WO2021244735A1 - Headlamp for a motor vehicle - Google Patents

Headlamp for a motor vehicle Download PDF

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Publication number
WO2021244735A1
WO2021244735A1 PCT/EP2020/065269 EP2020065269W WO2021244735A1 WO 2021244735 A1 WO2021244735 A1 WO 2021244735A1 EP 2020065269 W EP2020065269 W EP 2020065269W WO 2021244735 A1 WO2021244735 A1 WO 2021244735A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
headlamp
headlamp according
exit surface
optical component
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.)
Ceased
Application number
PCT/EP2020/065269
Other languages
French (fr)
Inventor
Dmitry Fedosik
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.)
Hella GmbH and Co KGaA
Original Assignee
Hella GmbH and Co KGaA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hella GmbH and Co KGaA filed Critical Hella GmbH and Co KGaA
Priority to EP20732133.2A priority Critical patent/EP4162194B1/en
Priority to CN202080101699.4A priority patent/CN115667790A/en
Priority to PCT/EP2020/065269 priority patent/WO2021244735A1/en
Publication of WO2021244735A1 publication Critical patent/WO2021244735A1/en
Priority to US18/061,329 priority patent/US12025283B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F21S41/10—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]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • 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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • 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
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
    • 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
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention concerns a headlamp for a motor vehicle according to the pre amble of claim 1 .
  • a headlamp of the aforementioned type is known from DE 10 2016 109 147 A1 .
  • the headlamp described therein comprises a plurality of first light-emitting diodes (LEDs) for a high beam and a plurality of second light-emitting diodes for a low beam.
  • the light-emitting diodes can be individually controlled to adapt the generated light distribu tion to the traffic situation, e.g. to avoid dazzling an oncoming vehicle.
  • the headlamp also comprises a first light guide for the light emitted by the first light-emitting diodes and a second light guide for the light emitted by the second light-emitting diodes.
  • the first and the second light guide are arranged separately from each other on a cooling and support body, the second light guide being arranged above the first light guide and further back in the direction of light propagation than the first light guide.
  • the cool ing and support body is L-shaped, the first light guide being attached to a first of the L- limbs and the second light guide to a second of the L-limbs.
  • the headlamp further comprises a lens through which the light emerging from the light exit surfaces of the first and second light guides passes.
  • a disadvantage of such a headlamp is its complex design and the comparatively large overall depth of the headlamp.
  • the problem underlying the present invention is the creation of a headlamp of the type mentioned above, which is simpler and/or requires less space.
  • the headlamp comprises an optical component, in particular a monolithic optical component, which comprises both the first and the second light guide.
  • the headlamp comprises an optical component, in particular a monolithic optical component, which comprises both the first and the second light guide.
  • This design allows the overall depth of the headlamp to be shortened. Further more, it results in easier assembly, especially because components can be integrated into each other. In addition, a reduction in weight can be achieved.
  • the optical component has a light exit surface formed by the light exit surfaces of the first and second light guides.
  • the light exit sur faces of the first and second light guides are adjacent to and/or merge into one an other. The optical component thus contributes both to the generation of the high beam and the low beam.
  • the headlamp may comprise means for generating a horizontal cut-off line.
  • the first light exit surface may be inclined to the second light exit surface. This makes it possible to ensure that the high beam and low beam are superimposed in the area of the horizontal cut-off.
  • the optical component serves as a primary optics.
  • the optical component may have at least one collimating lens which is inte grated in particular in the light exit surface of the optical component.
  • the efficiency of the headlamp can be in creased.
  • the exit surfaces of the light guides each have a collimating lens. In particular, these can be inclined relative to one another, which makes it possible to achieve that the high beam and the low beam are superim posed on one another in the area of the cut-off line.
  • the light exit surface of the optical component has a structuring.
  • the structuring the emerging light can be homogenized, which in particular avoids un desired local intensity maxima on components arranged behind the component.
  • the light entry surfaces are formed by the ends of light guide elements projecting from the component. These light guide elements, for example fin ger-shaped or trunk-shaped, can effectively receive the light emitted by the individual light sources and couple it into the optical component.
  • the first and/or the second light sources individually or in indi vidual groups.
  • the light distribution produced by the headlamp can be adapted to the traffic situation, e.g. to avoid dazzling an oncoming vehicle.
  • the light sources are designed as light-emitting diodes which are arranged in particular on a common circuit board.
  • the arrangement of the light- emitting diodes on a common circuit board also contributes to making the headlamp more compact.
  • the light sources it is possible for the light sources to be arranged in a plane, in particular the arrange ment of the light sources corresponding to the contour of the cut-off line.
  • the light sources of the high beam and low beam are therefore not offset from each other in the direction of light propagation, which also results in a more compact design.
  • the headlamp has a secondary optics through which the light emerging from the light exit surfaces of the first and/or the second light guide passes during operation of the headlamp.
