After being reflected, the light from one focal point passes through the other focal point. Due to the ellipsoidal design, it is possible to cover a much larger part of the whole emitted light, compared to spherical mirrors or conventional lens systems, which leads, among other things, to better light output and an increased brightness value at the maximum of the light distribution. In addition, there is a space-saving geometry that is well suited for the small installation space in a headlight.
  • the motor vehicle headlight according to the invention can be designed for light functions such as a high beam, a partial high beam, a low beam, but also for additional light functions or the like.
  • the arrangement according to the invention allows light beams to be efficiently bundled into a light beam bundle, with the light beam bundle being able to be shaped in a simple manner in accordance with specified standards and being projected in the emission direction of the motor vehicle headlight.
  • the bundling can be adapted particularly well to specific emission characteristics of certain light sources, such as semiconductor laser diodes.
  • a specifically adapted and correspondingly shaped reflector device with different dimensions or focal points of the ellipsoid can be used for each type of light source used.
  • the collimator does not lie directly on the light source, as is usual in the prior art.
  • the collimator is subjected to less thermal stress and it is therefore possible, for example, to use polymethyl methacrylate (PMMA) as the material for the collimator instead of the Tarflon (polycarbonate, PC) otherwise customary in the prior art.
  • PMMA is less expensive and absorbs less light because, unlike Tarflon (PC), it can be highly polished.
  • the arrangement according to the invention makes it possible to use a smaller collimator, as a result of which material can be saved.
  • the projection system fed from the reflector system includes a collimator, an optical element acting effectively as a diaphragm and projection optics, for example in the form of a projection lens, the focal planes of the collimator and the projection lens coinciding with the location of the diaphragm of the optical element.
  • This structure makes it possible to trim the light image generated by the collimator in the focal plane in a suitable manner with the aid of the optical element, ie to shade certain areas, in order then to image the light image cropped in this way with the projection optics.
  • the motor vehicle headlight in particular the optical element, has at least two edges which each run straight and are arranged in the beam path of the light beam so that a light-dark boundary can be generated for a low beam function of the motor vehicle headlight.
  • This allows the projected light distribution to be curtailed in a simple manner in accordance with relevant standards (e.g. SAE, ECE) for a low beam function.
  • the light source has at least one semiconductor light source, preferably at least one laser diode.
  • a particularly high efficiency of the motor vehicle headlight can be achieved by a combination of a laser light source with an ellipsoidal reflector.
  • the motor vehicle headlight also has a light conversion means, which is arranged in the beam path of the light beam and is set up, when excited by the light beam with a first wavelength range, to additionally stimulate at least one further light beam with a second wavelength range that differs from the first.
  • a light conversion means which is arranged in the beam path of the light beam and is set up, when excited by the light beam with a first wavelength range, to additionally stimulate at least one further light beam with a second wavelength range that differs from the first.
  • the ellipsoid reflector is designed as a reflector shell curved in accordance with an ellipsoid of revolution (to be precise, a partial shell thereof).
  • the light emitted by the light source can be shaped particularly effectively into a light beam of the desired type.
  • a particularly cost-effective embodiment results when the collimator is a TIR optic.
  • the collimator is formed by a converging lens with a spacing contour, the spacing contour defining a plane which is located in front of the collimator light entry surface in the collimator entry focal length.
  • the second focal point of the ellipsoid reflector is located in the plane of the distance contour, as a result of which it is possible to attach the ellipsoid reflector in a particularly simple manner.
  • the projection optics have at least one converging lens, as a result of which a cost-effective arrangement is created in a simple manner.
  • the optics element is a screen and the screen is set up to reflect or absorb a first part of the light beam on the optics element away from the projection optics and to allow a second part of the light beam to pass the at least one edge to the projection optics. This allows the light beam to be easily shaped according to the requirements of the desired projected light image.
  • the optical element is arranged in a substantially vertically oriented manner in an installation position of the headlight in a vehicle.
  • the optics element is designed in such a way that it contains a reflective component or is a reflector at all, and the component/reflector is set up to deflect a first part of the light beam bundle by means of reflection on a surface of the optics element to the projection optics , and a second part of the light beam at the at least one edge and at the Let projection optics pass.
  • the bundle of light rays can be shaped in a simple manner in accordance with the requirements of the desired, projected light image.
