EP3943807B1 - Dispositif d'éclairage pour un phare de véhicule automobile - Google Patents

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

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Publication number
EP3943807B1
EP3943807B1 EP20186703.3A EP20186703A EP3943807B1 EP 3943807 B1 EP3943807 B1 EP 3943807B1 EP 20186703 A EP20186703 A EP 20186703A EP 3943807 B1 EP3943807 B1 EP 3943807B1
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EP
European Patent Office
Prior art keywords
light
lighting device
temperature
light guide
length
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20186703.3A
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German (de)
English (en)
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EP3943807A1 (fr
Inventor
Gerhard HONAUER
Thomas Leinz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZKW Group GmbH
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ZKW Group GmbH
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 ZKW Group GmbH filed Critical ZKW Group GmbH
Priority to EP20186703.3A priority Critical patent/EP3943807B1/fr
Priority to KR1020210088792A priority patent/KR102588156B1/ko
Priority to CN202110818699.2A priority patent/CN113958920A/zh
Publication of EP3943807A1 publication Critical patent/EP3943807A1/fr
Application granted granted Critical
Publication of EP3943807B1 publication Critical patent/EP3943807B1/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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/29—Attachment 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
    • F21S41/10—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
    • F21S41/24—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
    • F21S41/10—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
    • 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
    • F21S41/60—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
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/10—Protection of lighting devices
    • 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

