EP3943809A1 - Motor vehicle headlamp with projection light modules - Google Patents
Motor vehicle headlamp with projection light modules Download PDFInfo
- Publication number
- EP3943809A1 EP3943809A1 EP21186577.9A EP21186577A EP3943809A1 EP 3943809 A1 EP3943809 A1 EP 3943809A1 EP 21186577 A EP21186577 A EP 21186577A EP 3943809 A1 EP3943809 A1 EP 3943809A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- guide plate
- light guide
- motor vehicle
- additional
- 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.)
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Classifications
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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
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/24—Light guides
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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]
- F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
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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
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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
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
- F21S41/255—Lenses with a front view of circular or truncated circular outline
Definitions
- the present invention relates to a motor vehicle headlight according to the preamble of claim 1.
- a projection light module is from DE 10 2018 113 768 A1 known and has a first projection light module having a first semiconductor light source, a first projection lens and a first additional light source and a first light guide plate.
- the first projection lens has a first optical axis and a first light entry surface, which can be illuminated with the first additional light source through the first light guide plate.
- the first additional light source is arranged on a narrow side of the first light guide plate so that the first Additional light source outgoing light occurs transversely to the first optical axis in the first light guide plate.
- the first light guide plate has a front emission side facing the first projection lens and a rear deflection side opposite the front emission side, as well as a first part closer to the first optical axis and a second part further away from the optical axis.
- the first part and the second part are components of the first light guide plate.
- these headlights are increasingly equipped with a low beam LED module that generates the full low beam of the headlight and a matrix high beam module that also represents the matrix function in the high beam case .
- a matrix function is understood here to mean that the high beam distribution has a number of matrix elements in the form of segments of the light distribution, which can be darkened in an individually controllable manner in order to avoid dazzling other road users and, at the same time, to achieve good illumination of the roadway with bright segments.
- both projection lenses of the projection light modules also then appear illuminated when only the low beam is on to achieve a consistent appearance between partial high beam and low beam
- an additional LED was previously installed on the LED circuit board of the matrix high beam module and its light was directed to the lens entry side via two metalized reflectors.
- the arrangement of the reflectors was selected in such a way that the light path of the matrix function is not disturbed and the reflection surface of the second reflector is close to the imaging plane of the projection lens.
- the matrix elements of the high-beam distribution are generated via converging lenses assigned to the respective LEDs, i.e. with a refractive attachment optics, and their imaging is generated via the downstream common projection lens, the additional light used to brighten the projection lens runs via two metalized reflectors.
- a homogeneous luminance is generated at the height of the front optics of the matrix light module by means of a light guide plate.
- the light guide is supplied with additional light from the side of an LED placed on the matrix light LED board.
- the light propagating within the light guide plate is directed towards the projection lens by prisms attached to the back of the plate.
- a homogeneous illumination of the light guide plate is achieved.
- Claim 1 differs from this prior art in its characterizing features. These provide that the first light guide plate is arranged in a tilted position in which the first part of the first light guide plate is further away from the first projection lens along the first optical axis removed than the second part of the light guide plate.
- the tilted arrangement further improves the homogeneity of the illumination of the first projection lens with additional light.
- a preferred embodiment is characterized in that the first projection light module is a high beam module.
- the matrix high beam has the property that the appearance of the lens changes depending on the location of the light and dark matrix elements. Therefore, the invention, which provides a more uniform appearance, has a particularly advantageous effect here.
- the motor vehicle headlight has a second projection light module, which has a second semiconductor light source, a second projection lens and a second additional light source as well as a second light guide plate, the second projection lens having a second optical axis and a second light entry surface, which communicate with the second additional light source through the second light guide plate can be illuminated through, the second additional light source being arranged on a narrow side of the second light guide plate in such a way that light emanating from the second additional light source enters the second light guide plate transversely to the second optical axis and the second light guide plate is one of the second has a front emission side facing the projection lens and a rear deflection side opposite the front emission side, as well as a first part that is closer to the second optical axis and a second part that is further away from the second optical axis, and that the light guide plate is arranged in a tilted position in which the first part of the second light guide plate is located farther from the second projection lens along the second optical axis than the second part
- the second projection light module has a mirror screen running from the back to the front in the motor vehicle headlight and that the light guide plate is arranged below the mirror screen.
- This configuration provides a low beam module with improved illumination of the projection lens. It also applies to this configuration that it has surprisingly been shown that the tilted arrangement further improves the homogeneity of the illumination of the second projection lens with additional light.
- an additional homogenization and adjustment of the light color of the lens illumination of the low beam lens to the lens illumination of the high beam lens can be achieved here.
- Another preferred embodiment is characterized in that the light color of the additional light source is unchangeable and differs from the light color of the high beam and/or the low beam.
- This configuration results in a fixed but deliberately different colored illumination of the remaining colorless light guide from the light color of the high beam and/or the low beam and thus a correspondingly multicolored illumination of the projection lens.
- Another preferred embodiment is characterized in that the first light guide plate and/or the second light guide plate has at least one colored area.
- the colored area is a light entry area of the otherwise colorless transparent light guide plate.
- the colored area is a colored coated light entry area of the otherwise colorless light guide plate.
- this attachment optics would be two-colored, as a so-called 2-component (2K) part.
- 2K 2-component
- the boundary surface of the two components together with the entry surface can be optimized with regard to a uniform colored illumination of the remaining light guide (2.2).
- Another variant instead of a two-colored light guide plate consists in a coating of the entrance surface of the otherwise colorless light guide plate, the optical properties of which are designed in such a way that it is only transparent to light of a fixed color or wavelength and absorbs or reflects all light of other colors or wavelengths.
- the light color of the first and/or second additional light source can be changed in a controllable manner and can differ from the light color of the high beam and/or the low beam.
- first and/or second additional light source has individually controllable, differently colored light-emitting diodes.
