EP3176494B1 - Light module comprising two light guides - Google Patents

Light module comprising two light guides Download PDF

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Publication number
EP3176494B1
EP3176494B1 EP16200635.7A EP16200635A EP3176494B1 EP 3176494 B1 EP3176494 B1 EP 3176494B1 EP 16200635 A EP16200635 A EP 16200635A EP 3176494 B1 EP3176494 B1 EP 3176494B1
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EP
European Patent Office
Prior art keywords
light
light guide
per
module
guide
Prior art date
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Application number
EP16200635.7A
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German (de)
French (fr)
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EP3176494A1 (en
Inventor
Thomas Kleiner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Marelli Automotive Lighting Reutlingen Germany GmbH
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Automotive Lighting Reutlingen GmbH
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Publication of EP3176494A1 publication Critical patent/EP3176494A1/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
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/50—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
    • F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
    • F21S43/14—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/237—Light guides characterised by the shape of the light guide rod-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/236—Light guides characterised by the shape of the light guide
    • F21S43/239—Light guides characterised by the shape of the light guide plate-shaped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/243—Light guides characterised by the emission area emitting light from one or more of its extremities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/242—Light guides characterised by the emission area
    • F21S43/245—Light guides characterised by the emission area emitting light from one or more of its major surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/247—Light guides with a single light source being coupled into the light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/249—Light guides with two or more light sources being coupled into the light guide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
    • F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
    • F21S43/235—Light guides
    • F21S43/251—Light guides the light guides being used to transmit light from remote light sources