Definitions

  • the invention relates to a lighting device for a motor vehicle headlight.
  • the invention also relates to a motor vehicle headlight with a lighting device.
  • Lighting devices with optics that have light-guiding bodies are known in the prior art, with the light-guiding bodies often being made of relatively soft materials, such as silicone, for example. Due to the proximity of the light-guiding body to a light source of the lighting device, the light-guiding body heats up.
  • a lighting device with LED light sources and fiber-optic elements made of a polymer is, for example, in U.S. 2008/253144 A1 shown.
  • this heating leads to thermal expansion and thus to a change in the length of the light-guiding body, with the light-entry surfaces of the light-guiding body thereby being displaced in the direction of the illuminant.
  • the object of the present invention is to alleviate or eliminate the disadvantages of the prior art.
  • the invention therefore aims in particular to create a lighting device in which temperature-related changes in the light distribution are minimized.
  • the primary optics has compensating elements, which are arranged between several, in particular all, adjacent fiber-optic elements.
  • the distance between the light entry surface of each fiber optic body and the light source associated with the fiber optic body can be kept constant at the first and second temperatures and during the transition from the first to the second temperature.
  • the light is guided within the light-guiding body in particular by total reflection of the light beams on the inside of the light-guiding body.
  • the light guide bodies can be designed as transparent hollow bodies or solid bodies.
  • the light-guiding body can be designed as a light guide.
  • the compensating elements can essentially be designed as elongate bodies and can have a first end face and a second end face opposite the first, it being possible for an elongate body to extend between the two end faces.
  • the first end face can rest essentially between two light exit faces of two adjacent light guide bodies.
  • the second end face can rest against the holder between two openings.
  • the first and the second material are the same. This results in the advantage that the fiber-optic elements and the compensating elements have the same thermal properties.
  • first material and the second material have the same coefficient of thermal expansion.
  • the first and the second material can also have a different coefficient of thermal expansion.
  • the compensating elements and the light-guiding bodies preferably have essentially the same length.
  • the compensating elements preferably have a length which is shorter by the portion of the light-guiding body which protrudes through the opening.
  • the heat shield can be arranged between the openings. This results in the advantage that the holder and thus also the primary optics are better protected against the heat of the light sources.
  • the through openings and the openings are congruent.
  • the through-openings and/or the openings have a cross-section which essentially corresponds to the cross-section of the light-guiding body.
  • each through-opening is assigned to an opening in such a way that a light-conducting body protrudes through a through-opening and through the opening assigned to the through-opening.
  • the holder and the compensating elements can be designed in one piece.
  • the compensating elements can be produced integrally or in one piece with the holder during the production process of the holder.
  • the holder and the compensating elements are preferably connected to one another in a form-fitting manner.
  • the compensating elements can, for example, be produced integrally or in one piece together with the primary optics in the same injection molding process.
  • a motor vehicle headlight is provided with a lighting device as described above.
  • top In the context of this description, the terms “top”, “bottom”, “horizontal”, “vertical” are to be understood as indications of the orientation when the lighting device is arranged in the normal use position.
  • the lighting device 1 shows a detail of a vertical section of a lighting device 1 according to the invention for a motor vehicle headlight (for the sake of clarity, only a part of the entire device is shown, that part which contains the light-conducting bodies 4 and shows the compensating elements 7 in detail).
  • the lighting device 1 comprises a lighting means (not shown) for generating and radiating light, the lighting means having a plurality of light sources.
  • the lighting device 1 also includes primary optics 2 with a base body 3 and with a plurality of light guide bodies 4 protruding from the base body 3 for forming a desired light distribution from the light of the illuminant.
  • the fiber-optic elements 4 each have a light entry surface 4a and a light exit surface 4b, with each light entry surface 4a being assigned a light source of the illuminant, so that the light from a light source can be fed into the light entry surface 4a assigned to the light source.
  • the light entry surfaces 4a are preferably arranged in a uniform grid, in particular in rows and columns, and lying in the same plane.
  • the lighting device 1 comprises a holder 5 on which the base body 3 of the primary optics 2 is arranged, the holder 5 having a number of openings 6 corresponding to the number of light guide bodies 4 and corresponding to the light guide bodies 4 .
  • one light-guiding body 4 is assigned to an opening 6, with the openings 6 being set up to receive the light-guiding body 4 of the primary optics 2 and to hold it in position.
  • One fiber-optic element 4 in each case protrudes through an opening 6 associated with the corresponding fiber-optic element 4 in such a way that the light-entry surfaces 4a are each at a distance from the light sources.
  • at most 5% to 15%, preferably 10%, of the total length of a light-guiding body 4 protrudes through the opening associated with the light-guiding body 4 .
  • the fiber optics 4 are designed in such a way, in particular made of such a material, that the light entry surfaces 4a of the fiber optics 4 are at a first distance from the light sources at a first temperature of the primary optics 2 and at a second temperature of the primary optics 2 at a second distance.
  • the first temperature of the primary optics 2 is present when the light sources are switched off and the second temperature is present when the light sources are switched on.
  • the first distance is greater than the second distance and the first temperature is lower than the second temperature.
  • the difference between the first distance at the first temperature and the second distance at the second temperature defines a displacement length of the position of the light entry surfaces 4a relative to the light source assigned to the respective light entry surface 4a.
  • the primary optics 2 has compensating elements 7 which are arranged between several, in particular all, adjacent fiber-optic elements 4 .
  • the compensating elements 7 are arranged along an edge area of the primary optics 2 .
  • the compensating elements 7 extend essentially from the light exit surfaces 4b of the light-guiding body 4 to the area of the holder 5 on which the openings 6 are located, and rest against the holder 5 between the openings 6 .
  • the compensating elements 7 have a first length at the first temperature and a second length at the second temperature, the first length being smaller than the second length.
  • the compensating elements 7 are designed in such a way that they move the primary optics 2 together with the fiber-optic elements 4 in the direction of light propagation as a result of a temperature-related change in length of the compensating elements 7 .
  • the difference between the first length at the first temperature and the second length at the second temperature is equal to the shift length.
  • the compensating elements 7 are formed from a first material and the light-guiding bodies 4 are formed from a second material, with the first and the second material being the same in the exemplary embodiment shown and having the same coefficient of thermal expansion.
  • the compensating elements 7 and the fiber-optic elements 4 are made of silicone, for example.
  • the compensating elements 7 are cylindrical in cross section.
  • the fiber optics 4 are cuboid in cross section and taper from the light exit surface 4b toward the light entry surface 4a.
  • a heat shield 8 is arranged on a side of the holder 5 which faces the light sources.
  • the heat shield 8 has a number of through openings, the number of through openings in the heat shield 8 corresponding to the number of openings 6 in the holder 5 .
  • the through openings and the openings 6 are congruent.
  • the heat shield 8 is arranged on the holder 5 in such a way that each passage opening is assigned to an opening 6 in such a way that a light guide body 4 protrudes through a passage opening and the opening 6 assigned to the passage opening.