- a color of the lens illumination that changes over time, in particular a main light function that is deliberately different from the low beam and the high beam different color cannot be realized with the prior art mentioned above.
- This limitation of the possible appearances, with which, for example, a colored welcome light can be generated with the headlights, is eliminated by this configuration.
- a further preferred embodiment is characterized in that the individually controllable, different-colored light-emitting diodes include a red light-emitting light-emitting diode, a green light-emitting light-emitting diode and a blue light-emitting light-emitting diode.
- An alternative to using the light guide plate according to the invention could be one for both functions, ie for the function of generating a light distribution and the function of uniform illumination of the projection lenses, could lie in the use of a common lens attachment for these two functions.
- the figure 1 a motor vehicle headlight 10 with a main emission direction 12, which has v forward.
- the h designation indicates a rear position
- the r and l designations indicate a right side and a left side
- the o and u designations mark an upper and a lower position.
- the motor vehicle headlight 10 has a first projection light module 14 and a second projection light module 16 .
- the location and position information at the front, rear, right, left, top and bottom each relate to an orientation of the motor vehicle headlight in space when it is used as intended in a motor vehicle.
- FIG 2 shows a vertical section running between the front v and the rear h through the motor vehicle headlight 10, which has a housing 18 whose light exit opening is through a transparent Cover plate 20 is covered.
- the first projection light module 14 has a first semiconductor light source 22 , a first projection lens 24 and a first additional light source 26 and a first light guide plate 28 .
- the first projection lens 24 has a first optical axis 30 and a first light entry surface 32 .
- the first light entry surface 32 can be illuminated with additional light 34 from the first additional light source 26 through the first light guide plate 28 .
- the first additional light source 26 is arranged on a narrow side 36 of the first light guide plate 28 in such a way that additional light 34 emanating from the first additional light source 26 is transverse (i.e.
- the first light guide plate 28 has a first front emission side 38 facing the first projection lens 24 and a first rear deflection side 40 opposite the first front emission side 38 as well as a first part 42 lying closer to the first optical axis 30 and a first part 42 lying further from the second part 44 remote from the first optical axis 30.
- the first light guide plate 28 is arranged in a tilted position in which the first part 42 of the first light guide plate 28 is located further away from the first projection lens 24 along the first optical axis 30 than the second part 44 of the first light guide plate 28.
- the light guide plate is especially in the vertical section, which also includes the first optical axis 30 is not perpendicular to the first optical axis.
- figure 3 shows the first projection light module 14 from the front.
- two additional light sources 26 are provided, one of which is arranged on a right narrow side 36.r and one on a left narrow side 36.1.
- the additional light 34 emanating from the additional light sources 26 enters the first light guide plate 28 from the side and is distributed evenly in the first light guide plate 28, also as a result of internal total reflections.
- the additional light 34 is so steeply deflected to the first front emission side 38 of the first light guide plate 28 so that it emerges evenly distributed there.
- the exiting additional light 34 is scattered at least in the vertical direction by scattering structures 52 arranged in the first front emission side 38 such that it illuminates the first light entry surface 32 of the first projection lens 24 in a uniformly distributed manner.
- first projection light module 14 is a high beam module.
- the light emanating from the first semiconductor light source 22 is not shaded or deflected by a horizontal screen.
- the first semiconductor light source 22 of the first projection light module 14 has n LEDs arranged next to one another, each of which illuminates precisely one first optical attachment section 56 of a first optical attachment 50 which is assigned only to it. Accordingly, the number of first attachment optics sections 56 is also equal to n. The number n is equal to 6 here, without n being restricted to this value.
- the individual LEDs and the first additional light source 26 can be controlled individually with a control unit 58 of the first projection light module 14 .
- the visible light exit surfaces of the first attachment optics sections 56 are imaged forwards by the first projection lens 24, with the images being arranged like the light exit surfaces of the first attachment optics sections 56. By darkening individual LEDs, sections of the high beam distribution can thus be individually darkened in order to avoid dazzling other road users.
- the control unit 58 processes signals from a vehicle environment sensor system, for example a camera and/or radar sensors.
- the first (upper) part 42 of the first light guide plate 28 is located just below the first attachment optics sections 56 and in or near the imaging plane of a first projection lens 24 or a projection lens system. Therefore, a homogeneous illumination of the first projection lens 24 is achieved, which as such also under small (e.g. less than 5°) Viewing angles to the first optical axis 30 of the first projection lens 24 is visible.
- FIG 4 shows the motor vehicle headlight 10 with a second projection light module 16.
- the second projection light module 16 has a second semiconductor light source 74, a second projection lens 60 and a second additional light source 62 and a second light guide plate 64.
- the second projection lens 60 has a second optical axis 66 and a second light entry surface 54 which can be illuminated with the second additional light source 62 through the second light guide plate 64 .
- the second additional light source 62 is arranged on a narrow side of the second light guide plate 64 such that light emanating from the second additional light source 62 enters the second light guide plate 64 transversely to the second optical axis 66 .
- the second light guide plate 64 has a second front emission side 68 facing the second projection lens 60 and a second rear deflection side 70 opposite the second front emission side 68, as well as a first part 43 that is closer to the second optical axis 66 and a part that is further away from the second optical axis 66 lying second part 45 on.
- the second light guide plate 64 is arranged in a tilted position in which the first part 43 of the second light guide plate 64 is located further away from the second projection lens 60 along the second optical axis 66 than the second part 45 of the second Light guide plate 64.
- the second light guide plate 64 is not arranged at right angles to the second optical axis 66, in particular in the vertical section in which the second optical axis 66 also lies.
- a difference between the objects of Figures 2 and 3 on the one hand and the subject of Figures 4 and 5 on the other hand is that the second projection light module 16 has a mirror screen 72 running from the back to the front in the motor vehicle headlight 10 and that the second light guide plate 64 is arranged below the mirror screen 72 .
