EP3982037A1 - Dispositif d'éclairage de véhicule automobile pourvu d'au moins un module lumineux de microprojection et son procédé de fabrication - Google Patents

Dispositif d'éclairage de véhicule automobile pourvu d'au moins un module lumineux de microprojection et son procédé de fabrication Download PDF

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Publication number
EP3982037A1
EP3982037A1 EP21201366.8A EP21201366A EP3982037A1 EP 3982037 A1 EP3982037 A1 EP 3982037A1 EP 21201366 A EP21201366 A EP 21201366A EP 3982037 A1 EP3982037 A1 EP 3982037A1
Authority
EP
European Patent Office
Prior art keywords
micro
light
motor vehicle
lighting device
vehicle lighting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP21201366.8A
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German (de)
English (en)
Other versions
EP3982037B1 (fr
Inventor
Felix Freytag
Dr. Sebastian Schildmann
Tobias Leuz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli Automotive Lighting Reutlingen Germany GmbH
Original Assignee
Marelli Automotive Lighting Reutlingen Germany GmbH
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Publication date
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Publication of EP3982037A1 publication Critical patent/EP3982037A1/fr
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Publication of EP3982037B1 publication Critical patent/EP3982037B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/265—Composite lenses; Lenses with a patch-like shape
    • 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
    • F21S41/275—Lens surfaces, e.g. coatings or surface structures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/47—Attachment thereof