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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)

Claims (15)

  1. Dispositif d'éclairage (1) pour un projecteur de véhicule automobile, le dispositif d'éclairage (1) comprenant :
    - un moyen d'éclairage, pour générer et émettre de la lumière, le moyen d'éclairage présentant une pluralité de sources lumineuses,
    - une optique primaire (2) avec un corps de base (3) et avec plusieurs corps de guidage de lumière (4) faisant saillie du corps de base (3) pour former une distribution de lumière souhaitée à partir de la lumière du moyen d'éclairage, les corps de guidage de lumière (4) présentant chacun une surface d'entrée de lumière (4a) et une surface de sortie de lumière (4b), une source lumineuse du moyen d'éclairage étant associée à chaque surface d'entrée de lumière (4a) de telle sorte que la lumière d'une source lumineuse puisse être injectée dans la surface d'entrée de lumière (4a) associée à la source lumineuse, les surfaces d'entrée de lumière (4a) étant de préférence disposées selon une trame régulière, notamment en lignes et en colonnes, et situées dans le même plan,
    - un support (5) sur lequel est disposé le corps de base (3) de l'optique primaire (2), le support (5) présentant un nombre d'ouvertures (6) correspondant au nombre de corps de guidage de lumière (4) et correspondant aux corps de guidage de lumière (4), un corps de guidage de lumière (4) étant respectivement associé à une ouverture (6), les ouvertures (6) étant conçues pour recevoir et maintenir en position les corps de guidage de la lumière (4) de l'optique primaire (2), un corps de guidage de la lumière (4) dépassant à chaque fois à travers une ouverture (6) associée au corps de guidage de la lumière (4) correspondant, de telle sorte que les surfaces d'entrée de la lumière (4a) présentent à chaque fois un écart par rapport aux sources lumineuses,
    les corps de guidage de lumière (4) étant conçus, en particulier formés d'un matériau tel que les surfaces d'entrée de lumière (4a) des corps de guidage de lumière (4) présentent un premier écart par rapport aux sources de lumière à une première température de l'optique primaire (2) et un deuxième écart à une deuxième température de l'optique primaire (2),
    la première température de l'optique primaire (2) étant présente dans un état éteint des sources lumineuses et la deuxième température étant présente dans un état allumé des sources lumineuses,
    la première température étant inférieure à la deuxième température,
    caractérisé en ce que
    l'optique primaire (2) présente des éléments de compensation (7) qui sont disposés entre plusieurs, en particulier tous les corps de guidage de lumière (4) voisins et qui s'étendent depuis les surfaces de sortie de lumière (4b) des corps de guidage de lumière (4) vers la zone du support (5) sur laquelle se trouvent les ouvertures (6) et qui s'appliquent entre les ouvertures (6) sur le support (5) et sont en contact avec celui-ci, les éléments de compensation (7) présentant une première longueur à la première température et une deuxième longueur à la deuxième température, la première longueur étant inférieure à la deuxième longueur, les éléments de compensation (7) étant conçus de telle sorte que, en cas de changement de température de la première température (T1) à la deuxième température (T2), l'optique primaire (2) ainsi que les corps de guidage de lumière (4) sont déplacés dans la direction de propagation de la lumière par ce changement de longueur des éléments de compensation (7) dû à la température,
    sans cette modification de longueur des éléments de compensation (7) due à la température, la première distance serait supérieure à la deuxième distance et la différence entre la première distance et la deuxième distance définit ainsi une longueur de déplacement de la position de la surface d'entrée de lumière (4a) par rapport à la source lumineuse associée à la surface d'entrée de lumière (4) respective,
    la différence entre la première longueur à la première température et la deuxième longueur à la deuxième température étant égale à la longueur de déplacement.
  2. Dispositif d'éclairage (1) selon la revendication 1, dans lequel les éléments de compensation (7) sont formés d'un premier matériau et les surfaces de guidage de lumière (4) sont formées d'un deuxième matériau.
  3. Dispositif d'éclairage (1) selon la revendication 2, dans lequel le premier et le deuxième matériau sont identiques.
  4. Dispositif d'éclairage (1) selon la revendication 2 ou 3, dans lequel le premier matériau et le deuxième matériau ont le même coefficient de dilatation thermique.
  5. Dispositif d'éclairage (1) selon l'une quelconque des revendications précédentes, dans lequel les éléments de compensation (7) et les corps de guidage de lumière (4) sont réalisés en polymères synthétiques, par exemple en silicone.
  6. Dispositif d'éclairage (1) selon l'une des revendications précédentes, dans lequel les éléments de compensation (7) ont une section transversale cylindrique ou parallélépipédique.
  7. Dispositif d'éclairage (1) selon l'une des revendications précédentes, dans lequel les éléments de compensation (7) et les corps de guidage de lumière (4) présentent sensiblement la même longueur.
  8. Dispositif d'éclairage (1) selon l'une des revendications précédentes, dans lequel un écran thermique (8) est disposé sur un côté du support (5) qui est orienté vers les sources lumineuses.
  9. Dispositif d'éclairage (1) selon la revendication 8, dans lequel l'écran thermique (8) présente un nombre d'ouvertures de passage, le nombre d'ouvertures de passage dans l'écran thermique (8) correspondant au nombre d'ouvertures (6) dans le support (5).
  10. Dispositif d'éclairage (1) selon la revendication 9, dans lequel les ouvertures de passage et les ouvertures (6) coïncident.
  11. Dispositif d'éclairage (1) selon la revendication 9 ou 10, dans lequel le bouclier thermique (8) est disposé sur le support (5) de telle sorte que chaque ouverture de passage est respectivement associée à une ouverture (6) de telle sorte que chaque fois un corps de guidage de lumière (4) fait saillie à travers une ouverture de passage et à travers l'ouverture (6) associée à l'ouverture de passage.
  12. Dispositif d'éclairage (1) selon l'une des revendications précédentes, dans lequel au plus 5% à 15%, de préférence 10%, de la longueur totale du corps de guidage de lumière (4) dépasse à travers l'ouverture (6).
  13. Dispositif d'éclairage (1) selon l'une des revendications précédentes, dans lequel le support (5) et les éléments de compensation (7) sont formés d'une seule pièce.
  14. Dispositif d'éclairage (1) selon l'une quelconque des revendications précédentes, dans lequel l'optique primaire (2) et les éléments de compensation (7) sont formés d'une seule pièce.
  15. Projecteur de véhicule automobile comprenant un dispositif d'éclairage (1) selon l'une quelconque des revendications 1 à 14.
EP20186703.3A 2020-07-20 2020-07-20 Dispositif d'éclairage pour un phare de véhicule automobile Active EP3943807B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20186703.3A EP3943807B1 (fr) 2020-07-20 2020-07-20 Dispositif d'éclairage pour un phare de véhicule automobile
KR1020210088792A KR102588156B1 (ko) 2020-07-20 2021-07-07 자동차 헤드램프용 조명 장치
CN202110818699.2A CN113958920A (zh) 2020-07-20 2021-07-20 用于机动车大灯的照明设备