  • the surface of the optical element is oriented in an installation position of the headlight in a vehicle at an angle of inclination to the horizontal which is essentially in a range from 10° to 50°, preferably from 20° to 40° and particularly preferably 30°.
  • first image plane intersects with the second image plane in a straight line, in which straight line the at least one edge also lies.
  • a headlight contains many other parts that have not been mentioned and that enable it to be used in a motor vehicle, such as in particular a car or motorcycle, which are not explained further for the sake of clarity.
  • a headlight contains many other parts that are not shown and that allow sensible use in a motor vehicle, such as in particular a car or motorcycle.
  • cooling devices for components, control electronics, further optical elements, mechanical adjusting devices or holders are not shown.
  • orientations of components mentioned below relate to an installation position of the headlight in a motor vehicle. Of course, other arrangements with other installation positions are also possible.
  • FIGS. 2 and 4 show a first exemplary embodiment of a motor vehicle headlight 100, comprising a light source 110 which is set up to emit light.
  • the light source 110 is held in a light module 120 in a defined, optionally adjustable position.
  • the light distribution that can be generated is particularly suitable for a partial high beam function.
  • an ellipsoidal reflector 130 with a reflector light entry point 131, into which the emitted light is coupled, and a reflector light exit opening 132, the contour of which advantageously lies in a plane which, for example, is oriented essentially vertically in the exemplary embodiment shown.
  • the ellipsoidal reflector 130 is set up to deflect the light coupled in from the light source 110 in the direction of the reflector light exit opening 132 . At the same time the light becomes through the second The focal point of the reflector 130 is focused, thereby making it possible to shape it into a light beam.
  • the reflector light entry point is conveniently chosen so that it essentially coincides with the first focal point (focal point) of the ellipsoid. If the light source cannot be considered point-like, e.g. when using an area phosphor of a laser light source, it is usually convenient to position a brightest point of the area light source in the focal point.
  • a collimator 140 is preferably provided, which has a collimator light entry surface 141 and a collimator light exit surface 142 , as well as a collimator entry focal length 145 and a collimator exit focal length 146 .
  • a collimator entrance focus is at a distance of the collimator entrance focal length 145 from the center of the collimator light entrance surface 141
  • a collimator exit focus is at a distance of the collimator exit focal length 146 from (the center) of the collimator Light exit surface 142.
  • the collimator 140 can, as shown in the embodiment shown, also be set up to focus the incident light beam from the ellipsoidal reflector 130 and into the Directing direction of the first image plane 170. A light image is formed there, that is to say in the first image plane 170, with the aid of the collimator. For this purpose it is favorable if the second focal point of the reflector 130 is in the collimator entry focal point (entry focal length 145).
  • a projection optics 160 is located at a distance from the light image that corresponds to the focal length (more precisely: entrance focal length) 161 of the projection optics 160 .
  • the associated focal point of the input focal length 161 thus lies in a second image plane 180, which in this exemplary embodiment coincides with the first image plane 170.
  • the projection optics 160 are set up to project a light image generated by the light beam and located in the second image plane 180 in the emission direction of the motor vehicle headlight 100 .
  • first and second image planes 170, 180 intersect or overlap.
  • An optical element 150 with two optically active edges 151, 152 is arranged in the beam path of the light beam bundle between the collimator 140 and the projection optics 160.
  • the optics element 150 is a diaphragm. Aperture 150 is described in more detail below.
  • the optics element 150 is set up to delimit the light beam bundle with the aid of the at least one optically effective edge 151, 152, so that it partially reaches the projection optics 160, i.e. partially reflects or absorbs it and partially lets it pass, and the optics element 150 is arranged in such a way that the first and the second image plane 170, 180 lies on the optical element 150.
  • the two edges 151 and 152 ( 2 ) are straight and the edge 151 is oriented essentially horizontally in an installation position of the motor vehicle headlight in a vehicle, as prescribed by the approval regulations and standards.
  • the edges 151, 152 run at an angle to one another that is prescribed in accordance with the relevant standards (eg SAE or ECE).
  • SAE SAE
  • ECE ECE
  • three edges or even more edges may also be necessary in order to generate a desired contour in a projected light image. It can also be useful if the edges are freely formed, that is, they do not run straight.
  • the motor vehicle headlight can have two edges, which each run straight and are arranged in the beam path of the light beam bundle in such a way that a light-dark boundary can be generated for a low-beam function of the motor vehicle headlight.
