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EP3943807B1 - Lighting device for a motor vehicle headlight - Google Patents

Lighting device for a motor vehicle headlight 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
Authority
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
Other languages
German (de)
French (fr)
Other versions
EP3943807A1 (en
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
Original Assignee
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/en
Priority to KR1020210088792A priority patent/KR102588156B1/en
Priority to CN202110818699.2A priority patent/CN113958920B/en
Publication of EP3943807A1 publication Critical patent/EP3943807A1/en
Application granted granted Critical
Publication of EP3943807B1 publication Critical patent/EP3943807B1/en
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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)

Description

Die Erfindung betrifft eine Beleuchtungsvorrichtung für einen Kraftfahrzeugscheinwerfer.The invention relates to a lighting device for a motor vehicle headlight.

Die Erfindung betrifft ferner einen Kraftfahrzeugscheinwerfer mit einer Beleuchtungsvorrichtung.The invention also relates to a motor vehicle headlight with a lighting device.

Im Stand der Technik sind Beleuchtungsvorrichtungen mit Optiken, welche Lichtleitkörper aufweisen, bekannt, wobei die Lichtleitkörper häufig aus relativ weichen Materialien, wie beispielsweise Silikon, gefertigt werden. Auf Grund der Nähe der Lichtleitkörper zu einem Leuchtmittel der Beleuchtungsvorrichtung kommt es zu einer Erwärmung der Lichtleitkörper. Eine Beleuchtungsvorrichtung mit LED Lichtquellen und Lichtleitkörpern aus einem Polymer ist beispielsweise in der US 2008/253144 A1 gezeigt.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.

Nachteiligerweise führt diese Erwärmung zu einer Wärmeausdehnung und damit zu einer Längenänderung der Lichtleitkörper, wobei sich dadurch die Lichteintrittsflächen der Lichtleitkörper in Richtung des Leuchtmittels verschieben. Dies ändert die Lichteinstrahlcharakteristik in den Lichtleitkörper, wodurch es zu einer unerwünschten Veränderung der mit der Beleuchtungsvorrichtung erzeugten Lichtverteilung kommt.Disadvantageously, 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. This changes the light irradiation characteristics into the light guide body, which results in an undesirable change in the light distribution generated with the lighting device.

Die Aufgabe der vorliegenden Erfindung besteht darin, die Nachteile des Standes der Technik zu lindern bzw. zu beseitigen. Die Erfindung setzt sich daher insbesondere zum Ziel, eine Beleuchtungsvorrichtung zu schaffen, bei welcher temperaturbedingte Änderungen in der Lichtverteilung minimiert werden.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.

Diese Aufgabe wird durch eine Beleuchtungsvorrichtung mit den Merkmalen von Anspruch 1 gelöst.This object is achieved by a lighting device having the features of claim 1.

Bevorzugte Ausführungen sind in den abhängigen Ansprüchen angegeben.Preferred embodiments are given in the dependent claims.

Erfindungsgemäß weist die Primäroptik Ausgleichselemente auf, welche zwischen mehreren, insbesondere allen, benachbarten Lichtleitkörpern angeordnet sind.According to the invention, the primary optics has compensating elements, which are arranged between several, in particular all, adjacent fiber-optic elements.