Definitions

  • the present invention relates to a motor vehicle lighting device with at least one micro-projection light module, which has a light source, an attachment optics and a micro-projection optics element, which has a multiplicity of micro-projectors arranged in rows and columns, each of which has a light entry surface, an aperture layer and an exit lens surface.
  • the invention relates to a method for producing such a motor vehicle lighting device.
  • a projector structure made up of a large number of micro-projectors has proven to be suitable.
  • Such a projector is part of a motor vehicle headlight from DE 10 2017 112 971 A1 and the WO2019/120900A1 famous.
  • Such projectors work with very short focal lengths and therefore require little installation space.
  • Microprojection light modules that function according to the so-called fly's eye principle are of particular interest in connection with the present invention. These projectors can homogenize a non-homogeneous light distribution, which is desirable for many image projections (cf. DE 10 2017 217 345B4 , DE 10 2006 047 941 A1 ).
  • the object of the invention is to specify a motor vehicle lighting device of the type mentioned at the outset that enables tolerance-insensitive image projections with micro-projection light modules of small overall depth without cost-intensive processes and without complex readjustment of the lenses relative to one another.
  • a further object consists in specifying a method for producing such a motor vehicle lighting device.
  • the motor vehicle lighting device is characterized in that the diaphragm layer is arranged directly on the light entry surface and adheres to the entry lens surface.
  • the panel can be applied, for example, by metallization or painting. This has the advantage that due to the low thickness of the layer, the entire aperture can be imaged sharply and no light components can be seen through an extended metallic aperture realized as an insert (cf. DE102016112617B3 or WO2015/058227A1 ) are blocked.
  • the contour and position of the light-transmitting areas of the diaphragm layer can be changed more easily after the production process of the micro-projection optics, since the diaphragm is not permanently installed in the micro-projection optics.
  • a preferred embodiment is characterized in that the diaphragm layer has a light-transmissive partial area and an almost opaque one has sub-area.
  • An opaque sub-area is understood to be a sub-area whose transmission is less than 1%.
  • the light entry surface is an entry lens surface and that the focal lengths of the entry lens surface and the exit lens surface are almost identical.
  • the distance between the exit surface of a microprojector and the entry surface of the microprojector corresponds almost to the focal length of the entry lens surface or the exit lens surface. Due to these features, the thin aperture layer is imaged sharply, which is particularly beneficial for creating sharp light-dark boundaries.
  • a further preferred configuration is characterized in that the micro-projection optical element is a one-piece cohesive element. This results in particular in precise positioning of the light entry surface with the diaphragm layer in relation to the lens exit surface to a certain extent automatically and without the need for further positioning measures.
  • a total light entry surface of the microprojection optical element formed by the sum of the light entry surfaces of the microprojectors has a central, inner Area of the micro-projection optical element forms, which is surrounded by an outer edge region which is opaque. The opacity of the outer edge area prevents light from the light source emanating from the attachment optics from passing the lateral edges of the micro-projection optics and impairing the desired light distribution as undesired scattered light.
  • micro-projection light modules micro-projection optics plus associated attachment optics and light sources
  • micro-projection optics plus associated attachment optics and light sources are arranged next to one another transversely to their optical axes.
  • an animation effect for example a running light effect
  • a further preferred configuration is characterized in that the micro-projection light modules arranged next to one another differ in their focal length, the number of their micro-projectors and their aperture shape and/or their aperture size of their micro-projection optical elements.
  • the light distribution to be generated by the motor vehicle lighting device can be designed by a corresponding Determine the selection of the parameters mentioned.
  • micro-projection optics elements arranged next to one another are parts of a one-piece cohesively cohesive arrangement of micro-projection optics elements. It is also preferred that optical attachments arranged next to one another are parts of an arrangement of optical attachments that is coherent in one piece and cohesively with one another. The advantage of eliminating positioning measures also results from these two configurations.
  • a further preferred configuration is characterized in that each of the microprojectors has an optical axis, with at least most of the microprojectors being arranged in such a way that their optical axes run parallel to one another and that at least two of most of the microprojectors have entry lens surfaces and/or offset to one another along their optical axes. or have exit lens surfaces.
  • the height and width of the light entry surfaces and the exit lens surfaces of the microprojectors are not all the same. With the same shape and size of the translucent areas of the Aperture layer makes it possible to vary the light intensity in the projected image.
  • the light entry surfaces are flat surfaces and are therefore not implemented as concentrating light entry lens surfaces. As a result, tolerances between light entry surfaces and exit lens surfaces can be reduced.
  • a preferred embodiment of the method is characterized in that, in a first step, the micro-projection optical element is produced with its light entry surface and its light exit surface, that in a second step the light entry surface of the microprojectors is coated with a metal layer or lacquer layer, and that in a third step the translucent areas are exposed by ablation with a laser.
  • the exposure of the light-transmitting areas with the laser enables high precision of the diaphragm contour and diaphragm position and individual design of the diaphragm layer after the micro-projection optical element has been produced, for example by injection molding.
  • the application of the diaphragm layer and the positioning of the light-transmitting areas can take place directly after the end of the injection molding step. It is also advantageous that the same micro-projection optics can be provided with different screens, which makes them ideal for use in a wide variety of headlights and for a wide variety of applications. In this way, the number of identical parts that can be used in different headlights is increased, which advantageously reduces costs. It is also advantageous that a simpler change of the contour and position of the light-transmitting areas of the diaphragm layer of the image is possible after the manufacturing process of the micro-projection optics, since the diaphragm is not permanently installed in the micro-projection optics.
  • FIG 1 a sectional view of a motor vehicle lighting device 10 with a housing whose light exit opening is covered by a transparent cover plate 14.
  • a micro-projection light module 16 is arranged in the interior of the housing 12 and has a light source 18 , an optical attachment 20 and a micro-projection optics element 22 .
  • the light source 18 is preferably a semiconductor light source with which the light 19 can be emitted in the direction of the optical attachment 10 .
  • FIG figure 2 shows a perspective view of the micro-projection light module 16 from FIG figure 1 .