  • the light source 110 has a semiconductor light source, which is preferably a laser diode.
  • the motor vehicle headlight 100 also has a light conversion means (not shown), which is arranged in the beam path of the light beam and is set up, when excited by the light beam with a first wavelength range, to additionally excite at least one further light beam with a second wavelength range that differs from the first .
  • This light conversion medium can be used to convert a non-visible light range into a visible light range, or to simply change the color of the light beam, for example by adding red and green spectral components by means of corresponding additional light beam bundles to a blue, originally exciting light beam bundle of a laser light beam, in order to add produce a white light beam. This aspect is not shown in the figures.
  • the light conversion means can be arranged, for example, directly on the emitting surface of a laser light source, or on a surface of an optical lens.
  • the ellipsoidal reflector 130 is a reflector in the form of a three-axis curved ellipsoid. However, the shape of the ellipsoidal reflector 130 can deviate from the ellipsoid at certain points, for example in order to allow for an adaptation of emission patterns of special light sources, which can lead to an improvement in the light yield.
  • the collimator 140 is formed by TIR optics (TIR lens).
  • TIR lens TIR optics
  • the light yield, starting from the ellipsoidal reflector 130, can be further increased.
  • other designs of the collimator are possible in design variants and can be useful depending on the application.
  • the collimator 140 is formed, for example, as a converging lens with a distance contour 143, the distance contour 143 defining a plane in which the collimator entrance focal point (entrance focal length 141) is located.
  • the distance contour 143 is preferably aligned in relation to the reflector light exit opening 132, for example in such a way that its plane coincides with that of the reflector light exit opening 132. This serves e.g. B. to easily align the input focus of the collimator with other parts of the headlight 100 during assembly of the headlight 100.
  • the distance contour 143 can rest on a holder which, for example, carries the ellipsoidal reflector 130, as a result of which the two optics 130 and 140 are adjusted relative to one another.
  • the spacing contour 143 is preferably ring-shaped and arranged concentrically to the optical axis of the collimator.
  • Other shapes of the spacer contour 143 adapted to specific mounts are also possible, such as a three-point support, through which an imaginary spacer contour runs, which defines a plane through which the reflector light exit opening 132 also runs in the mounted state.
  • the projection optics 160 are implemented by a converging lens, but can also include light-guiding elements, for example.
  • the optical element 150 is a diaphragm and is set up to reflect or absorb a first part of the light beam on the optical element 150 away from the projection optics 160 and to allow a second part of the light beam to pass at the edges 151, 152 to the projection optics 160.
  • the screen 150 can be designed to be reflective or absorbing.
  • an absorbent coating may be applied to the surface of the bezel.
  • other surfaces within the headlight housing of the motor vehicle headlight 100 can also be designed to be absorbent. It may also make sense to make the screen 150 reflective, for example by using a mirrored surface of the screen 150.
  • the reflected light rays can, for example, be directed to an absorbing point in the headlight 100 be directed in order to selectively suppress undesired single or multiple reflections in the headlight 100 in the direction of the projection optics 160; however, light components can also be deflected in such a way that they contribute to the light image in the illuminated areas, resulting in an increase in efficiency.
  • the optical element 150 in the form of the cover is arranged in a substantially vertically oriented manner in the installation position of the headlight in a vehicle.
  • substantially vertically oriented means an angular position (of the respective plane or diaphragm 150) which can deviate from the vertical by up to ⁇ 10°, preferably up to ⁇ 5°.
  • the exact angular position is particularly relevant when implementing light functions in which the edges 151, 152 must be sharply imaged, for example in the case of a low beam light function with a light/dark boundary. With other light functions, an angular position can be selected which can deviate from the vertical by up to ⁇ 25°.
  • the optical element 150 can also include a plurality of diaphragms, which are arranged rotatably in the form of a diaphragm shaft, with only one diaphragm of the diaphragm shaft being optically active or effective in the beam path of the light beam bundle.
  • the diaphragm shaft can realize several light functions, for example a low beam or a high beam light function of the headlight 100 .
  • a rotatable diaphragm shaft preferably has an axis of rotation which lies in the first or second image plane 170, 180.
  • a light beam 111 which is emitted by the light source 110 is shown as an example.
  • the light source 110 emits further unfocused light beams, for example diffuse light, in a radiation pattern specific to the light source.