- the mirror diaphragm 72 has a reflecting surface which faces the second semiconductor light source 74 and the second optical head 76 and extends from the back to the front into the focal region of the second optical head 76 and the second projection lens 60 .
- the second attachment optics 76 is a half-shell reflector with an ellipsoidal basic shape.
- the second semiconductor light source is arranged in a focal point of the half-shell reflector.
- a second focal point, or focal area, of the half-shell reflector is intersected by the diaphragm edge 78 .
- the diaphragm edge 78 of the mirror diaphragm 72 lying in the focal area is imaged by the second projection lens 60 as a light-dark boundary of a low-beam light distribution running between the right and left.
- figure 5 shows a front view of the second projection light module 16 with the diaphragm edge 78 of the mirror diaphragm 72 running between the right and left, the second optical head 76 arranged above the mirror diaphragm 72 and the second light guide plate 64 arranged below the mirror diaphragm 72.
- FIG Figures 2 and 3 also for them Figures 4 and 5 .
- the second optical attachment 76 can be designed as a lens or light guide.
- the light guide plates 28, 64 are preferably made of the same light guide material as the optical attachments. As a result, the same light color is achieved with the light guide plates as with the attachment optics. This applies in any case if, for example, the first additional light source emits light of the same light color as the first semiconductor light source.
- a preferred embodiment provides for the use of colored LEDs as additional light sources.
- these additional light sources each have three LED chips R, G, B arranged closely next to one another, which together form a second semiconductor light source 74 . en.
- figure 6 shows a plan view of such an arrangement.
- the main emission direction of this arrangement is perpendicular to the plane of the drawing.
- Each of these chips R, G, B emits a different color of light that is permanently assigned to it, ideally red, green and blue.
- the colored LEDs R, G, B are controlled by the control device 58 for this purpose.
- RGB LEDs R, G, B As already described in general for light from the additional light sources, it also applies to the colored light from RGB LEDs R, G, B that this light is fed into the light guide plate and through a prism structure on the deflection side of the light guide plate 28, 64 in the direction of an imaging projection lens 24, 60 is deflected.
- the appearance of a motor vehicle headlight 10 could be converted into the appearance of a rear light.
- the low beam and the high beam could be turned off, and the associated projection lenses 24, 60 could be temporarily illuminated red to a To fulfill tail light function and / or a brake light function.
- figure 7 12 shows that the light guide plate 28 and/or 64 can be made entirely or partially of a colored transparent material as an alternative to using colored light sources and this light guide plate can then be fed with a white LED. This applies in particular to the area 80 of the feed or parts thereof.
- Such a light guide plate 28, 64 would be two-colored, which can be produced as a so-called 2-component (2K) part with a corresponding 2K injection molding process.
- 2K 2-component
- the boundary surface of the two then differently colored components of the light guide plate 28, 64 together with the light entry surface of the light guide plate 28, 64 can be optimized with regard to a uniform colored illumination of the rest of the light guide plate.
- Another variant instead of a two-tone light guide plate is a coating of the Entry surface of the otherwise colorless light guide plate, the optical properties of which are designed in such a way that it is only transparent to light of a fixed color or wavelength and absorbs or reflects all light of a different color or wavelength.
- the light guide plate 28, 64 has a narrow side 36 via which light from an additional light source 26, 62 (cf Figures 2 to 4 ) is fed into the light guide plate 28, 64.
- the narrow side 36 closes off a coupling prism, which has a trapezoidal cross section and extends over the height of the prism.
- the narrow side 36 forms one of the two parallel faces of the prism.
- the surface of the prism parallel thereto forms a transition surface with which the area 80 of the feed, which is identical here to the prism, merges into the rest of the light guide plate.
- the light from the additional light source that is fed into the light guide plate via the colored area 80 of the feed is subjected to internal total reflections that reduce the aperture angle of the fed-in light at the mutually inclined boundary surfaces of the prismatic area 31 .
- This light is then deflected at a preferably curved edge area into an area of the printed circuit board that has a flat, tilted central area.
- This area is limited to the rear by a deflection surface and to the front by a radiating surface.
- Deflection elements are arranged in the deflection surface, for example vertically have running edges that delimit oblique prism faces.
- the deflection elements are shaped in such a way that light from the additional light source incident on them from the interior of the light guide plate is deflected so steeply by internal total reflections to the front emission surface that it emerges from the light guide plate there, with the light preferably being emitted obliquely upwards.
- Deflection elements in the form of sections of a roller are preferably arranged in the emission surface, which distribute the light emerging from the emission surface so widely that it homogeneously illuminates the light entry surface of the projection lens that follows in the beam path.
- the roller sections preferably extend from the narrow side serving as the light entry side across the entire width of the emission surface. In this case, convex roller sections and concave roller sections preferably alternate.
- the generatrices of the roller sections run parallel to one another.
- the surface lines run transversely to the optical axis between a left and a right position.
- the edges of the deflection elements arranged in the deflection surface preferably run between an upper and a lower position, so that the deflection elements and the roller sections run transversely to one another.
- figure 8 shows an arrangement of a first optical head 50, a tilted arranged first light guide plate 28 and a first additional light source 26 and a first projection lens.
- the first light guide plate 28 draws is characterized by a uniformly curved transition from its emission and deflection sides to the lateral narrow sides 36 serving to feed in the additional light.
- the narrow side 36 used to feed in the additional light is preferably in the light entry plane of the attachment optics 76, 50.
- the additional light source(s) and the LEDs used to generate the headlight light distribution can be arranged on the same flat and rigid circuit board. This applies analogously to the figures 9 and 10 .