  • That Micro-projection light module 16 has a multiplicity of micro-projectors 28 arranged in rows 24 and columns 26 .
  • FIG 3 shows a longitudinal section through a single micro-projector 28 of the micro-projection light module.
  • Each individual micro-projector 28 has a light entry surface 30 , an aperture layer 32 and an exit lens surface 34 .
  • the diaphragm layer 32 is arranged directly on the light entry surface 30 and adheres to the light entry surface 30 .
  • the screen layer 32 has a light-transmitting portion 36 and an almost opaque portion 38 .
  • the light entry surface 30 is at the in the figure 3 microprojector 28 shown has an entrance lens surface which is convexly curved.
  • the exit lens surface 34 is also a convexly curved lens surface.
  • the focal lengths of the entry lens surface and the exit lens surface 34 on the microprojector side are almost identical, which means here that the smaller of the two focal lengths is greater than 90% of the larger of the two focal lengths, in particular greater than 95% of the larger of the two focal lengths.
  • Light entry surfaces 30 of the microprojectors 28 can also be implemented as flat surfaces in a simplified configuration.
  • the distance between the exit lens surface 34 and the light entry surface 30 of the microprojector 28 corresponds almost to the focal length of the exit lens surface 34, which should also mean here that the smaller of the two lengths (distance, focal length) is greater than 90% of the greater of the two lengths, in particular greater than 95% is the greater of the two lengths.
  • the exit lens surface forms the pattern of opaque partial area 38 and transparent partial area 36 sharply.
  • the light from the light source is almost collimated by the attachment optics (e.g. TIR optics or converging lenses) and illuminates the micro-projection optics, which projects the light onto the road.
  • the attachment optics e.g. TIR optics or converging lenses
  • the nearly collimated light that hits the micro-projection optics is reflected, scattered and/or completely or partially absorbed by the opaque partial areas of the diaphragm.
  • Light passing through the transparent portions of the diaphragm is focused by the entrance lens surface onto the exit lens surface and projected onto the road.
  • the intensity at a point of the light distribution results from the sum of the intensities that each micro-projector generates at this point.
  • figure 4 shows a plan view of the entire light entry surface 40 of a micro-projection optical element 22, the light entry surface 40 not yet being covered with the diaphragm layer.
  • figure 4 shows in particular that the micro-projection optics element 22 is a one-piece cohesive element which has light entry lenses which, to a certain extent, touch directly and thus adjoin one another without a gap. This applies to all exemplary embodiments.
  • the sum of the light entry areas of the micro-projectors forms a total light entry area of the micro-projection optical element 22.
  • those in FIG figure 4 light exit lenses concealed by the micro-projection optical element 22 touch one another directly and thus without a gap. This also applies to all exemplary embodiments.
  • the sum of the exit lens surfaces of the microprojectors 22 forms a coherent total light exit lens surface of the micro-projection optical element 22.
  • figure 5 shows a plan view of a micro-projection optical element, in which the of the sum of Light entry surfaces of the microprojectors 28 formed total light entry surface of the micro-projection optics element 22 forms a central region of the micro-projection optics element 22, which is surrounded by an outer edge region 42, which is opaque.
  • the opacity can result, for example, as a result of covering the edge area 42 with an opaque layer.
  • figure 6 shows an arrangement of a plurality of micro-projection light modules 16, each having an optical axis 44 and which are arranged side by side without a gap.
  • the optical axis 44 of a micro-projection light module 16 is parallel to the optical axes of its micro-projectors 28.
  • At least most of the micro-projectors 28 of the entire arrangement are arranged such that their optical axes are parallel to one another and that at least two of most of the micro-projectors 28 are along their optical axes have entry lens surfaces and/or exit lens surfaces arranged offset to one another.
  • micro-projection light modules 16 arranged next to one another can differ from one another in the number of their micro-projectors, their focal length and their aperture shape and/or aperture size of their micro-projection optical elements.
  • the micro-projection optical elements 22 arranged next to one another are parts of a one-piece, cohesively coherent arrangement 46 of micro-projection optics elements 22.
  • the attachment optics 20 arranged side by side in each case belonging to the micro-projection optics 22 are parts of a one-piece, cohesively cohesive arrangement 48 of attachment optics 20.
  • the arrangement of the micro-projectors does not necessarily have to be cuboid. It can be advantageous to arrange the microprojectors on a curved surface. It can be advantageous to use several attachment optics and light sources. The number of micro-projectors per line, the height or the focal length of the lens can also vary spatially with this design.
  • figure 7 shows the arrangement from the figure 6 from the beginning.
  • figure 8 shows a side view of one of the arrangement from the figures 6 and 7 comparable arrangement.
  • a difference between the objects of figures 6 and 7 on the one hand and the figure 8 on the other hand is that the height and width of the light entrance surfaces and the exit lens surfaces of the microprojectors in the subject of figure 8 not all are equal while they are the subject of figures 6 and 7 are all the same.
  • figure 9 illustrates a method for producing a motor vehicle lighting device according to the invention.
  • the method is characterized in particular by the fact that the diaphragm layer 32 is produced as a diaphragm layer 32 adhering directly to the light entry surface 30 and to the entry lens surface.
  • the micro-projection optical element 22 with its Light entry surface 40 and its light exit surface made.
  • the production takes place, for example, by injection molding.
  • the entire light entry surface 40 of the microprojectors, ie the microprojection optics element 22 is covered with a diaphragm layer 32.
  • the diaphragm layer 32 is therefore initially a continuous layer covering the entire light entry surface 40.
  • the material thickness of the screen layer is so great that the screen layer is almost opaque (transmission less than 1%).
  • the screen layer is preferably a metal layer or a lacquer layer. If the micro-projection optics element 22 also has an edge region 42 surrounding the central region in addition to the central region, this is preferably also covered with the opaque layer and thereby becomes opaque.
  • the light-transmitting partial regions 36 are uncovered by ablation using a laser.
  • lithographic processes and etching techniques can also be used to create the pattern of light-transmitting portions of the screen layer required to create a desired light distribution.
  • ablation by laser beams is more precise and much more flexible than etching techniques in terms of changing the pattern, since such a change only requires reprogramming of the laser beam control.
  • figure 10 shows a micro projection optical element after the injection molding step with not yet coated light entry surface.
  • figure 11 shows the micro-projection optical element after the coating that takes place in the second step and the exposure of the desired light-transmitting partial regions 36 that takes place in the third step.
  • the transparent sub-areas can also be produced by selectively applying the opaque sub-areas (e.g. with a mask, pad printing).