Definitions

  • the present invention relates to a lamp module for a motor vehicle lighting device according to the preamble of claim 1.
  • a light module is from EP 2 527 722 A2 known and has, among other things, an elongate first light guide, which has a light exit surface extending along the elongate first light guide, and has a second light guide, which has a first narrow side that is opposite the light exit surface of the first light guide along its length and serves as a light entry surface, and a first narrow side as a Light exit surface serving second narrow side, which are separated from the first narrow side by lying between the narrow sides broad sides of the light guide.
  • the lamp module has at least one transparent lens which extends from the second narrow side of the second light guide in the direction of the first narrow side and which extends along the longitudinal extension of the narrow sides of the second light guide.
  • the second light guide is also referred to below as thick-wall optics.
  • Such a lamp module is used to generate a signal light distribution such as a daytime running light distribution.
  • the second light guide mainly has the function of a design element.
  • the broad sides lying between the narrow sides of the thick-wall optics serve as transport surfaces on which the light propagating from the light entry surface of the thick-wall optics to its light exit surface undergoes total internal reflections.
  • At least one of the broad sides is often visible from the outside. This applies in particular to headlights that also accommodate other light modules and therefore have a large light exit opening that is often covered by a smooth cover plate.
  • their appearance often has a higher priority than optimizing these areas in terms of lighting technology. If, for example, the broad sides are to be frosted for design reasons, this is at the expense of efficiency and, under certain circumstances, also at the expense of the homogeneity of the appearance of the light exit surface, because the conditions prevailing inside the second light guide on the frosted surface are different for internal worsen total internal reflections.
  • Luminaire modules with elongated light guides are also from the DE 10 2006 032 373 A1 , the U.S. 5,668,913 and the JP 2014-235819 famous.
  • the object of the invention is to specify a lighting device of the type mentioned at the outset, in which the greatest possible freedom of design is possible not at the expense of the efficiency and the homogeneity of the appearance of the light exit surface of the thick-wall optics.
  • the lighting device according to the invention differs from the prior art in that the second light guide has a cross section that increases monotonically from its light entry surface to its light exit surface.
  • the transparent lens covers the broad sides and is therefore more visible to the viewer than the broad side of the thick-wall optics 14 behind the transparent lens.
  • the transparent lens can have a frosting for design reasons, for example.
  • the broad side, which is behind the transparent cover panel for the observer, can be optimized in terms of lighting without regard to design requirements. In particular, it can be as smooth as a mirror in order to enable total internal reflections that are as lossless as possible. Since both the lens and the thick-wall optics are transparent, the appearance of the lighting module according to the invention is similar to the appearance of a thick-wall optics without a lens.
  • a preferred embodiment is characterized in that the lens has a side surface facing away from the broad side of the second light guide, which is clear, frosted or provided with surface structures.
  • the second light guide has a monotonically increasing cross-section from its light entry surface to its light exit surface, there is also a Free-form surface or a parabolic shape conceivable.
  • the broad sides of the second light guide are as smooth as glass.
  • a further preferred embodiment is characterized in that the light exit surface of the second light guide is smooth or stepped or provided with scattering, pillow-shaped optics.
  • the light entry surface of the second light guide is smooth or stepped or provided with scattering, pillow-shaped optics.
  • an elongated rear side of the light guide opposite the light exit surface of the light guide has light-deflecting structures that are prism-shaped.
  • Another preferred embodiment is characterized in that the elongated first light guide is fed with light from both of its end faces.
  • the light coupled in via one end face has the same color as the light coupled in via the other end face. This improves the uniformity of the brightness of the light exit surface.
  • the light coupled in via one end face has a different color than the light coupled in via the other end face, so that two light functions can be fulfilled with one light guide.
  • An alternative configuration to this is characterized in that the lighting module has a second transparent lens arranged below the thick-wall optics.
  • the two light discs merge into one another at one end or at both lateral ends of the second light guide, which serve neither as a light entry surface nor as a light exit surface, so that the second light guide, with the exception of its light entry surface and its light exit surface, has a light disc that is curved in space is enveloped.
  • the figure 1 a lamp module 10 for a motor vehicle lighting device, which has an elongated first light guide 12, a second light guide 14 and two lenses 16 and 18.
  • the figure 2 shows the subject of figure 1 in a lateral cross section.
  • the x-direction 10 indicates a main emission direction of the lighting module.
  • the x-direction is parallel to a longitudinal axis of the vehicle, for example.
  • the y-direction is parallel to a lateral axis of the vehicle and the z-direction is parallel to a vertical axis of the vehicle and points upwards.
  • this is only an example and is not intended to limit the invention.
  • the first light guide 12 has a light exit surface 20 extending along the elongated first light guide 12 .
  • the second light guide 14 has a first narrow side 22 that is opposite the light exit surface 20 of the first light guide 12 along its length and serves as a light entry surface, and a second narrow side 24 that serves as a light exit surface.
  • the second narrow side 24 is separated from the first narrow side 22 by broad sides 26, 28 of the second lying between the narrow sides 22, 24 Light guide 14 separately.
  • the transparent lens 16 extends from the second narrow side 24 of the second light guide 14 in the direction of the first narrow side 22 of the second light guide 14. This direction is essentially opposite to the main emission direction.
  • the transparent lens 16 extends transversely thereto along the longitudinal extent of the narrow sides 22, 24 of the second light guide. In this example, the longitudinal extent runs essentially parallel to the y-direction.
  • the lens 16 has a side surface 16.1 facing away from the broad side 26 of the second light guide 14. Depending on the design specification, this side surface 16.1 is clear, frosted or provided with surface structures which are intended to appeal to the viewer visually but do not have any lighting effect.
  • the lens 16 can be used as a surface that can be designed for the appearance, while the broad side 26 can be used to optimize the optical function of the thick-wall optics. This applies analogously to the broad side 28 and the lens 18.
  • the thick-wall optics ie the second light guide 14 has according to the invention, as in particular figure 2 as can be seen, has a cross section which increases monotonously from its light entry surface 22 to its light exit surface 24 .
  • a parabolic cross section or a free-form surface is also possible.
  • the cross section of the second light guide which increases in the direction of propagation of the light in the second light guide, results in a parallelization of the light as a result of internal total reflections. This contributes to a desired homogeneity of the interior of the second Light guide 14 from occurring illumination of its light exit surface 24 at.
  • this shape increases the opening angle of the light that experiences total internal reflections within the second light guide. This increases the efficiency of the light guide, i.e. the ratio of light that is specifically coupled out to the light that is coupled in.
  • the lateral surfaces, ie the broad sides 26, 28 of the second light guide 14 are preferably mirror-smooth, which enables total internal reflections that are practically lossless. This photometric effect of the practically lossless total internal reflection contributes to the desired high efficiency.
  • the light exit surface 24 of the thick-wall optics 14 is smooth or stepped or provided with scattering, pillow-shaped optics, depending on the lighting and design requirements. This applies analogously to the light entry surface 22 of the thick-wall optics 14, which can accordingly also be smooth or stepped or provided with scattering, pillow-shaped optics. Steps are preferably provided from a sweep angle of 30°. A sweep is understood to mean that the light exit surface (in the case of a stepped light guide, an envelope) of the light exit surface encloses an angle with the transverse axis of the vehicle. f
  • first light guide 12 In the first light guide 12, light fed from a light source (not shown in the figure) into an end face 12.1 of the first light guide 12 propagates essentially along the first light guide 12. The light experiences internal light on a smooth light exit surface 20 and on smooth side walls 12.2 of the first light guide 12 total reflections.
  • These structures deflect light impinging on them so steeply to the light exit surface 20 of the elongated first light guide 12 that the deflected light emerges distributed over the elongated light exit surface 20 of the first light guide 12 and via the light exit surface 20 of the first light guide 12 opposite the light entry surface 22 of the second light guide 14 enters the second light guide 14 .
  • two colors of light are coupled into the light guide 12 via a single end face of the elongated first light guide 12 .
  • the elongated first light guide 12 can be supplied with light from one of its two end faces 12.1, 12.4.
  • the light coupled in via one end face can have the same color as the light coupled in via the other end face.
  • the light coupled in via one end face can have a different color than the light coupled in via the other end face.
  • a flashing light function using yellow or yellow-red light can be implemented with the same arrangement of first light guide, thick-wall optics and lens as a daytime running light function or position light function using white light.
  • the lamp module 10 has a second transparent lens 18 arranged below the thick-wall optics 24 .
  • the two lenses 16, 18 can also be at one end or at both lateral ends of the thick-wall optics 14, ie on both sides of the Thick-wall optics 14, which in the illustrated embodiment serve neither as a light entry surface 22 nor as a light exit surface 24, merge into one another, so that the thick-wall optics 14, with the exception of its light entry surface 22 and its light exit surface 24, is enveloped by a lens that is curved in space.