  • the secondary optics may have a collimating lens which is adapted, in particular with respect to its cutting width, to the at least one colli mating lens of the optical component serving as a primary optics. By adjusting the cut ting width of the collimating lenses of the primary and secondary optics, the collimation is effectively divided between the primary and secondary optics, so that the desired ef fect can be achieved with less effort.
  • the secondary optics have a structuring which is arranged in particu lar on the collimating lens. By structuring the secondary optics, any artifacts generated by the structuring of the primary optics can be minimized.
  • Fig. 1 a perspective view of components of a headlamp of the invention
  • Fig. 2 a side view of the primary optics of the headlamp as shown in Fig. 1 ;
  • Fig. 3 a front view of the primary optics of the headlamp as shown in Fig. 1 ;
  • Fig. 4 a rear view of the primary optics of the headlamp as shown in Fig. 1.
  • the illustrated version of a headlamp according to the invention comprises an un shown circuit board on which a plurality of light sources in the form of light-emitting di odes (LEDs) are arranged.
  • LEDs light-emitting di odes
  • both several first light sources designed as light-emitting diodes for a high beam and several second light sources designed as light-emitting diodes for a low beam are arranged on the board.
  • the light sources can be controlled separately to switch between low beam and high beam. It is also possible to implement other functions of an adaptive front lighting sys tem by varying the power supply to the light sources, such as city lights, country lights or motorway lights. It is also possible to control the first and/or second light sources in dividually or in groups. In this way, the light distribution generated by the headlamp can be adapted to the traffic situation, e.g. to avoid dazzling an oncoming vehicle.
  • the illustrated design of a headlamp according to the invention further comprises an optical component 1 serving as a primary optics, in particular a monolithic optical com ponent 1 , and a secondary optics 2.
  • an optical component 1 serving as a primary optics, in particular a monolithic optical com ponent 1
  • a secondary optics 2 During operation of the headlamp, the light emit ted by the light sources passes first through the primary optics and then through the secondary optics 2 (see Fig. 1).
  • the optical component 1 which serves as primary optics, comprises a first light guide 3 for the high beam and a second light guide 4 for the low beam (see Fig. 2).
  • the light guides 3, 4 each have several light entry surfaces 5, 6 on their left side shown in Fig.
  • the light guides 3, 4 each have a light exit surface 7, 8 through which the light emerges.
  • the light guides 3, 4 each have a plurality of light guide elements 9, 10 which protrude from the light guides 3, 4 (see Fig. 2 and Fig. 3).
  • the ends of the light guide elements 9, 10 facing away from the light guides 3, 4 form the light entry surfaces 5, 6.
  • the light guide elements 9, 10 are essentially finger shaped or trunk shaped.
  • Fig. 2 illustrates that each of the light exit surfaces 7, 8 is curved so that two collimat ing lenses 11 , 12 are formed on the optical component 1 serving as primary optics, each of which is assigned to one of the light guides 3, 4. These collimating lenses 11 , 12 are inclined relative to one another, whereby it can be achieved that the high beam and low beam are superimposed on one another in the region of the cut-off line.
  • the efficiency of the headlamp can be increased by integrating at least one collimating lens 11 , 12 in the optical component 1.
  • the illustrated version of the secondary optics 2 also comprises a collimating lens 13, which is designed as a biconvex lens, for example (see Fig. 1). It is also possible to design the collimating lens 13 differently, for example as a plano-convex lens.
  • the cut ting width of the collimating lens 13 of the secondary optics 2 is adapted to the cutting widths of the collimating lenses 11 , 12 of the primary optics.
  • the illustrated design of a headlamp according to the invention further comprises an unshown housing in or on which the optical component 1 serving as primary optics with the circuit board, the secondary optics 2 and a likewise unshown heat sink for the light emitting diodes arranged on the circuit board can be mounted.
  • Fig. 4 illustrates that the light exit surface 8 of the second light guide 4 has a structur ing 14. It is certainly possible to also provide the light exit surface 7 of the first light guide 3 at least partially with this or a comparable structuring 14.
  • the structuring 14 can be designed as a prism array, for example. The structuring 14 homogenizes the light emerging from the light exit surface 8 at least to such an extent that no undesired intensity maxima occur on the secondary optics 2 and/or an unshown cover glass.
  • the structuring 14 is recessed in a middle area 15.
  • the light can pass through this re Switchd area 15 relatively unhindered, so that higher light intensities can be achieved.
  • the collimating lens 13 of secondary optics 2 is also provided with an un shown structuring. This structuring of the secondary optics 2 can minimize artifacts generated by the structuring 14 of the primary optics.
  • Fig. 3 illustrates that eleven light entry surfaces 5 of the first light guide 3 and ten light entry surfaces 6 of the second light guide 4 are provided, each formed by the distal end of a light guide elements 9, 10. If a light source, for example in the form of a light- emitting diode, is arranged in front of each of the light entry surfaces 5, 6, eleven light sources for the high beam and ten light sources for the low beam would be provided.
  • a light source for example in the form of a light- emitting diode
  • Fig. 3 illustrates that the light entry surfaces 5 of the first light guide 3 each have es sentially the same shape and size. Furthermore, it can be seen that the light entry sur faces 6 of the second light guide 4 each have essentially the same shape and size.
  • the light entry surfaces 5, 6 and thus also the light sources arranged in front of them have a vertical offset 16 in a central area.
  • This offset 16 follows the contour 17 of the horizontal cut-off line drawn in Fig. 3 for clarification.