- FIG. 9 shows an arrangement with a light guide plate which is less high in the vertical direction than the light guide plate of FIG figure 8
- the figure 10 FIG. 12 shows another arrangement having a second light guide plate 64 which is narrower in the left-right horizontal direction than the light guide plate of FIG figure 8 , together with a projection lens system instead of a single first projection lens 24 or second projection lens 60
- the light guide plate according to FIG figure 10 has a kink at its transition between its emission side and the side serving to feed in the light. Narrow emission sides can also be realized in this way, since the kinks require less space with regard to a change of direction than curved transitions.
Abstract
Vorgestellt wird ein Kraftfahrzeugscheinwerfer mit einem ersten Projektionslichtmodul, das eine erste Projektionslinse und eine erste Zusatzlichtquelle sowie eine erste Lichtleiterplatte aufweist. Die Lichtleiterplatte ist in einer verkippten Stellung angeordnet, in der sich der erste Teil der ersten Lichtleiterplatte entlang der ersten optischen Achse weiter von der ersten Projektionslinse entfernt befindet als der zweite Teil der Lichtleiterplatte. Es werden Ausgestaltungen mit teilweise farbigen Lichtleiterplatten und weißes Licht emittierenden Zusatzlichtquellen, sowie Ausgestaltungen mit farblosen Leiterplatten und farbiges Licht emittierenden Zusatzlichtquellen sowie mit farblosen Leiterplatten und weißes Licht emittierenden Zusatzlichtquellen beschrieben.A motor vehicle headlight is presented with a first projection light module, which has a first projection lens and a first additional light source as well as a first light guide plate. The light guide plate is arranged in a tilted position in which the first part of the first light guide plate is located farther from the first projection lens along the first optical axis than the second part of the light guide plate. Configurations with partially colored light guide plates and additional light sources emitting white light, as well as configurations with colorless circuit boards and additional light sources emitting colored light, and with colorless circuit boards and additional light sources emitting white light are described.
Description
Die vorliegende Erfindung betrifft einen Kraftfahrzeugscheinwerfer nach dem Oberbegriff des Anspruchs 1. Ein solches Projektionslichtmodul ist aus der
Zur Realisierung von Kraftfahrzeugscheinwerfern mit einem LED-Abblendlicht und einem LED-Fernlicht bzw. LED-Matrixfernlicht diese Scheinwerfer mehr und mehr mit jeweils einem AbblendlichtLED-Modul, das das volle Abblendlicht des Scheinwerfers erzeugt, und einem Matrixfernlichtmodul, das zusätzlich im Fernlichtfall die Matrixfunktion darstellt. Unter einer Matrixfunktion wird hier verstanden, dass die Fernlichtverteilung eine Mehrzahl von Matrixelementen in Form von Segmenten der Lichtverteilung aufweist, die sich individuell steuerbar abdunkeln lassen, um Blendungen anderer Verkehrsteilnehmer zu vermeiden und gleichzeitig mit hellen Segmenten eine gute Ausleuchtung der Fahrbahn zu erzielen.In order to implement motor vehicle headlights with an LED low beam and an LED high beam or LED matrix high beam, these headlights are increasingly equipped with a low beam LED module that generates the full low beam of the headlight and a matrix high beam module that also represents the matrix function in the high beam case . A matrix function is understood here to mean that the high beam distribution has a number of matrix elements in the form of segments of the light distribution, which can be darkened in an individually controllable manner in order to avoid dazzling other road users and, at the same time, to achieve good illumination of the roadway with bright segments.
Bei Kraftfahrzeugscheinwerfern mit einem Projektionslichtmodul für Fernlicht und einem Projektionslichtmodul für Abblendlicht wird gewünscht, dass beide Projektionslinsen der Projektionslichtmodule auch dann leuchtend erscheinen, wenn nur das Abblendlicht eingeschaltet ist, um ein einheitliches Erscheinungsbild zwischen Teilfernlicht und Abblendlicht zu erzielenIn the case of motor vehicle headlights with a projection light module for high beam and a projection light module for low beam, it is desired that both projection lenses of the projection light modules also then appear illuminated when only the low beam is on to achieve a consistent appearance between partial high beam and low beam
Zu diesem Zweck wurde bisher eine zusätzliche LED auf der LED-Platine des Matrixfernlichtmoduls verbaut und dessen Licht über zwei metallisierte Reflektoren auf die Linseneintrittsseite gelenkt. Die Anordnung der Reflektoren war dabei so gewählt, dass der Lichtpfad der Matrixfunktion nicht gestört wird und die Reflexionsfläche des zweiten Reflektors nahe der Abbildungsebene der Projektionslinse liegt.For this purpose, an additional LED was previously installed on the LED circuit board of the matrix high beam module and its light was directed to the lens entry side via two metalized reflectors. The arrangement of the reflectors was selected in such a way that the light path of the matrix function is not disturbed and the reflection surface of the second reflector is close to the imaging plane of the projection lens.
Werden die Matrixelemente der Fernlichtverteilung über den jeweiligen LEDs zugeordnete Sammellinsen, also mit einer refraktiven Vorsatzoptik, und deren Abbildung über die nachgeschaltete gemeinsame Projektionslinse erzeugt, läuft das zur Aufhellung der Projektionslinse dienende Zusatzlicht über zwei metallisierte Reflektoren.If the matrix elements of the high-beam distribution are generated via converging lenses assigned to the respective LEDs, i.e. with a refractive attachment optics, and their imaging is generated via the downstream common projection lens, the additional light used to brighten the projection lens runs via two metalized reflectors.
Dadurch kommt es zu einer anderen Lichtfarbe als beim Matrixlicht. Dies lässt sich auch durch eine geeignete Wahl der dazugehörigen LED, insbesondere deren zugehörige Farborte, nicht gänzlich kompensieren. Das beschriebene optische System der Linsenaufhellung des Fernlichtmoduls unterscheidet sich vor allem auch von dem des Abblendlichtmoduls. Hierdurch weicht die Lichtfarbe des Zusatzlichtes von der des Abblendlichtes ab.This results in a different light color than the matrix light. This cannot be completely compensated for by a suitable choice of the associated LED, in particular their associated color locations. The described optical system of the lens brightening of the high-beam module also differs from that of the low-beam module. As a result, the light color of the additional light differs from that of the low beam.