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

Description

Die vorliegende Erfindung betrifft ein Leuchtenmodul für eine Kraftfahrzeugbeleuchtungseinrichtung nach dem Oberbegriff des Anspruchs 1. Ein solches Lichtmodul ist aus der EP 2 527 722 A2 bekannt und weist unter anderem einen langgestreckten ersten Lichtleiter auf, der eine sich längs des langgestreckten ersten Lichtleiters erstreckende Lichtaustrittsfläche aufweist, und weist einen zweiten Lichtleiter auf, der eine der Lichtaustrittsfläche des ersten Lichtleiters entlang ihrer Längserstreckung gegenüberliegende und als Lichteintrittsfläche dienende erste Schmalseite und eine als Lichtaustrittsfläche dienende zweite Schmalseite, die von der ersten Schmalseite durch zwischen den Schmalseiten liegende Breitseiten des Lichtleiters getrennt sind. Das Leuchtenmodul weist wenigstens eine transparente Lichtscheibe auf, die sich von der zweiten Schmalseite des zweiten Lichtleiters aus in Richtung zur ersten Schmalseite erstreckt und die sich längs der Längserstreckung der Schmalseiten des zweiten Lichtleiters erstreckt.The present invention relates to a lamp module for a motor vehicle lighting device according to the preamble of claim 1. Such a light module is from EP 2 527 722 A2 known and has, among other things, an elongate first light guide, which has a light exit surface extending along the elongate first light guide, and has a second light guide, which has a first narrow side that is opposite the light exit surface of the first light guide along its length and serves as a light entry surface, and a first narrow side as a Light exit surface serving second narrow side, which are separated from the first narrow side by lying between the narrow sides broad sides of the light guide. The lamp module has at least one transparent lens which extends from the second narrow side of the second light guide in the direction of the first narrow side and which extends along the longitudinal extension of the narrow sides of the second light guide.

Der zweite Lichtleiter wird im Folgenden auch als Dickwandoptik bezeichnet. Ein solches Leuchtenmodul dient zur Erzeugung einer Signallichtverteilung wie zum Beispiel einer Tagfahrlichtverteilung. Der zweite Lichtleiter hat dabei in einer Ausgestaltung hauptsächlich die Funktion eines Designelements.The second light guide is also referred to below as thick-wall optics. Such a lamp module is used to generate a signal light distribution such as a daytime running light distribution. In one embodiment, the second light guide mainly has the function of a design element.

Die zwischen den Schmalseiten der Dickwandoptik liegenden Breitseiten dienen einerseits als Transportflächen, an denen das von der Lichteintrittsfläche der Dickwandoptik zu deren Lichtaustrittsfläche propagierende Licht interne Totalreflexionen erfährt.The broad sides lying between the narrow sides of the thick-wall optics serve as transport surfaces on which the light propagating from the light entry surface of the thick-wall optics to its light exit surface undergoes total internal reflections.

Zumindest eine der Breitseiten ist dabei häufig von außen sichtbar. Dies gilt insbesondere für Scheinwerfer, die auch weitere Lichtmodule beherbergen und die deshalb eine große Lichtaustrittsöffnung aufweisen, die häufig von einer glatten Abdeckscheibe abgedeckt wird. Bei der Gestaltung der Breitseiten hat häufig deren Erscheinungsbild eine höhere Priorität als eine Optimierung dieser Flächen in lichttechnischer Hinsicht. Ist zum Beispiel eine Mattierung der Breitseiten aus gestalterischen Gründen vorgesehen, so geht dies zu Lasten der Effizienz und, unter Umständen, auch zu Lasten der Homogenität des Erscheinungsbildes der Lichtaustrittsfläche, weil sich die im Inneren des zweiten Lichtleiters an der mattierten Fläche herrschenden Bedingungen für interne Totalreflexionen verschlechtern. Leuchtenmodule mit langgestreckten Lichtleitern sind auch aus der DE 10 2006 032 373 A1 , der US 5,668,913 und der JP 2014-235819 bekannt.At least one of the broad sides is often visible from the outside. This applies in particular to headlights that also accommodate other light modules and therefore have a large light exit opening that is often covered by a smooth cover plate. When designing the broad sides, their appearance often has a higher priority than optimizing these areas in terms of lighting technology. If, for example, the broad sides are to be frosted for design reasons, this is at the expense of efficiency and, under certain circumstances, also at the expense of the homogeneity of the appearance of the light exit surface, because the conditions prevailing inside the second light guide on the frosted surface are different for internal worsen total internal reflections. Luminaire modules with elongated light guides are also from the DE 10 2006 032 373 A1 , the U.S. 5,668,913 and the JP 2014-235819 famous.

Vor diesem Hintergrund besteht die Aufgabe der Erfindung in der Angabe einer Beleuchtungseinrichtung der eingangs genannten Art, bei der eine möglichst freie Gestaltbarkeit nicht zu Lasten der Effizienz und der Homogenität des Erscheinungsbildes der Lichtaustrittsfläche der Dickwandoptik geht.Against this background, the object of the invention is to specify a lighting device of the type mentioned at the outset, in which the greatest possible freedom of design is possible not at the expense of the efficiency and the homogeneity of the appearance of the light exit surface of the thick-wall optics.

Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst. Die erfindungsgemäße Beleuchtungseinrichtung unterscheidet sich von dem Stand der Technik dadurch, dass der zweite Lichtleiter einen von seiner Lichteintrittsfläche zu seiner Lichtaustrittsfläche monoton zunehmenden Querschnitt aufweist.This object is achieved with the features of claim 1. The lighting device according to the invention differs from the prior art in that the second light guide has a cross section that increases monotonically from its light entry surface to its light exit surface.

Die transparente Lichtscheibe deckt die Breitseiten ab und ist daher für den Betrachter eher sichtbar als die für den Betrachter hinter der transparenten Lichtscheibe liegende Breitseite der Dickwandoptik 14. Die transparente Lichtscheibe kann zum Beispiel aus gestalterischen Gründen eine Mattierung aufweisen. Die für den Betrachter hinter der transparenten Abdeckscheibe liegende Breitseite kann dabei ohne Rücksicht auf gestalterische Anforderungen in lichttechnischer Hinsicht optimiert werden. Sie kann insbesondere spiegelglatt sein, um möglichst verlustlose interne Totalreflexionen zu ermöglichen. Da sowohl die Lichtscheibe als auch die Dickwandoptik transparent sind, ähnelt das Erscheinungsbild des erfindungsgemäßen Leuchtenmoduls dem Erscheinungsbild einer Dickwandoptik ohne Lichtscheibe.The transparent lens covers the broad sides and is therefore more visible to the viewer than the broad side of the thick-wall optics 14 behind the transparent lens. The transparent lens can have a frosting for design reasons, for example. The broad side, which is behind the transparent cover panel for the observer, can be optimized in terms of lighting without regard to design requirements. In particular, it can be as smooth as a mirror in order to enable total internal reflections that are as lossless as possible. Since both the lens and the thick-wall optics are transparent, the appearance of the lighting module according to the invention is similar to the appearance of a thick-wall optics without a lens.

Eine bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass die Lichtscheibe eine der Breitseite des zweiten Lichtleiters abgewandte Seitenfläche aufweist, die klar, mattiert oder mit Oberflächenstrukturen versehen ist.A preferred embodiment is characterized in that the lens has a side surface facing away from the broad side of the second light guide, which is clear, frosted or provided with surface structures.

Ergänzend dazu, dass der zweite Lichtleiter einen von seiner Lichteintrittsfläche zu seiner Lichtaustrittsfläche monoton zunehmenden Querschnitt aufweist, ist auch eine Freiformfläche oder eine Parabelform denkbar.In addition to the fact that the second light guide has a monotonically increasing cross-section from its light entry surface to its light exit surface, there is also a Free-form surface or a parabolic shape conceivable.

Ferner ist bevorzugt, dass die Breitseiten des zweiten Lichtleiters spiegelglatt sind.Furthermore, it is preferred that the broad sides of the second light guide are as smooth as glass.

Eine weitere bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass die Lichtaustrittsfläche des zweiten Lichtleiters glatt oder gestuft oder mit streuenden, kissenförmigen Optiken versehen ist.A further preferred embodiment is characterized in that the light exit surface of the second light guide is smooth or stepped or provided with scattering, pillow-shaped optics.

Bevorzugt ist auch, dass die Lichteintrittsfläche des zweiten Lichtleiters glatt oder gestuft oder mit streuenden, kissenförmigen Optiken versehen ist.It is also preferred that the light entry surface of the second light guide is smooth or stepped or provided with scattering, pillow-shaped optics.

Bevorzugt ist auch, dass eine der Lichtaustrittsfläche des Lichtleiters gegenüberliegende langgestreckte Rückseite des Lichtleiters lichtumlenkende Strukturen aufweist, die prismenförmig sind.It is also preferred that an elongated rear side of the light guide opposite the light exit surface of the light guide has light-deflecting structures that are prism-shaped.

Eine weitere bevorzugte Ausgestaltung zeichnet sich dadurch aus, dass der langgestreckte erste Lichtleiter von seinen beiden Stirnseiten her mit Licht gespeist wird.Another preferred embodiment is characterized in that the elongated first light guide is fed with light from both of its end faces.

Bevorzugt ist auch, dass das über die eine Stirnseite eingekoppelte Licht die gleiche Farbe besitzt wie das über die andere Stirnseite eingekoppelte Licht. Dies verbessert eine Gleichmäßigkeit der Helligkeit der Lichtaustrittsfläche.It is also preferred that the light coupled in via one end face has the same color as the light coupled in via the other end face. This improves the uniformity of the brightness of the light exit surface.

Ferner ist bevorzugt, dass das über die eine Stirnseite eingekoppelte Licht eine andere Farbe besitzt als das über die andere Stirnseite eingekoppelte Licht, so dass mit einem Lichtleiter zwei Lichtfunktionen erfüllt werden können.Furthermore, it is preferred that the light coupled in via one end face has a different color than the light coupled in via the other end face, so that two light functions can be fulfilled with one light guide.