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

Abstract

Headlamp for a motor vehicle, comprising a plurality of first light sources for a high beam, emitting light during operation of the headlamp, a plurality of second light sources for a low beam, emitting light during operation of the headlamp, a first light guide (3) having a plurality of light entry surfaces (5) for the light emitted from the first light sources and a first light exit surface (7), a second light guide (4) having a plurality of light entry surfaces (6) for the light emitted from the second light sources and a second light exit surface (8), wherein the headlamp comprises an optical component (1), in particular a monolithic optical component, which comprises both the first and the second light guide (3, 4).

Description

Headlamp for a motor vehicle
Description
The present invention concerns a headlamp for a motor vehicle according to the pre amble of claim 1 .
A headlamp of the aforementioned type is known from DE 10 2016 109 147 A1 . The headlamp described therein comprises a plurality of first light-emitting diodes (LEDs) for a high beam and a plurality of second light-emitting diodes for a low beam. The light-emitting diodes can be individually controlled to adapt the generated light distribu tion to the traffic situation, e.g. to avoid dazzling an oncoming vehicle. The headlamp also comprises a first light guide for the light emitted by the first light-emitting diodes and a second light guide for the light emitted by the second light-emitting diodes. The first and the second light guide are arranged separately from each other on a cooling and support body, the second light guide being arranged above the first light guide and further back in the direction of light propagation than the first light guide. The cool ing and support body is L-shaped, the first light guide being attached to a first of the L- limbs and the second light guide to a second of the L-limbs. The headlamp further comprises a lens through which the light emerging from the light exit surfaces of the first and second light guides passes.
A disadvantage of such a headlamp is its complex design and the comparatively large overall depth of the headlamp.
The problem underlying the present invention is the creation of a headlamp of the type mentioned above, which is simpler and/or requires less space.
This is achieved, in accordance with the invention, by means of a headlamp of the aforementioned kind with the characterizing features of claim 1 . The subclaims con cern preferred forms of the invention. Claim 1 provides that the headlamp comprises an optical component, in particular a monolithic optical component, which comprises both the first and the second light guide. This design allows the overall depth of the headlamp to be shortened. Further more, it results in easier assembly, especially because components can be integrated into each other. In addition, a reduction in weight can be achieved.
It may be provided that the optical component has a light exit surface formed by the light exit surfaces of the first and second light guides. In particular, the light exit sur faces of the first and second light guides are adjacent to and/or merge into one an other. The optical component thus contributes both to the generation of the high beam and the low beam.
The headlamp may comprise means for generating a horizontal cut-off line.
In particular, the first light exit surface may be inclined to the second light exit surface. This makes it possible to ensure that the high beam and low beam are superimposed in the area of the horizontal cut-off.
It may be intended that the optical component serves as a primary optics.
Preferably, the optical component may have at least one collimating lens which is inte grated in particular in the light exit surface of the optical component. By integrating a collimating lens into the primary optics, the efficiency of the headlamp can be in creased. In particular, it may be provided that the exit surfaces of the light guides each have a collimating lens. In particular, these can be inclined relative to one another, which makes it possible to achieve that the high beam and the low beam are superim posed on one another in the area of the cut-off line.