Damit ergibt sich der Vorteil, dass trotz einer wärmebedingten Längenänderung der Lichtleitkörper die Abstände der einzelnen Lichteintrittsflächen zu den jeweiligen Lichtquellen konstant gehalten werden. Damit bleiben die optischen Eigenschaften und damit die erzeugbare Lichtverteilung gleich. Jener Bereich des Halters, welcher sich zwischen den Öffnungen, durch welche die Lichtleitkörper geführt sind, befindet, kann als Anschlagspunkt oder Auflagepunkt für die Ausgleichselemente dienen. Die Ausgleichselemente ragen insbesondere nicht durch die Öffnungen des Halters. Dadurch ist eine wärmebedingte Ausdehnung der Ausgleichselemente in Richtung der Lichtquellen nicht möglich. Mit anderen Worten können sich die Ausgleichselemente nur in Lichtausbreitungsrichtung ausdehnen, wobei dabei die Lichtleitkörper ebenfalls in Lichtausbreitungsrichtung verschoben werden. Da die Längenänderung der Lichtleitkörper der Verschiebungslänge entspricht, kann der Abstand der Lichteintrittsfläche jedes Lichtleitkörpers zu der dem Lichtleitkörper zugeordneten Lichtquelle bei der ersten und zweiten Temperatur, sowie während dem Übergang von der ersten zur zweiten Temperatur, konstant gehalten werden. Die Lichtleitung innerhalb des Lichtleitkörpers erfolgt insbesondere durch Totalreflexion der Lichtstrahlen an der Innenseite der Lichtleitkörper. Die Lichtleitkörper können als transparente Hohlkörper oder Vollkörper ausgebildet sein. Der Lichtleitkörper kann als Lichtleiter ausgebildet sein. Die Ausgleichselemente können im Wesentlichen als längliche Körper ausgebildet sein und können eine erste und eine der ersten gegenüberliegende zweite Stirnfläche aufweisen, wobei sich ein länglicher Körper zwischen den beiden Stirnflächen erstrecken kann. Die erste Stirnfläche kann im Wesentlichen zwischen zwei Lichtaustrittsflächen von zwei benachbarten Lichtleitkörpern anliegen. Die zweite Stirnfläche kann an dem Halter zwischen zwei Öffnungen anliegen.This results in the advantage that the distances between the individual light entry surfaces and the respective light sources are kept constant despite a change in length of the light-guiding bodies caused by heat. The optical properties and thus the light distribution that can be generated remain the same. That area of the holder which is located between the openings through which the light guide bodies are routed can serve as a stop point or support point for the compensating elements. In particular, the compensating elements do not protrude through the openings of the holder. As a result, thermal expansion of the compensating elements in the direction of the light sources is not possible. In other words, the compensating elements can only expand in the direction of light propagation, with the light-guiding bodies also being displaced in the direction of light propagation. Since the change in length of the fiber optics corresponds to the displacement length, 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.

Es kann vorgesehen sein, dass die Ausgleichselemente aus einem ersten Material und die Lichtleitkörper aus einem zweiten Material gebildet sind.Provision can be made for the compensating elements to be formed from a first material and for the light-guiding bodies to be formed from a second material.

Es kann vorgesehen sein, dass das erste und das zweite Material gleich sind. Dadurch ergibt sich der Vorteil, dass die Lichtleitkörper und die Ausgleichselemente dieselben thermischen Eigenschaften aufweisen.It can be provided that 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.

Es kann vorgesehen sein, dass das erste Material und das zweite Material den gleichen Wärmeausdehnungskoeffizienten aufweisen. Das erste und das zweite Material können auch einen unterschiedlichen Wärmeausdehnungskoeffizienten aufweisen.It can be provided that the 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.

Es kann vorgesehen sein, dass die Ausgleichselemente und die Lichtleitkörper aus synthetischen Polymeren, beispielsweise aus einem Silikon, hergestellt sind. Dadurch kann eine kostengünstige Herstellung ermöglich werden.Provision can be made for the compensating elements and the light-conducting bodies to be made from synthetic polymers, for example from a silicone. This can enable cost-effective production.

Es kann vorgesehen sein, dass die Ausgleichselemente im Querschnitt zylinderförmig oder quaderförmig ausgebildet sind.Provision can be made for the compensating elements to have a cylindrical or cuboid cross section.

Es kann vorgesehen sein, dass die Ausgleichselemente und die Lichtleitkörper im Wesentlichen die gleiche Länge aufweisen. Vorzugsweise weisen die Ausgleichselemente eine Länge auf, welche um den Anteil der Lichtleitkörper, welcher durch die Öffnung ragt, kürzer ist.Provision can be made for the compensating elements and the light-guiding bodies to 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.