Es ist aber auch möglich und bevorzugt, beide Lichtfarben über eine einzige Stirnseite einzukoppeln. Dies hat den Vorteil, dass nur eine Leiterplatte und nur ein Stecker zur Stromversorgung und Steuerung der Lichtquellen erforderlich sind.However, it is also possible and preferred to couple in both light colors via a single end face. The advantage of this is that only one printed circuit board and one plug are required to power and control the light sources.

Eine dazu alternative Ausgestaltung zeichnet sich dadurch aus, dass das Leuchtenmodul eine unterhalb der Dickwandoptik angeordnete zweite transparente Lichtscheibe aufweist.An alternative configuration to this is characterized in that the lighting module has a second transparent lens arranged below the thick-wall optics.

Bevorzugt ist auch, dass die beiden Lichtscheiben an einem Ende oder an beiden seitlichen Enden des zweiten Lichtleiters, die weder als Lichteintrittsfläche noch als Lichtaustrittsfläche dienen, ineinander übergehen, so dass der zweite Lichtleiter mit Ausnahme seiner Lichteintrittsfläche und seiner Lichtaustrittsfläche von einer im Raum gekrümmten Lichtscheibe eingehüllt wird.It is also preferred that the two light discs merge into one another at one end or at both lateral ends of the second light guide, which serve neither as a light entry surface nor as a light exit surface, so that the second light guide, with the exception of its light entry surface and its light exit surface, has a light disc that is curved in space is enveloped.

Weitere Vorteile ergeben sich aus den abhängigen Ansprüchen, der Beschreibung und den beigefügten Figuren.Further advantages result from the dependent claims, the description and the accompanying figures.

Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It goes without saying that the features mentioned above and those still to be explained below can be used not only in the combination specified in each case, but also in other combinations or on their own, without departing from the scope of the present invention.

Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden in der nachfolgenden Beschreibung näher erläutert. Dabei bezeichnen gleiche Bezugszeichen in verschiedenen Figuren jeweils gleiche oder zumindest ihrer Funktion nach vergleichbare Elemente. Es zeigen, jeweils in schematischer Form:

Figur 1
eine perspektivische Darstellung eines Ausführungsbeispiels eines erfindungsgemäßen Leuchtenmoduls; und
Figur 2
einen Querschnitt durch das Leuchtenmodul nach der Figur 1.
Embodiments of the invention are shown in the drawings and are explained in more detail in the following description. The same reference symbols in different figures denote the same elements or elements that are at least comparable in terms of their function. They show, each in schematic form:
figure 1
a perspective view of an embodiment of a lighting module according to the invention; and
figure 2
a cross section through the lighting module according to the figure 1 .

Im Einzelnen zeigt die Figur 1 ein Leuchtenmodul 10 für eine Kraftfahrzeugbeleuchtungseinrichtung, das einen langgestreckten ersten Lichtleiter 12, einen zweiten Lichtleiter 14 und zwei Lichtscheiben 16 und 18 aufweist. Die Figur 2 zeigt den Gegenstand der Figur 1 in einem seitlichen Querschnitt.In detail, the figure 1 a lamp module 10 for a motor vehicle lighting device, which has an elongated first light guide 12, a second light guide 14 and two lenses 16 and 18. the figure 2 shows the subject of figure 1 in a lateral cross section.

Die x-Richtung 10 gibt eine Hauptabstrahlrichtung des Leuchtenmoduls an. Bei einer bestimmungsgemäßen Verwendung des Leuchtenmoduls 10 in einer Kraftfahrzeugbeleuchtungseinrichtung eines Kraftfahrzeugs, beispielsweise in einem Scheinwerfer, ist die x-Richtung zum Beispiel parallel zu einer Längsachse des Fahrzeugs. Die y-Richtung liegt parallel zu einer Querachse des Fahrzeugs, und die z-Richtung liegt parallel zu einer Hochachse des Fahrzeugs und weist nach oben. Dies ist aber nur ein Beispiel und soll die Erfindung nicht einschränken.The x-direction 10 indicates a main emission direction of the lighting module. When the lamp module 10 is used as intended in a motor vehicle lighting device of a motor vehicle, for example in a headlight, the x-direction is parallel to a longitudinal axis of the vehicle, for example. The y-direction is parallel to a lateral axis of the vehicle and the z-direction is parallel to a vertical axis of the vehicle and points upwards. However, this is only an example and is not intended to limit the invention.

Der erste Lichtleiter 12 weist eine sich längs des langgestreckten ersten Lichtleiters 12 erstreckende Lichtaustrittsfläche 20 auf. Der zweite Lichtleiter 14 weist eine der Lichtaustrittsfläche 20 des ersten Lichtleiters 12 entlang ihrer Längserstreckung gegenüberliegende und als Lichteintrittsfläche dienende erste Schmalseite 22 und eine als Lichtaustrittsfläche dienende zweite Schmalseite 24 auf. Die zweite Schmalseite 24 ist von der ersten Schmalseite 22 durch zwischen den Schmalseiten 22, 24 liegende Breitseiten 26, 28 des zweiten Lichtleiters 14 getrennt.The first light guide 12 has a light exit surface 20 extending along the elongated first light guide 12 . The second light guide 14 has a first narrow side 22 that is opposite the light exit surface 20 of the first light guide 12 along its length and serves as a light entry surface, and a second narrow side 24 that serves as a light exit surface. The second narrow side 24 is separated from the first narrow side 22 by broad sides 26, 28 of the second lying between the narrow sides 22, 24 Light guide 14 separately.