It is possible that the light exit surface of the optical component has a structuring. By the structuring, the emerging light can be homogenized, which in particular avoids un desired local intensity maxima on components arranged behind the component. It may be provided that the light entry surfaces are formed by the ends of light guide elements projecting from the component. These light guide elements, for example fin ger-shaped or trunk-shaped, can effectively receive the light emitted by the individual light sources and couple it into the optical component.
It is possible to control the first and/or the second light sources individually or in indi vidual groups. In this way, the light distribution produced by the headlamp can be adapted to the traffic situation, e.g. to avoid dazzling an oncoming vehicle.
It may be provided that the light sources are designed as light-emitting diodes which are arranged in particular on a common circuit board. The arrangement of the light- emitting diodes on a common circuit board also contributes to making the headlamp more compact.
It is possible for the light sources to be arranged in a plane, in particular the arrange ment of the light sources corresponding to the contour of the cut-off line. In contrast to the state of the art, the light sources of the high beam and low beam are therefore not offset from each other in the direction of light propagation, which also results in a more compact design. By arranging the light sources according to the contour of the cut-off line to be produced, the legally required contour is easier to realise.
It may be provided that the headlamp has a secondary optics through which the light emerging from the light exit surfaces of the first and/or the second light guide passes during operation of the headlamp. The secondary optics may have a collimating lens which is adapted, in particular with respect to its cutting width, to the at least one colli mating lens of the optical component serving as a primary optics. By adjusting the cut ting width of the collimating lenses of the primary and secondary optics, the collimation is effectively divided between the primary and secondary optics, so that the desired ef fect can be achieved with less effort. It is possible that the secondary optics have a structuring which is arranged in particu lar on the collimating lens. By structuring the secondary optics, any artifacts generated by the structuring of the primary optics can be minimized.
The invention is explained in more detail below on the basis of the attached drawings. And shows
Fig. 1 a perspective view of components of a headlamp of the invention;
Fig. 2 a side view of the primary optics of the headlamp as shown in Fig. 1 ;
Fig. 3 a front view of the primary optics of the headlamp as shown in Fig. 1 ;
Fig. 4 a rear view of the primary optics of the headlamp as shown in Fig. 1.
In the figures, identical and functionally identical parts are marked with identical refer ence symbols.
The illustrated version of a headlamp according to the invention comprises an un shown circuit board on which a plurality of light sources in the form of light-emitting di odes (LEDs) are arranged. In this case, both several first light sources designed as light-emitting diodes for a high beam and several second light sources designed as light-emitting diodes for a low beam are arranged on the board.
It is possible to use other light sources instead of the light-emitting diodes. For exam ple, semiconductor lasers could also be used as light sources.
The light sources can be controlled separately to switch between low beam and high beam. It is also possible to implement other functions of an adaptive front lighting sys tem by varying the power supply to the light sources, such as city lights, country lights or motorway lights. It is also possible to control the first and/or second light sources in dividually or in groups. In this way, the light distribution generated by the headlamp can be adapted to the traffic situation, e.g. to avoid dazzling an oncoming vehicle.
The illustrated design of a headlamp according to the invention further comprises an optical component 1 serving as a primary optics, in particular a monolithic optical com ponent 1 , and a secondary optics 2. During operation of the headlamp, the light emit ted by the light sources passes first through the primary optics and then through the secondary optics 2 (see Fig. 1).
The optical component 1 , which serves as primary optics, comprises a first light guide 3 for the high beam and a second light guide 4 for the low beam (see Fig. 2). The light guides 3, 4 each have several light entry surfaces 5, 6 on their left side shown in Fig.