  • the light beam 111 is coupled into the ellipsoidal reflector 130 at the reflector light entry point 131 (in the first focal point) and is reflected on the reflecting surface, passing through the second focal point of the ellipsoidal reflector 130 and coupled out again at the reflector light exit opening 132 becomes.
  • the reflector light entry point 131 corresponds to the first focal point into which the punctiform light source 110 (or a location of the light source with the highest intensity, as already mentioned) is positioned.
  • the ellipsoidal reflector 130 bundles the individual light beams of the emitted light into a bundle of light beams.
  • the collimator 140 further bundles the light beam and focuses it in the first, virtual image plane 170, in which the diaphragm 150 is also located.
  • the light beam bundle is projected by the projection optics 160 from its focal plane, which forms the second, imaginary image plane 180, into the emission direction of the headlight 100. Due to the arrangement of the diaphragm 150 and the two edges 151, 152 in the focal plane of the projection optics 160, the contour formed by the two edges 151, 152 is sharply imaged.
  • 3 and figure 5 show a second exemplary embodiment of a motor vehicle headlight 200 according to the invention, the difference from the first exemplary embodiment primarily being that the optical element 250 contains a component designed as a reflector.
  • the optical element 250 contains a component designed as a reflector.
  • the second embodiment of the 3 and 5 apply the explanations of the embodiment of 2 and 4 Unless otherwise stated in the following, in the same way, corresponding numbers with a leading digit 2 (instead of a 1 in the reference numbers of the first exemplary embodiment) being used for reference numbers.
  • the reflector 250 has two edges 251 and 252 ( 3 ) and is set up to deflect the first part of the light beam by means of a reflection on a surface of the optical element 250 to the projection optics 260, and to let a second part of the light beam past the two edges 251, 252 and the projection optics 160.
  • the reflector 250 can influence the light beam in such a way that it is (only) partially guided to the projection optics 260 .
  • the reflector 250 can be implemented by a mirrored surface of the reflector 250, for example.
  • Those points in headlight 200 to which the light beams of the light beam bundle passed by reflector 250 can advantageously be designed to be absorbent, for example in the form of a separate absorber component 255, in order to target unwanted single or multiple reflections in headlight 200 in the direction of projection optics 260 to suppress.
  • inner surface of the projection optics 260 may be arranged an additional panel (not shown) to suppress, for example, unwanted reflections in the direction of the projection axis.
  • another mirror component could be arranged, for example, in order to deflect the light beams to a point inside the headlight where absorption takes place.
  • the surface of the optical element 250 in the form of the reflector is oriented at an angle of inclination 253 to the horizontal, which is essentially in a range from 10° to 50°, preferably from 20° to 40° and particularly preferably 30°.
  • the first image plane 270 intersects with the second image plane 280 in a straight line in which the edge 251 also lies.
  • the arrangement of the light source 210, the light module 220, the ellipsoidal reflector 230 (including the associated reflector light entry point 231 and reflector light exit opening 232 and second focal point 233) and the collimator 240 in the second embodiment corresponds to that of the first embodiment, but these are Components slightly inclined compared to the first embodiment with respect to the projection optics 260 to allow the reflection of the light beam through the projection optics 260 in a motor vehicle headlight 200 favorable installation position.
  • the edge 251 is in the straight line, whereby the contour which passes through the edge 251 is formed is sharply imaged.
  • An arrangement according to the invention according to the second embodiment is used to increase the light yield for other light functions.
  • the reflector 250 can be arranged in a rotatably mounted manner, for example in order to implement a headlight range control of the motor vehicle headlight 200 .
  • the angle of inclination 253 can be controlled or regulated manually or electronically by a vehicle system, for example.
  • the angle of inclination 253 can preferably be rotated about the straight line which lies in the line of intersection of the first and second image planes 270, 280.
  • FIG. 6 to 8 The particular benefit of the invention can also be based on the Figures 6 to 8 are illustrated, each showing an exemplary light image according to a simulation of a light distribution for a partial high beam.
  • the simulation was computer-aided by the applicant for each of the Figures 6-8 headlight optics shown, in order to obtain a simulated light image of the respective headlight as a result.
  • Each light image describes the solid angle-related light distribution generated by the respective headlight from the driver's perspective, with the right and vertical axis labeled in degrees according to the deflection from the center of the image.
  • the scale on the right edge of each light image illustrates the gray levels used in the intensity distribution, given in cd [candela].