Des Weiteren gelingt durch die zwangsläufige geneigte Anordnung des zweiten Reflektors des bekannten Zusatzlichtes eine Annäherung an die Abbildungsebene der Projektionslinse nur unzureichend. Dies führt zu einem inhomogenen Erscheinungsbild der leuchtenden Linse.Furthermore, due to the inevitable inclined arrangement of the second reflector of the known additional light, an approximation to the imaging plane of the projection lens succeeds only inadequately. This leads to an inhomogeneous appearance of the luminous lens.
Nach der oben genannten
Von diesem Stand der Technik unterscheidet sich der Anspruch 1 durch seine kennzeichnenden Merkmale. Diese sehen vor, dass die erste Lichtleiterplatte in einer verkippten Stellung angeordnet ist, in der sich der erste Teil der ersten Lichtleiterplatte entlang der ersten optischen Achse weiter von der ersten Projektionslinse entfernt befindet als der zweite Teil der Lichtleiterplatte.Claim 1 differs from this prior art in its characterizing features. These provide that the first light guide plate is arranged in a tilted position in which the first part of the first light guide plate is further away from the first projection lens along the first optical axis removed than the second part of the light guide plate.
Es hat sich überraschend gezeigt, dass die gekippte Anordnung die Homogenität der Ausleuchtung der ersten Projektionslinse mit Zusatzlicht weiter verbessert.Surprisingly, it has been shown that the tilted arrangement further improves the homogeneity of the illumination of the first projection lens with additional light.
Eine bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass das erste Projektionslichtmodul ein Fernlichtmodul ist. Das Matrixfernlicht hat die Eigenschaft, dass sich das Erscheinungsbild der Linse in Abhängigkeit von der Lage der hellen und dunklen Matrixelemente ändert. Daher wirkt sich die Erfindung, die für ein gleichmäßigeres Erscheinungsbild sorgt, hier besonders vorteilhaft aus.A preferred embodiment is characterized in that the first projection light module is a high beam module. The matrix high beam has the property that the appearance of the lens changes depending on the location of the light and dark matrix elements. Therefore, the invention, which provides a more uniform appearance, has a particularly advantageous effect here.
Bevorzugt ist auch, dass der Kraftfahrzeugscheinwerfer ein zweites Projektionslichtmodul, das eine zweite Halbleiterlichtquelle, eine zweite Projektionslinse und eine zweite Zusatzlichtquelle sowie eine zweite Lichtleiterplatte aufweist, wobei die zweite Projektionslinse eine zweite optische Achse und eine zweite Lichteintrittsfläche aufweist, die mit der zweiten Zusatzlichtquelle durch die zweite Lichtleiterplatte hindurch beleuchtbar ist, wobei die zweite Zusatzlichtquelle an einer Schmalseite der zweiten Lichtleiterplatte so angeordnet ist, dass von der zweiten Zusatzlichtquelle ausgehendes Licht quer zu der zweiten optischen Achse in die zweite Lichtleiterplatte eintritt und die zweite Lichtleiterplatte eine der zweiten Projektionslinse zugewandte vordere Abstrahlseite und eine der vorderen Abstrahlseite gegenüberliegende hintere Umlenkseite sowie einen näher an der zweiten optischen Achse liegenden ersten Teil und einen weiter von der zweiten optischen Achse entfernt liegenden zweiten Teil aufweist, und dass die Lichtleiterplatte in einer verkippten Stellung angeordnet ist, in der sich der erste Teil der zweiten Lichtleiterplatte entlang der zweiten optischen Achse weiter von der zweiten Projektionslinse entfernt befindet als der zweite Teil der zweiten Lichtleiterplatte.It is also preferred that the motor vehicle headlight has a second projection light module, which has a second semiconductor light source, a second projection lens and a second additional light source as well as a second light guide plate, the second projection lens having a second optical axis and a second light entry surface, which communicate with the second additional light source through the second light guide plate can be illuminated through, the second additional light source being arranged on a narrow side of the second light guide plate in such a way that light emanating from the second additional light source enters the second light guide plate transversely to the second optical axis and the second light guide plate is one of the second has a front emission side facing the projection lens and a rear deflection side opposite the front emission side, as well as a first part that is closer to the second optical axis and a second part that is further away from the second optical axis, and that the light guide plate is arranged in a tilted position in which the first part of the second light guide plate is located farther from the second projection lens along the second optical axis than the second part of the second light guide plate.
Weiter ist bevorzugt, dass das zweite Projektionslichtmodul eine im Kraftfahrzeugscheinwerfer von hinten nach vorn verlaufende Spiegelblende aufweist und dass die Lichtleiterplatte unterhalb der Spiegelblende angeordnet ist.It is also preferred that the second projection light module has a mirror screen running from the back to the front in the motor vehicle headlight and that the light guide plate is arranged below the mirror screen.
Durch diese Ausgestaltung wird ein Abblendlichtmodul mit verbesserter Ausleuchtung der Projektionslinse bereitgestellt. Auch für diese Ausgestaltung gilt, dass sich überraschend gezeigt hat, dass die gekippte Anordnung die Homogenität der Ausleuchtung der zweiten Projektionslinse mit Zusatzlicht weiter verbessert. Durch die Verwendung derselben Merkmale im Abblendlichtmodul wie im Fernlichtmodul lässt sich hier eine zusätzliche Homogenisierung und Angleichung der Lichtfarbe der Linsenausleuchtung der Abblendlichtlinse an die Linsenausleuchtung der Fernlichtlinse erzielen.This configuration provides a low beam module with improved illumination of the projection lens. It also applies to this configuration that it has surprisingly been shown that the tilted arrangement further improves the homogeneity of the illumination of the second projection lens with additional light. By using the same features in the low beam module as in the high beam module, an additional homogenization and adjustment of the light color of the lens illumination of the low beam lens to the lens illumination of the high beam lens can be achieved here.