Es kann vorgesehen sein, dass an einer Seite des Halters, welche den Lichtquellen zugewandt ist, ein Hitzeschild angeordnet ist. Der Hitzeschild kann zwischen den Öffnungen angeordnet sein. Damit ergibt sich der Vorteil, dass der Halter und damit auch die Primäroptik besser gegen die Wärme der Lichtquellen geschützt sind.Provision can be made for a heat shield to be arranged on a side of the holder which faces the light sources. 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.

Es kann vorgesehen sein, dass der Hitzeschild eine Anzahl an Durchgangsöffnungen aufweist, wobei die Anzahl der Durchgangsöffnungen in dem Hitzeschild der Anzahl der Öffnungen in dem Halter entspricht.Provision can be made for the heat shield to have a number of through-openings, with the number of through-openings in the heat shield corresponding to the number of openings in the holder.

Es kann vorgesehen sein, dass die Durchgangsöffnungen und die Öffnungen deckungsgleich sind. Insbesondere weisen die Durchgangsöffnungen und/oder die Öffnungen einen Querschnitt auf, welcher im Wesentlichen dem Querschnitt der Lichtleitkörper entspricht.It can be provided that the through openings and the openings are congruent. In particular, the through-openings and/or the openings have a cross-section which essentially corresponds to the cross-section of the light-guiding body.

Es kann vorgesehen sein, dass der Hitzeschild an dem Halter dergestalt angeordnet ist, dass jede Durchgangsöffnung jeweils einer Öffnung dergestalt zugeordnet ist, dass jeweils ein Lichtleitkörper durch eine Durchgangsöffnung und durch die der Durchgangsöffnung zugeordneten Öffnung ragt.Provision can be made for the heat shield to be arranged on the holder in such a way that 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.

Es kann vorgesehen sein, dass höchstens 5% bis 15%, vorzugsweise 10%, der Gesamtlänge des Lichtleitkörpers durch die Öffnung ragt.Provision can be made for at most 5% to 15%, preferably 10%, of the total length of the light-conducting body to protrude through the opening.

Es kann vorgesehen sein, dass der Halter und die Ausgleichselemente einstückig ausgebildet sind. Die Ausgleichselemente können beim Herstellungsprozess des Halters mit dem Halter integral bzw. einteilig hergestellt werden. Vorzugsweise sind der Halter und die Ausgleichselemente formschlüssig miteinander verbunden.Provision can be made for the holder and the compensating elements to 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.

Es kann vorgesehen sein, dass die Primäroptik und die Ausgleichselemente einstückig ausgebildet sind. Die Ausgleichselemente können beispielsweise zusammen mit der Primäroptik in demselben Spritzgussverfahren integral bzw. einteilig hergestellt werden.Provision can be made for the primary optics and the compensating elements to be designed in one piece. The compensating elements can, for example, be produced integrally or in one piece together with the primary optics in the same injection molding process.

Erfindungsgemäß ist ein Kraftfahrzeugscheinwerfer mit einer vorstehen beschriebenen Beleuchtungsvorrichtung vorgesehen.According to the invention, a motor vehicle headlight is provided with a lighting device as described above.

Im Rahmen dieser Beschreibung sind die Begriffe "oben", "unten", "horizontal", "vertikal" als Angaben der Ausrichtung zu verstehen, wenn die Beleuchtungsvorrichtung in normaler Benutzungsstellung angeordnet ist.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.

Die Erfindung wird nachstehend anhand eines bevorzugten Ausführungsbeispiels, auf das sie jedoch nicht beschränkt sein soll, noch weiter erläutert. In den Zeichnungen zeigt:

  • Fig. 1 einen Ausschnitt eines vertikalen Schnitts durch eine erfindungsgemäße Beleuchtungsvorrichtung; und
  • Fig. 2 eine Primäroptik der Beleuchtungsvorrichtung.
The invention is explained in more detail below using a preferred exemplary embodiment, to which, however, it should not be restricted. In the drawings shows:
  • 1 a section of a vertical section through a lighting device according to the invention; and
  • 2 a primary optics of the lighting device.