Die transparente Lichtscheibe 16 erstreckt sich von der zweiten Schmalseite 24 des zweiten Lichtleiters 14 aus in Richtung zur ersten Schmalseite 22 des zweiten Lichtleiters 14. Diese Richtung ist im Wesentlichen entgegengesetzt zur Hauptabstrahlrichtung. Quer dazu erstreckt sich die transparente Lichtscheibe 16 entlang der Längserstreckung der Schmalseiten 22, 24 des zweiten Lichtleiters. Die Längserstreckung verläuft in diesem Beispiel im Wesentlichen parallel zur y-Richtung.The transparent lens 16 extends from the second narrow side 24 of the second light guide 14 in the direction of the first narrow side 22 of the second light guide 14. This direction is essentially opposite to the main emission direction. The transparent lens 16 extends transversely thereto along the longitudinal extent of the narrow sides 22, 24 of the second light guide. In this example, the longitudinal extent runs essentially parallel to the y-direction.

Die Lichtscheibe 16 weist eine der Breitseite 26 des zweiten Lichtleiters 14 abgewandte Seitenfläche 16.1 auf. Diese Seitenfläche 16.1 ist je nach gestalterischer Vorgabe klar, mattiert oder mit Oberflächenstrukturen versehen, die den Betrachter visuell ansprechen sollen, aber keine lichttechnische Wirkung entfalten. Die Lichtscheibe 16 kann als für das Erscheinungsbild gestaltbare Fläche genutzt werden, während die Breitseite 26 für die die Optimierung der optischen Funktion der Dickwandoptik verwendet werden kann. Dies gilt analog für die Breitseite 28 und die Lichtscheibe 18.The lens 16 has a side surface 16.1 facing away from the broad side 26 of the second light guide 14. Depending on the design specification, this side surface 16.1 is clear, frosted or provided with surface structures which are intended to appeal to the viewer visually but do not have any lighting effect. The lens 16 can be used as a surface that can be designed for the appearance, while the broad side 26 can be used to optimize the optical function of the thick-wall optics. This applies analogously to the broad side 28 and the lens 18.

Die Dickwandoptik, also der zweite Lichtleiter 14, weist erfindungsgemäß, wie insbesondere aus Figur 2 ersichtlich ist, einen von seiner Lichteintrittsfläche 22 zu seiner Lichtaustrittsfläche 24 monoton zunehmenden Querschnitt auf. Auch ein parabelförmiger Querschnitt oder eine Freiformfläche ist möglich. Durch den in Ausbreitungsrichtung des Lichtes im zweiten Lichtleiter zunehmenden Querschnitt des zweiten Lichtleiters ergibt sich als Folge interner Totalreflexionen eine Parallelisierung des Lichtes. Dies trägt zu einer angestrebten Homogenität der vom Inneren des zweiten Lichtleiters 14 aus erfolgenden Ausleuchtung seiner Lichtaustrittsfläche 24 bei. Außerdem vergrößert sich durch diese Form der Öffnungswinkel des Lichtes, das innerhalb des zweiten Lichtleiters interne Totalreflexionen erfährt. Dies erhöht die Effizienz des Lichtleiters, also das Verhältnis von gezielt ausgekoppeltem Licht zum eingekoppelten Licht.The thick-wall optics, ie the second light guide 14, has according to the invention, as in particular figure 2 as can be seen, has a cross section which increases monotonously from its light entry surface 22 to its light exit surface 24 . A parabolic cross section or a free-form surface is also possible. The cross section of the second light guide, which increases in the direction of propagation of the light in the second light guide, results in a parallelization of the light as a result of internal total reflections. This contributes to a desired homogeneity of the interior of the second Light guide 14 from occurring illumination of its light exit surface 24 at. In addition, this shape increases the opening angle of the light that experiences total internal reflections within the second light guide. This increases the efficiency of the light guide, i.e. the ratio of light that is specifically coupled out to the light that is coupled in.

Die seitlichen Oberflächen, also die Breitseiten 26, 28 des zweiten Lichtleiters 14, sind bevorzugt spiegelglatt, was praktisch verlustlose interne Totalreflexionen ermöglicht. Diese lichttechnische Wirkung der praktisch verlustlosen internen Totalreflexion trägt zu einer angestrebten hohen Effizienz bei.The lateral surfaces, ie the broad sides 26, 28 of the second light guide 14 are preferably mirror-smooth, which enables total internal reflections that are practically lossless. This photometric effect of the practically lossless total internal reflection contributes to the desired high efficiency.