Eine weitere bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass die Lichtfarbe der Zusatzlichtquelle unveränderlich ist und sich von der Lichtfarbe des Fernlichtes und/oder des Abblendlichtes unterscheidet. Durch diese Ausgestaltung ergibt sich eine feste aber von der Lichtfarbe des Fernlichtes und/oder des Abblendlichtes bewusst verschieden farbige Ausleuchtung des restlichen farblosen Lichtleiters und somit eine entsprechend mehrfarbige Ausleuchtung der Projektionslinse.Another preferred embodiment is characterized in that the light color of the additional light source is unchangeable and differs from the light color of the high beam and/or the low beam. This configuration results in a fixed but deliberately different colored illumination of the remaining colorless light guide from the light color of the high beam and/or the low beam and thus a correspondingly multicolored illumination of the projection lens.
Eine weitere bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass die erste Lichtleiterplatte und/oder die zweite Lichtleiterplatte wenigstens einen farbigen Bereich aufweist.Another preferred embodiment is characterized in that the first light guide plate and/or the second light guide plate has at least one colored area.
Bevorzugt ist auch, dass der farbige Bereich ein Lichteintrittsbereich der im Übrigen farblos transparenten Lichtleiterplatte ist.It is also preferred that the colored area is a light entry area of the otherwise colorless transparent light guide plate.
Weiter ist bevorzugt, dass der farbige Bereich ein farbig beschichteter Lichteintrittsbereich der ansonsten farblosen Lichtleiterplatte ist.It is further preferred that the colored area is a colored coated light entry area of the otherwise colorless light guide plate.
Diese Ausgestaltungen, bei denen die Lichtleiterplatte oder Teile dieser, insbesondere der Bereich der Einspeisung (2.1), aus einem farbig-transparenten Material ausgestaltet werden, haben den Effekt, dass eine erwünschte farbige Ausleuchtung der Projektionslinse(n) durch Speisung der Lichtleiterplatte(n) mit einer weißes Licht emittierenden LED erzielt werden kann. Damit wird eine Alternative zur Verwendung farbiger Lichtquellen bereitgestellt.These configurations, in which the light guide plate or parts thereof, in particular the area of the feed (2.1), are made of a colored-transparent material, have the effect that a desired colored illumination of the projection lens(es) can be achieved by feeding the light guide plate(s). with a white light emitting LED can be achieved. This provides an alternative to using colored light sources.
Dann wäre diese Vorsatzoptik zwei farbig, als ein sogenanntes 2-Komponten-(2K)-Teil. Im Speziellem kann die Grenzfläche der beiden Komponenten zusammen mit der Eintrittsfläche hinsichtlich einer einheitlichen farbigen Ausleuchtung des restlichen Lichtleiters (2.2) optimiert sein.Then this attachment optics would be two-colored, as a so-called 2-component (2K) part. In particular, the boundary surface of the two components together with the entry surface can be optimized with regard to a uniform colored illumination of the remaining light guide (2.2).
Eine weitere Variante anstelle einer zweifarbigen Lichtleiterplatte besteht in einer Beschichtung der Eintrittsfläche der ansonsten farblosen Lichtleiterplatte, deren optische Eigenschaften derart gestaltet ist, dass diese nur für Licht einer festen Farbe bzw. Wellenlänge transparent ist und sämtliche Licht anderer Farbe bzw. Wellenlängen absorbiert oder reflektiert.Another variant instead of a two-colored light guide plate consists in a coating of the entrance surface of the otherwise colorless light guide plate, the optical properties of which are designed in such a way that it is only transparent to light of a fixed color or wavelength and absorbs or reflects all light of other colors or wavelengths.
Bevorzugt ist auch, dass die Lichtfarbe der ersten und/oder zweiten Zusatzlichtquelle steuerbar veränderlich ist und sich von der Lichtfarbe des Fernlichtes und/oder des Abblendlichtes unterscheiden kann.It is also preferred that the light color of the first and/or second additional light source can be changed in a controllable manner and can differ from the light color of the high beam and/or the low beam.
Weiter ist bevorzugt, dass die erste und/oder zweite Zusatzlichtquelle individuell steuerbare, verschiedenfarbige Leuchtdioden aufweist.It is also preferred that the first and/or second additional light source has individually controllable, differently colored light-emitting diodes.
Eine zeitlich veränderte Farbe der Linsenausleuchtung, insbesondere eine zu dem Abblendlicht und dem Fernlicht bewusst verschiedene Hauptlichtfunktionen bewusst verschiedene Farbe, lässt sich mit dem oben genannten Stand der Technik nicht realisieren. Diese Einschränkung der möglichen Erscheinungsbilder, mit denen zum Beispiel ein farbiges Begrüßungslicht mit den Scheinwerfern erzeugbar ist, wird durch diese Ausgestaltung beseitigt.A color of the lens illumination that changes over time, in particular a main light function that is deliberately different from the low beam and the high beam different color cannot be realized with the prior art mentioned above. This limitation of the possible appearances, with which, for example, a colored welcome light can be generated with the headlights, is eliminated by this configuration.
Eine weitere bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass die individuell steuerbaren, verschiedenfarbigen Leuchtdioden eine rotes Licht emittierende Leuchtdiode, eine grünes Licht emittierende Leuchtdiode und eine blaues Licht emittierende Leuchtdiode umfassen.A further preferred embodiment is characterized in that the individually controllable, different-colored light-emitting diodes include a red light-emitting light-emitting diode, a green light-emitting light-emitting diode and a blue light-emitting light-emitting diode.