Fig. 1 zeigt einen Ausschnitt eines vertikalen Schnitts einer erfindungsgemäßen Beleuchtungsvorrichtung 1 für einen Kraftfahrzeugscheinwerfer (zur besseren Darstellung wird nur ein Teil der gesamten Vorrichtung gezeigt, jener Teil, welcher die Lichtleitkörper 4 und die Ausgleichselemente 7 im Detail zeigt). Die Beleuchtungsvorrichtung 1 umfasst ein (nicht gezeigtes) Leuchtmittel, zum Erzeugen und Abstrahlen von Licht, wobei das Leuchtmittel eine Vielzahl von Lichtquellen aufweist. Die Beleuchtungsvorrichtung 1 umfasst ferner eine Primäroptik 2 mit einem Grundkörper 3 und mit mehreren von dem Grundkörper 3 vorragenden Lichtleitkörpern 4 zum Formen einer gewünschten Lichtverteilung aus dem Licht des Leuchtmittels. Die Lichtleitkörper 4 weisen jeweils eine Lichteintrittsfläche 4a und eine Lichtaustrittsfläche 4b auf, wobei jeder Lichteintrittsfläche 4a eine Lichtquelle des Leuchtmittels zugeordnet ist, sodass das Licht einer Lichtquelle in die der Lichtquelle zugeordneten Lichteintrittsfläche 4a eingespeist werden kann. Die Lichteintrittsflächen 4a sind vorzugsweise in einem gleichmäßigen Raster, insbesondere in Zeilen und Spalten, und in derselben Ebene liegend angeordnet. 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.

Die Beleuchtungsvorrichtung 1 umfasst einen Halter 5, an welchem der Grundkörper 3 der Primäroptik 2 angeordnet ist, wobei der Halter 5 eine der Anzahl der Lichtleitkörper 4 entsprechende Anzahl an und zu den Lichtleitkörpern 4 korrespondierende Öffnungen 6 aufweist. Es ist jeweils ein Lichtleitkörper 4 einer Öffnung 6 zugeordnet, wobei die Öffnungen 6 dazu eingerichtet sind, die Lichtleitkörper 4 der Primäroptik 2 aufzunehmen und in Position zu halten. Jeweils ein Lichtleitkörper 4 ragt dergestalt durch eine dem entsprechenden Lichtleitkörper 4 zugeordnete Öffnung 6, dass die Lichteintrittsflächen 4a jeweils einen Abstand zu den Lichtquellen aufweisen. Insbesondere ragen höchstens 5% bis 15%, vorzugsweise 10%, der Gesamtlänge eines Lichtleitkörpers 4 durch die dem Lichtleitkörper 4 zugeordnete Öffnung.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 . In each case 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. In particular, 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 .

Die Lichtleitkörper 4 sind dergestalt ausgebildet, insbesondere aus einem derartigen Material gebildet, dass die Lichteintrittsflächen 4a der Lichtleitkörper 4 bei einer ersten Temperatur der Primäroptik 2 einen ersten Abstand und bei einer zweiten Temperatur der Primäroptik 2 einen zweiten Abstand zu den Lichtquellen aufweisen. Die erste Temperatur der Primäroptik 2 liegt in einem ausgeschalteten Zustand der Lichtquellen und die zweite Temperatur in einem eingeschalteten Zustand der Lichtquellen vor. Der erste Abstand ist größer als der zweite Abstand und die erste Temperatur ist niedriger als die zweite Temperatur. Die Differenz zwischen dem ersten Abstand bei der ersten Temperatur und dem zweiten Abstand bei der zweiten Temperatur definiert eine Verschiebungslänge der Position der Lichteintrittsflächen 4a relativ zu der der jeweiligen Lichteintrittsfläche 4a zugeordneten Lichtquelle.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.