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
EP21201366.8A 2020-10-09 2021-10-07 Dispositif d'éclairage de véhicule automobile pourvu d'au moins un module lumineux de microprojection et son procédé de fabrication Active EP3982037B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020126592.1A DE102020126592A1 (de) 2020-10-09 2020-10-09 Kraftfahrzeugbeleuchtungseinrichtung mit wenigstens einem Mikroprojektionslichtmodul und Verfahren zu seiner Herstellung

Publications (2)

Publication Number Publication Date
EP3982037A1 true EP3982037A1 (fr) 2022-04-13
EP3982037B1 EP3982037B1 (fr) 2024-01-10

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EP21201366.8A Active EP3982037B1 (fr) 2020-10-09 2021-10-07 Dispositif d'éclairage de véhicule automobile pourvu d'au moins un module lumineux de microprojection et son procédé de fabrication

Country Status (3)

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EP (1) EP3982037B1 (fr)
CN (1) CN114321832A (fr)
DE (1) DE102020126592A1 (fr)

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006047941A1 (de) 2006-10-10 2008-04-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zur Homogenisierung von Strahlung mit nicht regelmäßigen Mikrolinsenarrays
WO2014164792A1 (fr) * 2013-03-12 2014-10-09 Lpi-Europe, S.L. Luminaire mince
WO2015058227A1 (fr) 2013-10-25 2015-04-30 Zizala Lichtsysteme Gmbh Module d'éclairage à micro-projection destiné à un projecteur de véhicule automobile
DE102016112617B3 (de) 2016-07-08 2017-10-26 Automotive Lighting Reutlingen Gmbh Kraftfahrzeugscheinwerfer mit geringer Bautiefe
EP3282181A1 (fr) 2016-07-29 2018-02-14 ZKW Group GmbH Lentille micro-optique sur verre présentant un conception de protection et procédé de fabrication
EP3312501A1 (fr) * 2016-10-19 2018-04-25 HELLA GmbH & Co. KGaA Dispositif d'eclairage pour véhicules
DE102017112971A1 (de) 2017-06-13 2018-12-13 Automotive Lighting Reutlingen Gmbh Kraftfahrzeugscheinwerfer mit wenigstens zwei Ausgangsteillinsen aufweisenden Mikroprojektionsmodulen
WO2019120900A1 (fr) 2017-12-20 2019-06-27 Zkw Group Gmbh Dispositif de projection pour phare de véhicule automobile et procédé de fabrication d'un dispositif de projection
DE102017217345B4 (de) 2017-09-28 2019-12-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Optischer Strahlformer
EP3633262A1 (fr) * 2018-10-04 2020-04-08 ZKW Group GmbH Dispositif de projection pour un module de phare de véhicule automobile et procédé de fabrication d'un dispositif de projection
CN215174752U (zh) * 2020-08-13 2021-12-14 Sl株式会社 车辆用灯具

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006047941A1 (de) 2006-10-10 2008-04-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zur Homogenisierung von Strahlung mit nicht regelmäßigen Mikrolinsenarrays
WO2014164792A1 (fr) * 2013-03-12 2014-10-09 Lpi-Europe, S.L. Luminaire mince
WO2015058227A1 (fr) 2013-10-25 2015-04-30 Zizala Lichtsysteme Gmbh Module d'éclairage à micro-projection destiné à un projecteur de véhicule automobile
DE102016112617B3 (de) 2016-07-08 2017-10-26 Automotive Lighting Reutlingen Gmbh Kraftfahrzeugscheinwerfer mit geringer Bautiefe
EP3282181A1 (fr) 2016-07-29 2018-02-14 ZKW Group GmbH Lentille micro-optique sur verre présentant un conception de protection et procédé de fabrication
EP3312501A1 (fr) * 2016-10-19 2018-04-25 HELLA GmbH & Co. KGaA Dispositif d'eclairage pour véhicules
DE102017112971A1 (de) 2017-06-13 2018-12-13 Automotive Lighting Reutlingen Gmbh Kraftfahrzeugscheinwerfer mit wenigstens zwei Ausgangsteillinsen aufweisenden Mikroprojektionsmodulen
DE102017217345B4 (de) 2017-09-28 2019-12-24 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Optischer Strahlformer
WO2019120900A1 (fr) 2017-12-20 2019-06-27 Zkw Group Gmbh Dispositif de projection pour phare de véhicule automobile et procédé de fabrication d'un dispositif de projection
EP3633262A1 (fr) * 2018-10-04 2020-04-08 ZKW Group GmbH Dispositif de projection pour un module de phare de véhicule automobile et procédé de fabrication d'un dispositif de projection
CN215174752U (zh) * 2020-08-13 2021-12-14 Sl株式会社 车辆用灯具

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Publication number Publication date
DE102020126592A1 (de) 2022-04-14
CN114321832A (zh) 2022-04-12
EP3982037B1 (fr) 2024-01-10

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