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20186703.3A EP3943807B1 (fr) 2020-07-20 2020-07-20 Dispositif d'éclairage pour un phare de véhicule automobile

Publications (2)

Publication Number Publication Date
EP3943807A1 EP3943807A1 (fr) 2022-01-26
EP3943807B1 true EP3943807B1 (fr) 2023-09-06

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KR (1) KR102588156B1 (fr)
CN (1) CN113958920A (fr)

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Publication number Priority date Publication date Assignee Title
WO2023146277A1 (fr) 2022-01-25 2023-08-03 주식회사 엘지에너지솔루션 Bloc-batterie et véhicule le comprenant

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EP2306077B1 (fr) * 2009-10-05 2014-11-05 Automotive Lighting Reutlingen GmbH Phare de véhicule automobile doté d'un support optique compensant les extensions de température
JP2017092011A (ja) * 2015-11-17 2017-05-25 スタンレー電気株式会社 導光体及び車両用灯具

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DE102016125215A1 (de) * 2016-12-21 2018-06-21 HELLA GmbH & Co. KGaA Beleuchtungsvorrichtung für Fahrzeuge
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Publication number Priority date Publication date Assignee Title
EP2306077B1 (fr) * 2009-10-05 2014-11-05 Automotive Lighting Reutlingen GmbH Phare de véhicule automobile doté d'un support optique compensant les extensions de température
JP2017092011A (ja) * 2015-11-17 2017-05-25 スタンレー電気株式会社 導光体及び車両用灯具

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Publication number Publication date
KR102588156B1 (ko) 2023-10-12
KR20220011080A (ko) 2022-01-27
EP3943807A1 (fr) 2022-01-26
CN113958920A (zh) 2022-01-21

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