Wie in Fig. 1 und 2 ersichtlich, weist die Primäroptik 2 Ausgleichselemente 7 auf, welche zwischen mehreren, insbesondere allen, benachbarten Lichtleitkörpern 4 angeordnet sind. In dem gezeigten Ausführungsbeispiel sind die Ausgleichselemente 7 entlang eines Randbereichs der Primäroptik 2 angeordnet. Die Ausgleichselemente 7 erstrecken sich im Wesentlichen von den Lichtaustrittsflächen 4b der Lichtleitkörper 4 hin zu dem Bereich des Halters 5, an welchem sich die Öffnungen 6 befinden, und liegen zwischen den Öffnungen 6 an dem Halter 5 an. Die Ausgleichselemente 7 weisen bei der ersten Temperatur eine erste Länge und bei der zweiten Temperatur eine zweite Länge auf, wobei die erste Länge kleiner ist als die zweite Länge. Die Ausgleichelemente 7 sind dergestalt ausgebildet, dass sie die Primäroptik 2 samt den Lichtleitkörpern 4 durch eine temperaturbedingte Längenänderung der Ausgleichselemente 7 in Lichtausbreitungsrichtung verschieben. Die Differenz zwischen der ersten Länge bei der ersten Temperatur und der zweiten Länge bei der zweiten Temperatur ist gleich der Verschiebungslänge.As in 1 and 2 As can be seen, the primary optics 2 has compensating elements 7 which are arranged between several, in particular all, adjacent fiber-optic elements 4 . In the exemplary embodiment shown, 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.

Die Ausgleichselemente 7 sind aus einem ersten Material und die Lichtleitkörper 4 aus einem zweiten Material gebildet, wobei in dem gezeigten Ausführungsbeispiel das erste und das zweite Material gleich sind und einen gleichen Wärmeausdehnungskoeffizienten aufweisen. Die Ausgleichselemente 7 und die Lichtleitkörper 4 sind beispielsweise aus einem Silikon hergestellt.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.

Wie in Fig. 2 ersichtlich, sind die Ausgleichselemente 7 im Querschnitt zylinderförmig. Die Lichtleitkörper 4 sind im Querschnitt quaderförmig ausgebildet und sind von der Lichtaustrittsfläche 4b hin zur Lichteintrittsfläche 4a verjüngt.As in 2 As can be seen, 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.

An einer Seite des Halters 5, welche den Lichtquellen zugewandt ist, ist ein Hitzeschild 8 angeordnet. Der Hitzeschild 8 hat eine Anzahl an Durchgangsöffnungen, wobei die Anzahl der Durchgangsöffnungen in dem Hitzeschild 8 der Anzahl der Öffnungen 6 in dem Halter 5 entspricht. Die Durchgangsöffnungen und die Öffnungen 6 sind deckungsgleich. Der Hitzeschild 8 ist an dem Halter 5 dergestalt angeordnet, dass jede Durchgangsöffnung jeweils einer Öffnung 6 dergestalt zugeordnet ist, dass jeweils ein Lichtleitkörper 4 durch eine Durchgangsöffnung und die der Durchgangsöffnung zugeordneten Öffnung 6 ragt.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.

Claims (15)