2, into which the light of the light-emitting diodes is coupled when the headlamp is in operation. On the right hand side shown in Fig. 2 the light guides 3, 4 each have a light exit surface 7, 8 through which the light emerges.
The light guides 3, 4 each have a plurality of light guide elements 9, 10 which protrude from the light guides 3, 4 (see Fig. 2 and Fig. 3). The ends of the light guide elements 9, 10 facing away from the light guides 3, 4 form the light entry surfaces 5, 6. The light guide elements 9, 10 are essentially finger shaped or trunk shaped.
Fig. 2 illustrates that each of the light exit surfaces 7, 8 is curved so that two collimat ing lenses 11 , 12 are formed on the optical component 1 serving as primary optics, each of which is assigned to one of the light guides 3, 4. These collimating lenses 11 , 12 are inclined relative to one another, whereby it can be achieved that the high beam and low beam are superimposed on one another in the region of the cut-off line. The efficiency of the headlamp can be increased by integrating at least one collimating lens 11 , 12 in the optical component 1.
The illustrated version of the secondary optics 2 also comprises a collimating lens 13, which is designed as a biconvex lens, for example (see Fig. 1). It is also possible to design the collimating lens 13 differently, for example as a plano-convex lens. The cut ting width of the collimating lens 13 of the secondary optics 2 is adapted to the cutting widths of the collimating lenses 11 , 12 of the primary optics.
The illustrated design of a headlamp according to the invention further comprises an unshown housing in or on which the optical component 1 serving as primary optics with the circuit board, the secondary optics 2 and a likewise unshown heat sink for the light emitting diodes arranged on the circuit board can be mounted.
Fig. 4 illustrates that the light exit surface 8 of the second light guide 4 has a structur ing 14. It is certainly possible to also provide the light exit surface 7 of the first light guide 3 at least partially with this or a comparable structuring 14. The structuring 14 can be designed as a prism array, for example. The structuring 14 homogenizes the light emerging from the light exit surface 8 at least to such an extent that no undesired intensity maxima occur on the secondary optics 2 and/or an unshown cover glass.
The structuring 14 is recessed in a middle area 15. The light can pass through this re cessed area 15 relatively unhindered, so that higher light intensities can be achieved.
Furthermore, the collimating lens 13 of secondary optics 2 is also provided with an un shown structuring. This structuring of the secondary optics 2 can minimize artifacts generated by the structuring 14 of the primary optics.
Fig. 3 illustrates that eleven light entry surfaces 5 of the first light guide 3 and ten light entry surfaces 6 of the second light guide 4 are provided, each formed by the distal end of a light guide elements 9, 10. If a light source, for example in the form of a light- emitting diode, is arranged in front of each of the light entry surfaces 5, 6, eleven light sources for the high beam and ten light sources for the low beam would be provided.
Flowever, it is quite possible to provide more or less light entry surfaces 5, 6 or more or less light guide elements 9, 10 on both the first light guide 3 and the second light guide 4. Fig. 3 illustrates that the light entry surfaces 5 of the first light guide 3 each have es sentially the same shape and size. Furthermore, it can be seen that the light entry sur faces 6 of the second light guide 4 each have essentially the same shape and size.
The light entry surfaces 5, 6 and thus also the light sources arranged in front of them have a vertical offset 16 in a central area. This offset 16 follows the contour 17 of the horizontal cut-off line drawn in Fig. 3 for clarification.
List of reference symbols
1 Optical component
2 Secondary optics
3 First light guide
4 Second light guide
5 Light entry surface of the first light guide 3
6 Light entry surface of the second light guide 4
7 Light exit surface of the first light guide 3
8 Light exit surface of the second light guide 4
9 Light guide element of the first light guide 3
10 Light guide element of the second light guide 4
11 Collimating lens of the first light guide 3
12 Collimating lens of the second light guide 3
13 Collimating lens of the secondary optics 2
14 Structuring of the light exit surface 8
15 Recessed area of the structuring 14
16 Vertical offset of the light entry surfaces 5, 6
17 Contour of the horizontal cut-off line