Die Lichtaustrittsfläche 24 der Dickwandoptik 14 ist, je nach lichttechnischer und gestalterischer Anforderung, glatt oder gestuft oder mit streuenden, kissenförmigen Optiken versehen. Dies gilt analog für die Lichteintrittsfläche 22 der Dickwandoptik 14, die demnach ebenfalls glatt oder gestuft oder mit streuenden, kissenförmigen Optiken versehen sein kann. Stufen werden bevorzugt ab einem Pfeilungswinkel von 30° vorgesehen. Unter einer Pfeilung wird dabei verstanden, dass die Lichtaustrittsfläche (im Fall eines gestuften Lichtleiters eine Einhüllende) der Lichtaustrittsfläche eine Winkel mit der Querachse des Fahrzeugs einschließt. fThe light exit surface 24 of the thick-wall optics 14 is smooth or stepped or provided with scattering, pillow-shaped optics, depending on the lighting and design requirements. This applies analogously to the light entry surface 22 of the thick-wall optics 14, which can accordingly also be smooth or stepped or provided with scattering, pillow-shaped optics. Steps are preferably provided from a sweep angle of 30°. A sweep is understood to mean that the light exit surface (in the case of a stepped light guide, an envelope) of the light exit surface encloses an angle with the transverse axis of the vehicle. f

Im ersten Lichtleiter 12 propagiert von einer in der Figur nicht dargestellten Lichtquelle in eine Stirnfläche 12.1 des ersten Lichtleiters 12 eingespeistes Licht im Wesentlichen entlang des ersten Lichtleiters 12. Dabei erfährt das Licht an einer glatten Lichtaustrittsfläche 20 und an glatten Seitenwänden 12.2 des ersten Lichtleiters 12 interne Totalreflexionen. Eine der Lichtaustrittsfläche 20 des ersten Lichtleiters 12 gegenüberliegende, langgestreckte Rückseite 12.2 des ersten Lichtleiters 12 weist lichtumlenkende Strukturen auf, die zum Beispiel prismenförmig sind. Diese Strukturen lenken auf sie auftreffendes Licht so steil zur Lichtaustrittsfläche 20 des langgestreckten ersten Lichtleiters 12 um, dass das umgelenkte Licht über die langgestreckte Lichtaustrittsfläche 20 des ersten Lichtleiters 12 verteilt austritt und über die der Lichtaustrittsfläche 20 des ersten Lichtleiters 12 gegenüberliegende Lichteintrittsfläche 22 des zweiten Lichtleiters 14 in den zweiten Lichtleiter 14 eintritt.In the first light guide 12, light fed from a light source (not shown in the figure) into an end face 12.1 of the first light guide 12 propagates essentially along the first light guide 12. The light experiences internal light on a smooth light exit surface 20 and on smooth side walls 12.2 of the first light guide 12 total reflections. One of the light exit surface 20 of the first light guide 12 opposite, The elongated rear side 12.2 of the first light guide 12 has light-deflecting structures that are prism-shaped, for example. These structures deflect light impinging on them so steeply to the light exit surface 20 of the elongated first light guide 12 that the deflected light emerges distributed over the elongated light exit surface 20 of the first light guide 12 and via the light exit surface 20 of the first light guide 12 opposite the light entry surface 22 of the second light guide 14 enters the second light guide 14 .

In einer bevorzugten Ausgestaltung werden zwei Lichtfarben über eine einzige Stirnseite des langgestreckten ersten Lichtleiters 12 in den Lichtleiter 12 eingekoppelt. Möglich ist aber auch, dass der langgestreckte erste Lichtleiter 12 von einer seiner beiden Stirnseiten 12.1, 12.4 her mit Licht gespeist. Dabei kann das über die eine Stirnseite eingekoppelte Licht die gleiche Farbe besitzen wie das über die andere Stirnseite eingekoppelte Licht. In einer alternativen Ausgestaltung kann das über die eine Stirnseite eingekoppelte Licht eine andere Farbe besitzen als das über die andere Stirnseite eingekoppelte Licht. Auf diese Weise kann zum Beispiel eine gelbes oder gelb-rotes Licht verwendende Blinklichtfunktion mit der gleichen Anordnung aus erstem Lichtleiter, Dickwandoptik und Lichtscheibe verwirklicht werden wie eine weißes Licht verwendende Tagfahrlichtlichtfunktion oder Positionslichtfunktion.In a preferred embodiment, two colors of light are coupled into the light guide 12 via a single end face of the elongated first light guide 12 . However, it is also possible for the elongated first light guide 12 to be supplied with light from one of its two end faces 12.1, 12.4. In this case, the light coupled in via one end face can have the same color as the light coupled in via the other end face. In an alternative configuration, the light coupled in via one end face can have a different color than the light coupled in via the other end face. In this way, for example, a flashing light function using yellow or yellow-red light can be implemented with the same arrangement of first light guide, thick-wall optics and lens as a daytime running light function or position light function using white light.