  1. Lighting device (1) for a motor vehicle headlight, the lighting device (1) comprising:
    - a lighting means, for generating and emitting light, the lighting means having a plurality of light sources,
    - a primary optics (2) having a base body (3) and having a plurality of light guide bodies (4) projecting from the base body (3) for forming a desired light distribution from the light of the illuminant, the light guide bodies (4) each having a light entrance surface (4a) and a light exit surface (4b) each light entry surface (4a) being assigned a light source of the illuminant in such a way that the light of a light source can be fed into the light entry surface (4a) assigned to the light source, the light entry surfaces (4a) preferably being arranged in a uniform grid, in particular in rows and columns, and lying in the same plane
    - 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), in each case one light guide body (4) being assigned to one opening (6), the openings (6) being set up to receive the light guide bodies (4) of the primary optics (2) and to hold them in position, in each case one light guide body (4) projecting through an opening (6) assigned to the corresponding light guide body (4) in such a way that the light entry surfaces (4a) are each at a distance from the light sources
    the light guide bodies (4) being designed in such a way, in particular being formed from a material of such a kind, that the light entry surfaces (4a) of the light guide bodies (4) are at a first distance from the light sources at a first temperature of the primary optics (2) and are at a second distance from the light sources at a second temperature of the primary optics (2),
    wherein the first temperature of the primary optics (2) is in an off state of the light sources and the second temperature is in an on state of the light sources,
    wherein the first temperature is lower than the second temperature,
    characterized in that
    the primary optics (2) has compensating elements (7) which are arranged between a plurality of, in particular all, adjacent light guide bodies (4) and extend from the light exit surfaces (4b) of the light guide bodies (4) to the region of the holder (5) on which the openings (6) are located and bear against the holder (5) between the openings (6) and contact the latter, the compensating elements (7) having 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) being designed in such a way that, in the event of a temperature change from the first temperature (T1) to the second temperature (T2), the primary optics (2) together with the light guide bodies (4) are displaced in the light propagation direction by this temperature-related change in length of the compensating elements (7),
    wherein without this temperature-related change in length of the compensating elements (7) the first distance would be greater than the second distance and hereby the difference between the first distance and the second distance defines a displacement length of the position of the light entry surface (4a) relative to the light source associated with the respective light entry surface (4),
    wherein the difference between the first length at the first temperature and the second length at the second temperature is equal to the displacement length.
  2. Lighting device (1) according to claim 1, wherein the compensating elements (7) are formed of a first material and the light guiding bodies (4) are formed of a second material.
  3. Lighting device (1) according to claim 2, wherein said first and second materials are the same.
  4. Lighting device (1) according to claim 2 or 3, wherein the first material and the second material have the same coefficient of thermal expansion.
  5. Lighting device (1) according to any one of the preceding claims, wherein the compensating elements (7) and the light guiding bodies (4) are made of synthetic polymers, for example of a silicone.
  6. Lighting device (1) according to any one of the preceding claims, wherein the compensating elements (7) are cylindrical or cuboidal in cross-section.
  7. Lighting device (1) according to any one of the preceding claims, wherein the compensating elements (7) and the light guide bodies (4) have substantially the same length.
  8. Lighting device (1) according to one of the preceding claims, wherein a heat shield (8) is arranged on a side of the holder (5) facing the light sources.
  9. Lighting device (1) according to claim 8, wherein the heat shield (8) has a number of through openings, wherein the number of through openings in the heat shield (8) corresponds to the number of openings (6) in the holder (5).
  10. Lighting device (1) according to claim 9, wherein the through openings and the openings (6) are congruent.
  11. Lighting device (1) according to claim 9 or 10, wherein the heat shield (8) is arranged on the holder (5) in such a way that each through-opening is assigned to a respective opening (6) in such a way that a respective light guide body (4) projects through a through-opening and through the opening (6) assigned to the through-opening.
  12. Lighting device (1) according to one of the preceding claims, wherein at most 5% to 15%, preferably 10%, of the total length of the light guide body (4) projects through the opening (6).
  13. Lighting device (1) according to one of the preceding claims, wherein the holder (5) and the compensating elements (7) are formed in one piece.
  14. Lighting device (1) according to any one of the preceding claims, wherein the primary optics (2) and the compensating elements (7) are formed in one piece.
  15. Motor vehicle headlamp, comprising a lighting device (1) according to any one of claims 1 to 14.
EP20186703.3A 2020-07-20 2020-07-20 Lighting device for a motor vehicle headlight Active EP3943807B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP20186703.3A EP3943807B1 (en) 2020-07-20 2020-07-20 Lighting device for a motor vehicle headlight
KR1020210088792A KR102588156B1 (en) 2020-07-20 2021-07-07 Lighting device for a motor vehicle headlamp
CN202110818699.2A CN113958920B (en) 2020-07-20 2021-07-20 Lighting device for motor vehicle headlight

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20186703.3A EP3943807B1 (en) 2020-07-20 2020-07-20 Lighting device for a motor vehicle headlight

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JP2024527297A (en) 2022-01-25 2024-07-24 エルジー エナジー ソリューション リミテッド Battery pack and automobile including same

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JP2017092011A (en) * 2015-11-17 2017-05-25 スタンレー電気株式会社 Light guide body and vehicular lighting tool

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JP2017092011A (en) * 2015-11-17 2017-05-25 スタンレー電気株式会社 Light guide body and vehicular lighting tool

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CN113958920B (en) 2024-07-23
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