Claims

1 Headlamp for a motor vehicle Claims
1. Headlamp for a motor vehicle, comprising
- a plurality of first light sources for a high beam, emitting light during op eration of the headlamp,
- a plurality of second light sources for a low beam, emitting light during operation of the headlamp, a first light guide (3) having a plurality of light entry surfaces (5) for the light emitted from the first light sources and a first light exit surface (7),
- a second light guide (4) having a plurality of light entry surfaces (6) for the light emitted from the second light sources and a second light exit surface (8), characterised in that the headlamp comprises an optical component (1), in particular a monolithic optical component, which comprises both the first and the second light guide (3, 4).
2. Headlamp according to claim 1 , characterized in that the optical compo nent (1 ) has a light exit surface formed by the light exit surfaces (7, 8) of the first and second light guides (3, 4).
3. Headlamp according to one of claims 1 or 2, characterised in that the light exit surfaces (7, 8) of the first and second light guides (3, 4) are adjacent to and/or merge into one another.
4. Headlamp according to any one of claims 1 to 3, characterized in that the headlamp comprises means for generating a horizontal cut-off line.
5. A headlamp according to any one of claims 1 to 4, characterized in that the first light exit surface (7) is inclined to the second light exit surface (8). 2
6. Headlamp according to any one of claims 1 to 5, characterized in that the optical component (1) serves as a primary optics.
7. Headlamp according to one of claims 1 to 6, characterized in that the opti cal component (1 ) has at least one collimating lens (11, 12) which is inte grated in particular in the light exit surface of the optical component (1).
8. Headlamp according to one of claims 1 to 7, characterised in that the light exit surface of the optical component (1) has a structuring (14).
9. Headlamp according to any one of claims 1 to 8, characterized in that the light entry surfaces (5, 6) are formed by the ends of light guide elements (9, 10) projecting from the component (1).
10. Headlamp according to any of claims 1 to 9, characterized in that the first and/or the second light sources can be controlled individually or in individual groups.
11. Headlamp according to one of claims 1 to 10, characterized in that the light sources are designed as light-emitting diodes which are arranged in particular on a common circuit board.
12. Headlamp according to one of claims 1 to 11 , characterized in that the light sources are arranged in one plane, in particular the arrangement of the light sources corresponding to the contour (17) of the cut-off line.
13. Headlamp according to any one of claims 1 to 12, characterized in that the headlamp has a secondary optics (2) through which the light emerging from the light exit surfaces (7, 8) of the first and/or the second light guide (3, 4) passes during operation of the headlamp. 3
14. Headlamp according to claim 13, characterized in that the secondary op tics (2) has a collimating lens (13) which is adapted, in particular with re spect to its cutting width, to the at least one collimating lens (11 , 12) of the optical component (1) serving as a primary optics.
15. Headlamp according to one of claims 13 or 14, characterized in that the secondary optics (2) have a structuring which is arranged in particular on the collimating lens (13).
PCT/EP2020/065269 2020-06-03 2020-06-03 Headlamp for a motor vehicle Ceased WO2021244735A1 (en)

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EP20732133.2A EP4162194B1 (en) 2020-06-03 2020-06-03 Headlamp for a motor vehicle
CN202080101699.4A CN115667790A (en) 2020-06-03 2020-06-03 Headlamps for motor vehicles
PCT/EP2020/065269 WO2021244735A1 (en) 2020-06-03 2020-06-03 Headlamp for a motor vehicle
US18/061,329 US12025283B2 (en) 2020-06-03 2022-12-02 Headlamp for a motor vehicle

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US20230095603A1 (en) 2023-03-30
EP4162194B1 (en) 2025-09-10
US12025283B2 (en) 2024-07-02
EP4162194A1 (en) 2023-04-12

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