Eine Alternative zur erfindungsgemäßen Verwendung der Lichtleiterplatte könnte eine für beide Funktionen, also für die Funktion der Erzeugung einer Lichtverteilung und die Funktion der gleichmäßigen Ausleuchtung der Projektionslinsen könnte in der Verwendung einer für diese beiden Funktionen gemeinsamen Vorsatzoptik liegen.An alternative to using the light guide plate according to the invention could be one for both functions, ie for the function of generating a light distribution and the function of uniform illumination of the projection lenses, could lie in the use of a common lens attachment for these two functions.
Weitere Vorteile ergeben sich aus der nachfolgenden Beschreibung, den Zeichnungen und den Unteransprüchen. Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.Further advantages result from the following description, the drawings and the dependent claims. It goes without saying that the features mentioned above and those still to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert.Embodiments of the invention are illustrated in the drawings and are described in the following explained in more detail.
Dabei zeigen, jeweils in schematischer Form:
- Figur 1
- einen Kraftfahrzeugscheinwerfer mit Angaben zu Anordnung im Raum;
- Figur 2
- einen vertikalen Schnitt durch einen Kraftfahrzeugscheinwerfer;
- Figur 3
- ein erstes Projektionslichtmodul von vorn;
- Figur 4
- ein zweites Projektionslichtmodul;
- Figur 5
- eine Vorderansicht des zweiten Projektionslichtmoduls; und
- Figur 6
- eine schematische Draufsicht auf eine RGB-LED;
- Figur 7
- eine Lichtleiterplatte, die ganz oder teilweise aus einem farbig-transparenten Material ausgestaltet ist.
- Figur 8
- eine Anordnung mit einer verkippt angeordneten ersten Lichtleiterplatte, die sich durch einen gleichmäßig gekrümmten Übergang von ihren Abstrahl- und Umlenkseiten in die zur Einspeisung des Zusatzlichtes dienenden seitlichen Schmalseiten auszeichnet;
- Figur 9
- eine Anordnung mit einer Lichtleiterplatte, die in Vertikalrichtung weniger hoch ist als die Lichtleiterplatte der
Figur 8 ; und Figur 10- eine weitere Anordnung mit einer Lichtleiterplatte, die in der zwischen rechts und links verlaufenden horizontalen Richtung weniger breit ist als die Lichtleiterplatte der
Figur 8 .
- figure 1
- a motor vehicle headlamp with information on its arrangement in space;
- figure 2
- a vertical section through a motor vehicle headlight;
- figure 3
- a first projection light module from the front;
- figure 4
- a second projection light module;
- figure 5
- a front view of the second projection light module; and
- figure 6
- a schematic plan view of an RGB LED;
- figure 7
- a light guide plate made entirely or partially of a colored transparent material.
- figure 8
- an arrangement with a tilted first light guide plate, which is characterized by a uniformly curved transition from its emission and deflection sides to the lateral narrow sides serving to feed in the additional light;
- figure 9
- discloses an arrangement having a light guide plate that is less high in the vertical direction than the light guide plate of FIG
figure 8 ; and - figure 10
- discloses another arrangement having a light guide plate narrower in width in the left-right horizontal direction than the light guide plate of FIG
figure 8 .
Im Einzelnen zeigt die
ne obere und eine untere Position kennzeichnen. Der Kraftfahrzeugscheinwerfer 10 weist ein erstes Projektionslichtmodul 14 und ein zweites Projektionslichtmodul 16 auf. Die Lage- und Positionsangaben vorne, hinten, rechts, links, oben und unten beziehen sich jeweils auf eine Orientierung des Kraftfahrzeugscheinwerfers im Raum bei seiner bestimmungsgemäßen Verwendung in einem Kraftfahrzeug.In detail, the
mark an upper and a lower position. The
Das in den
Die erste Halbleiterlichtquelle 22 des ersten Projektionslichtmoduls 14 weist n nebeneinander angeordnete LEDs auf, von denen jede genau einen und nur ihr zugeordneten ersten Vorsatzoptikabschnitt 56 einer ersten Vorsatzoptik 50 beleuchtet. Die Zahl der ersten Vorsatzoptikabschnitte 56 ist entsprechend ebenfalls gleich n. Die Zahl n ist hier gleich 6, ohne dass n auf diesen Wert beschränkt sein soll. Die einzelnen LEDs und die erste Zusatzlichtquelle 26 sind mit einem Steuergerät 58 des ersten Projektionslichtmoduls 14 individuell steuerbar. Die in der
Bei sämtlichen Ausgestaltungen des ersten Projektionslichtmoduls 14 befindet sich der erste (obere) Teil 42 der ersten Lichtleiterplatte 28 dicht unterhalb der ersten Vorsatzoptikabschnitte 56 und in, bzw. in der Nähe der Abbildungsebene einer ersten Projektionslinse 24 bzw. eines Projektionslinsensystems. Daher gelingt eine homogene Ausleuchtung der ersten Projektionslinse 24, die als solche auch unter kleinen (z.B. kleiner als 5°) Betrachtungswinkeln zur ersten optischen Achse 30 der ersten Projektionslinse 24 sichtbar ist.In all configurations of the first
Ein Unterschied zwischen den Gegenständen der
Die Spiegelblende 72 weist eine der zweiten Halbleiterlichtquelle 74 und der zweiten Vorsatzoptik 76 zugewandte spiegelnde Fläche auf, die sich von hinten nach vorn bis in den Fokalbereich der zweiten Vorsatzoptik 76 und der zweiten Projektionslinse 60 hinein erstreckt. Die zweite Vorsatzoptik 76 ist hier ein Halbschalenreflektor mit einer ellipsoiden Grundform. Die zweite Halbleiterlichtquelle ist in einem Brennpunkt des Halbschalenreflektors angeordnet. Ein zweiter Brennpunkt, bzw. Fokalbereich des Halbschalenreflektors wird von der Blendenkante 78 geschnitten. Die im Fokalbereich liegende Blendenkante 78 der Spiegelblende 72 wird von der zweiten Projektionslinse 60 als zwischen rechts und links verlaufende Hell-Dunkel-Grenze einer Abblendlichtverteilung abgebildet.The