In der dargestellten Ausgestaltung weist das Leuchtenmodul 10 eine unterhalb der Dickwandoptik 24 angeordnete zweite transparente Lichtscheibe 18 auf. Die beiden Lichtscheiben 16, 18 können auch an einem Ende oder an beiden seitlichen Enden der Dickwandoptik 14, also an den beiden Seiten der Dickwandoptik 14, die im dargestellten Ausführungsbeispiel weder als Lichteintrittsfläche 22 noch als Lichtaustrittsfläche 24 dienen, ineinander übergehen, so dass die Dickwandoptik 14 mit Ausnahme ihrer Lichteintrittsfläche 22 und ihrer Lichtaustrittsfläche 24 von einer im Raum gekrümmten Lichtscheibe eingehüllt wird.In the configuration shown, the lamp module 10 has a second transparent lens 18 arranged below the thick-wall optics 24 . The two lenses 16, 18 can also be at one end or at both lateral ends of the thick-wall optics 14, ie on both sides of the Thick-wall optics 14, which in the illustrated embodiment serve neither as a light entry surface 22 nor as a light exit surface 24, merge into one another, so that the thick-wall optics 14, with the exception of its light entry surface 22 and its light exit surface 24, is enveloped by a lens that is curved in space.

Claims (11)

  1. Light module (10) for a motor vehicle lighting system, with an elongated first light guide (12) comprising a light output surface (20) extending lengthwise along the elongated first light guide (12), and with a second light guide (14) comprising a first narrow side (22) opposite the light output surface (20) of the first light guide (12) along its length and serving as a light intake surface, and a second narrow side (24) serving as a light output surface, separated from the first narrow side (22) by broad sides (26, 28) of the second light guide (14) between the narrow sides (22, 24), and with at least one transparent light pane (16, 18) extending from the second narrow side (24) of the second light guide (14) toward its first narrow side (22) and along the length of the narrow sides (22, 24) of the second light guide (14), characterised in that the second light guide (14) comprises a monotonously increasing cross section from its light intake surface (22) to its light output surface (24).
  2. Light module (10) as per claim 1, characterised in that the light pane (16) comprises a side surface (16.1) facing away from a broad side (26) of the second light guide (14) that is clear, frosted, or equipped with surface structures.
  3. Light guide (10) as per one of the preceding claims, characterised in that the broad sides (26, 28) of the second light guide (14) are glassy.
  4. Light guide (10) as per one of the preceding claims, characterised in that the light output surface (24) of the second light guide (14) is smooth or staggered or equipped with disseminating, pillow-shaped optical units.
  5. Light module (10) as per one of the preceding claims, characterised in that the light intake surface (22) of the second light guide (14) is smooth or staggered or equipped with disseminating, pillow-shaped optical units.
  6. Light module (10) as per one of the preceding claims, characterised in that an elongated back side (12.3) of the first light guide (12) opposite the light output surface (20) of the first light guide (12) comprises prism-shaped, light-redirecting structures.
  7. Light module (10) as per one of the preceding claims, characterised in that the elongated first light guide (12) receives light from its two front sides (12.1, 12.4) .
  8. Light module (10) as per claim 7, characterised in that the light coupled via the one front side is the same colour as the light coupled via the other front side.
  9. Light module (10) as per claim 7, characterised in that the light coupled via the one front side is a different colour than the light coupled via the other front side.
  10. Light module (10) as per one of the preceding claims, characterised in that the light module (10) comprises a second transparent light pane (18) beneath the second light guide (14).
  11. Light module (10) as per claim 10, characterised in that the two light panes (16, 18) overlap each other on one end or both side ends of the second light guide (14), which serve as neither a light intake surface nor as a light output surface, so that the second light guide (14), with the exception of its light intake surface and light output surface, is covered by a spatially curved light pane.
EP16200635.7A 2015-12-02 2016-11-25 Light module comprising two light guides Active EP3176494B1 (en)

Applications Claiming Priority (1)

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DE202015008368.4U DE202015008368U1 (en) 2015-12-02 2015-12-02 Luminaire module with a thick-walled look

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CN207262329U (en) * 2017-04-27 2018-04-20 法雷奥照明湖北技术中心有限公司 Beam steering devices and vehicle lamp assembly
CN108980773A (en) * 2018-10-19 2018-12-11 华域视觉科技(上海)有限公司 Multi-angle light guide and be used for car light lamps and lanterns
EP3779272A1 (en) 2019-08-14 2021-02-17 ZKW Group GmbH Lighting device for a motor vehicle headlight
TWI761275B (en) * 2021-08-05 2022-04-11 坦德科技股份有限公司 Vehicle signal lamp structure and vehicle daytime running lamp

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US5506929A (en) * 1994-10-19 1996-04-09 Clio Technologies, Inc. Light expanding system for producing a linear or planar light beam from a point-like light source
DE102006032373A1 (en) * 2006-07-13 2008-01-17 Automotive Lighting Reutlingen Gmbh Lamp e.g. motor vehicle head lamp, arrangement, has light source emitting light in switch-on condition, where light is coupled in light conductive unit that includes light emission surfaces and design surfaces
WO2008016978A1 (en) * 2006-08-01 2008-02-07 3M Innovative Properties Company Illumination device
DE102011076621B4 (en) * 2011-05-27 2017-03-02 Automotive Lighting Reutlingen Gmbh Lighting device for a motor vehicle
JP2013191406A (en) * 2012-03-14 2013-09-26 Koito Mfg Co Ltd Vehicle lamp
JP6050048B2 (en) * 2012-08-01 2016-12-21 株式会社小糸製作所 Vehicle lighting
JP6251985B2 (en) * 2013-05-31 2017-12-27 市光工業株式会社 Vehicle lighting

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