  • isolines of the brightness are drawn in each case, with the associated brightness value in cd also being given for some isolines.
  • FIG. 6 shows a light image for a headlight structure according to 1 was produced, which corresponds to the state of the art, ie with a collimator arranged immediately after the light source.
  • FIG. 7 shows a light pattern for the headlight according to the invention 2 and 4 , with an inventive ellipsoidal reflector and collimator with a vertical aperture.
  • FIG. 8 shows a light pattern for the headlight according to the invention 3 and 5 , with an ellipsoidal reflector according to the invention and with a diaphragm component acting as a reflector.
  • the system according to the invention with an ellipsoidal reflector has a light distribution ( 7 and 8) which have a brightness maximum with a value about twice as high as those according to the prior art ( 6 ) and which is also much better concentrated around the maximum.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (15)

  1. Projecteur de véhicule automobile (100, 200), comprenant
    une source de lumière (110, 210) conçue pour émettre de la lumière, et
    un réflecteur ellipsoïdal (130, 230) ayant un premier et un deuxième points focaux, le réflecteur ellipsoïdal (130, 230) étant conçu pour faire converger la lumière injectée par la source lumineuse (110, 210) via le premier point focal (131, 231) vers le deuxième point focal et pour la faire sortir par une ouverture de sortie de lumière du réflecteur (132, 232),
    caractérisé par
    un collimateur (140, 240) comprenant une surface d'entrée de lumière de collimateur (141, 241) et une surface de sortie de lumière de collimateur (142, 242), l'ouverture de sortie de lumière de réflecteur (132, 232) étant située avant la surface d'entrée de lumière de collimateur (141, 241) à une distance focale d'entrée (145, 245) du collimateur, un premier plan d'image (170, 270) étant associé au collimateur dans une distance focale de sortie (146, 246) du collimateur, et le collimateur (140, 240) étant conçu pour concentrer la lumière sortant du réflecteur ellipsoïdal (130, 230) dans la direction du premier plan d'image (170, 270) en un faisceau de rayons lumineux et pour y former une image lumineuse, et
    une optique de projection (160, 260) à laquelle est associé un deuxième plan d'image (180, 280) dans une distance focale d'entrée (161, 261), le premier plan d'image (170, 270) et le deuxième plan d'image (180, 280) se coupant ou se chevauchant, l'optique de projection (160, 260) étant conçue pour projeter l'image lumineuse dans la direction de rayonnement du projecteur de véhicule automobile (100, 200),
    dans lequel un élément optique (150, 250) avec au moins une arête optiquement efficace (151, 152, 251, 252) est positionné dans le trajet du faisceau lumineux entre le collimateur (140, 240) et l'optique de projection (160, 260), ledit élément optique (150, 250) étant conçu pour limiter le faisceau lumineux à l'aide dudit au moins un bord optiquement actif de manière à ce qu'il parvienne partiellement à l'optique de projection (160, 260), et l'élément optique (150, 250) est disposé de telle sorte que le premier et/ou le deuxième plan image (170, 270, 180, 280) passe par l'élément optique (150, 250).
  2. Projecteur de véhicule automobile (100, 200) selon la revendication 1, dans lequel ledit au moins un bord (151, 251) est rectiligne et orienté sensiblement horizontalement.
  3. Projecteur de véhicule automobile (100, 200) selon la revendication 1 ou 2, dans lequel le projecteur de véhicule automobile (100, 200) ou l'élément optique (150, 250) comprend au moins deux arêtes qui s'étendent chacune en ligne droite et sont disposées dans la trajectoire du faisceau lumineux de telle sorte qu'une coupure clair-obscur peut être générée pour une fonction de feu de croisement du projecteur de véhicule automobile (100, 200).
  4. Projecteur de véhicule automobile (100, 200) selon l'une quelconque des revendications 1 à 3, dans lequel la source lumineuse (110, 210) comporte au moins une source lumineuse à semi-conducteur, de préférence au moins une diode laser.
  5. Projecteur de véhicule automobile (100, 200) selon l'une quelconque des revendications 1 à 4, dans lequel le projecteur de véhicule automobile (100, 200) comporte en outre un moyen de conversion de lumière qui est disposé sur le trajet du faisceau lumineux et qui est conçu pour, en cas d'excitation par le faisceau lumineux avec une première plage de longueurs d'onde, exciter en outre au moins un autre faisceau lumineux avec une deuxième plage de longueurs d'onde différente de la première.