In Bezug auf die Funktion und Details der zweiten Lichtleiterplatte 64 und der Zusatzlichterzeugung gilt weitgehend die Beschreibung der
Alternativ zu der Verwendung eines Reflektors als zweite Vorsatzoptik 76 kann die zweite Vorsatzoptik 76 als Linse oder Lichtleiter ausgeführt sein. In einer Ausgestaltung bestehen die Lichtleiterplatten 28, 64 bevorzugt aus dem gleichen Lichtleitermaterial wie die Vorsatzoptiken. Dadurch wird mit den Lichtleiterplatten die gleiche Lichtfarbe erzielt wie mit den Vorsatzoptiken. Dies gilt jedenfalls dann, wenn z.B. die erste Zusatzlichtquelle Licht gleicher Lichtfarbe emittiert wie die erste Halbleiterlichtquelle.As an alternative to using a reflector as the second
Weitere Ausgestaltungen sehen dagegen bewusst erzeugte Unterschiede zwischen den Lichtfarben, mit denen primär Lichtverteilungen erzeugt werden, und Lichtfarben, mit denen primär die Projektionslinsen zusätzlich mit dem Zusatzlicht gleichmäßig ausgeleuchtet werden, vor.Other configurations, on the other hand, provide for deliberately created differences between the light colors, with which light distributions are primarily generated, and light colors, with which the projection lenses are primarily additionally uniformly illuminated with the additional light.
Hierzu sieht man in einer bevorzugten Ausgestaltung die Verwendung von farbigen LEDs als Zusatzlichtquellen vor. Vorteilhafterweise weisen diese Zusatzlichtquellen jeweils drei dicht nebeneinander angeordnete LED-Chips R, G, B auf, die zusammen eine zweite Halbleiterlichtquelle 74 bilden. de.To this end, a preferred embodiment provides for the use of colored LEDs as additional light sources. Advantageously, these additional light sources each have three LED chips R, G, B arranged closely next to one another, which together form a second
Diese Alternative würde eine feste aber von der Lichtfarbe der Abblendlichtverteilung und/oder der Fernlichtverteilung bewusst verschiedene farbige Ausleuchtung der übrigen farblosen Lichtleiterplatte ergeben und somit zu einem entsprechend farbigen Zusatzlicht für die Ausleuchtung der Projektionslinsen 24, 60 führen.This alternative would result in a fixed but deliberately different colored illumination of the remaining colorless light guide plate from the light color of the low beam distribution and/or the high beam distribution and thus lead to a correspondingly colored additional light for the illumination of the
Eine solche Lichtleiterplatte 28, 64 wäre zweifarbig, was als ein sogenanntes 2-Komponenten-(2K)-Teil mit einem entsprechenden 2K-Spritzgussverfahren herstellbar ist. Im Speziellem kann die Grenzfläche der beiden dann farblich unterschiedlichen Komponenten der Lichtleiterplatte 28, 64 zusammen mit der Lichteintrittsfläche der Lichtleiterplatte 28, 64 hinsichtlich einer einheitlichen farbigen Ausleuchtung der übrigen Lichtleiterplatte optimiert sein.Such a
Eine weitere Variante anstelle einer zweifarbigen Lichtleiterplatte besteht in einer Beschichtung der Eintrittsfläche der ansonsten farblosen Lichtleiterplatte, deren optische Eigenschaften derart gestaltet ist, dass diese nur für Licht einer festen Farbe bzw. Wellenlänge transparent ist und sämtliche Licht anderer Farbe bzw. Wellenlängen absorbiert oder reflektiert.Another variant instead of a two-tone light guide plate is a coating of the Entry surface of the otherwise colorless light guide plate, the optical properties of which are designed in such a way that it is only transparent to light of a fixed color or wavelength and absorbs or reflects all light of a different color or wavelength.
Die Lichtleiterplatte 28, 64 weist eine Schmalseite 36 auf, über die Licht einer Zusatzlichtquelle 26, 62 (Vergleiche
Claims (11)
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WO2023156033A1 (en) * | 2022-02-15 | 2023-08-24 | Hella Autotechnik Nova S.R.O. | Headlamp for a car |
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DE102018113768A1 (en) | 2018-06-08 | 2019-12-12 | Automotive Lighting Reutlingen Gmbh | Motor vehicle headlight with at least two light modules |
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DE102011076621B4 (en) | 2011-05-27 | 2017-03-02 | Automotive Lighting Reutlingen Gmbh | Lighting device for a motor vehicle |
JP2012256491A (en) | 2011-06-08 | 2012-12-27 | Stanley Electric Co Ltd | Vehicle lamp unit |
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- 2020-07-21 DE DE102020119195.2A patent/DE102020119195A1/en active Pending
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DE102010046021A1 (en) * | 2010-09-18 | 2012-03-22 | Automotive Lighting Reutlingen Gmbh | Motor vehicle headlight with a multi-function projection module |
EP3379139A1 (en) * | 2015-11-20 | 2018-09-26 | Koito Manufacturing Co., Ltd. | Lamp fitting unit |
KR20190036807A (en) * | 2017-09-28 | 2019-04-05 | 에스엘 주식회사 | Lamp for vehicle and lamp assembly including the same |
CN207674345U (en) * | 2018-01-19 | 2018-07-31 | 上海小糸车灯有限公司 | Concentrator and car light module |
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