  6. Projecteur de véhicule automobile (100, 200) selon l'une quelconque des revendications 1 à 5, dans lequel le réflecteur ellipsoïdal (130, 230) est réalisé sous la forme d'une coque de réflecteur incurvée selon un ellipsoïde de révolution.
  7. Projecteur de véhicule automobile (100, 200) selon l'une quelconque des revendications 1 à 6, dans lequel le collimateur (140, 240) est une optique TIR.
  8. Projecteur de véhicule automobile (100, 200) selon l'une quelconque des revendications 1 à 7, dans lequel le collimateur (140, 240) est formé par une lentille convergente ayant un contour d'écartement (143, 243), le contour d'écartement (143, 243) définissant un plan situé à la distance focale d'entrée du collimateur (141, 241) en avant de la surface d'entrée de la lumière du collimateur.
  9. Projecteur de véhicule automobile (100, 200) selon la revendication 8, dans lequel le deuxième point focal du réflecteur ellipsoïdal est situé dans le plan du contour d'écartement (143, 243).
  10. Projecteur de véhicule automobile (100, 200) selon l'une quelconque des revendications 1 à 9, dans lequel l'optique de projection (160, 260) comporte au moins une lentille convergente.
  11. Projecteur de véhicule automobile (100) selon l'une quelconque des revendications 1 à 10, dans lequel l'élément optique (150) est un diaphragme et est agencé pour réfléchir ou absorber une première partie du faisceau lumineux au niveau de l'élément optique (150) en s'éloignant de l'optique de projection (160), et pour laisser passer une deuxième partie du faisceau lumineux au niveau de l'au moins un bord (151, 152) vers l'optique de projection (160).
  12. Projecteur de véhicule automobile (100) selon la revendication 11, dans lequel l'élément optique (150) est disposé orienté sensiblement verticalement.
  13. Projecteur de véhicule automobile (200) selon l'une quelconque des revendications 1 à 10, dans lequel l'élément optique (250) comprend un composant réfléchissant et est agencé pour dévier la première partie du faisceau lumineux vers l'optique de projection (260) au moyen d'une réflexion sur une surface de l'élément optique (250), et pour laisser passer une deuxième partie du faisceau lumineux devant ladite au moins une arête (251, 252) et devant l'optique de projection (160).
  14. Projecteur de véhicule automobile (200) selon la revendication 13, dans lequel la surface de l'élément optique (250) est orientée selon un angle d'inclinaison (253) par rapport à l'horizontale qui est sensiblement compris dans une plage de 10° à 50°, de préférence de 20° à 40° et plus préférentiellement de 30°.
  15. Projecteur de véhicule automobile (200) selon la revendication 13 ou 14, dans lequel le premier plan d'image (270) coupe le deuxième plan d'image (280) en une ligne droite dans laquelle se trouve également ladite au moins une arête (251).
EP19755297.9A 2018-08-02 2019-08-01 Phare de véhicule automobile à réflecteur ellipsoïde et collimateur Active EP3830473B1 (fr)

Applications Claiming Priority (2)

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EP18187022.1A EP3604903A1 (fr) 2018-08-02 2018-08-02 Phares de véhicule automobile à réflecteur ellipsoïde et collimateur
PCT/EP2019/070746 WO2020025740A1 (fr) 2018-08-02 2019-08-01 Phare de véhicule automobile pourvu d'un réflecteur ellipsoïdal et d'un collimateur

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EP3830473B1 true EP3830473B1 (fr) 2023-03-15

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WO2023169660A1 (fr) * 2022-03-08 2023-09-14 HELLA GmbH & Co. KGaA Dispositif d'éclairage de véhicule
CN115435293B (zh) * 2022-10-27 2023-03-24 常州星宇车灯股份有限公司 聚光效果好的厚壁光学模组及车灯系统

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KR20210034633A (ko) 2021-03-30
EP3604903A1 (fr) 2020-02-05
CN112534182B (zh) 2022-11-01
CN112534182A (zh) 2021-03-19
WO2020025740A1 (fr) 2020-02-06
EP3830473A1 (fr) 2021-06-09
KR102511409B1 (ko) 2023-03-17
JP6999064B2 (ja) 2022-02-04
JP2021532558A (ja) 2021-11-25
US11204145B2 (en) 2021-12-21
US20210317965A1 (en) 2021-10-14

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