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EP3176494A1 - Light module comprising two light guides - Google Patents

Light module comprising two light guides Download PDF

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Publication number
EP3176494A1
EP3176494A1 EP16200635.7A EP16200635A EP3176494A1 EP 3176494 A1 EP3176494 A1 EP 3176494A1 EP 16200635 A EP16200635 A EP 16200635A EP 3176494 A1 EP3176494 A1 EP 3176494A1
Authority
EP
European Patent Office
Prior art keywords
light
light guide
luminaire module
exit surface
narrow side
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP16200635.7A
Other languages
German (de)
French (fr)
Other versions
EP3176494B1 (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
Original Assignee
Automotive Lighting Reutlingen 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 Automotive Lighting Reutlingen GmbH filed Critical Automotive Lighting Reutlingen GmbH
Publication of EP3176494A1 publication Critical patent/EP3176494A1/en
Application granted granted Critical
Publication of EP3176494B1 publication Critical patent/EP3176494B1/en
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Anticipated expiration legal-status Critical

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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 second light guide is also referred to below as thick-wall optics.
  • a luminaire module is here assumed to be known per se and serves to generate a signal light distribution such as a daytime running light distribution.
  • the second light guide has in one embodiment mainly the function a design element.
  • the lying between the narrow sides of the thick-walled broadsides serve on the one hand as transport surfaces on which experiences the light propagating from the light entrance surface of the thick-walled optics to the light exit surface internal total internal reflections.
  • At least one of the broadsides is often visible from the outside. This is especially true for headlights, which also accommodate other light modules and therefore have a large light exit opening, which is often covered by a smooth cover.
  • headlights which also accommodate other light modules and therefore have a large light exit opening, which is often covered by a smooth cover.
  • the broadsheets often their appearance has a higher priority than an optimization of these areas in terms of lighting technology. If, for example, matting of the broad sides is provided 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 in the interior of the second light guide on the frosted surface are internal Total reflections worsen.
  • the transparent lens covers the broadsides and is therefore more visible to the viewer than the broadside of the thick-walled optical system 14 lying behind the transparent lens for the viewer.
  • the transparent lens can, for example, have a matting for reasons of design.
  • the lying for the viewer behind the transparent cover broadside can be optimized without regard to design requirements in lighting terms. In particular, it can be mirror-smooth, in order to allow lossless internal total reflections. Since both the lens and the thick-walled optics are transparent, the appearance of the luminaire module according to the invention is similar to the appearance of a thick-walled 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.
  • a free-form surface or a parabolic shape is also conceivable.
  • the broad sides of the second light guide are mirror-smooth.
  • a further preferred embodiment is characterized in that the light exit surface of the second light guide 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 which are prism-shaped.
  • a further preferred embodiment is characterized in that the elongate first light guide is fed with light from its two end faces.
  • the light coupled in via the 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.
  • the two light disks 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 entrance surface and its light exit surface of a light disc curved in space is shrouded.
  • FIG. 1 a luminaire module 10 for a motor vehicle lighting device, which has an elongate first optical waveguide 12, a second optical waveguide 14 and two light disks 16 and 18.
  • the FIG. 2 shows the subject of the FIG. 1 in a lateral cross-section.
  • the x-direction 10 indicates a main emission direction of the luminaire module.
  • the x direction is, for example, parallel to a longitudinal axis of the vehicle.
  • the y-direction is parallel to a transverse axis of the vehicle, and the z-direction is parallel to a vertical axis of the vehicle and faces upward. But this is only an example and is not intended to limit the invention.
  • the thick-walled optics that is to say the second optical waveguide 14 has, as in particular FIG. 2 can be seen, one of its light entry surface 22 to its light exit surface 24 monotonically increasing cross-section. Also, a parabolic cross-section or a free-form surface is possible. Due to the increasing in the propagation direction of the light in the second light guide cross-section of the second light guide results in a parallelization of the light as a result of total internal reflections. This contributes to a desired homogeneity of the illumination of its light exit surface 24 taking place from the interior of the second optical waveguide 14. In addition, this form of the opening angle of the light increases, which undergoes internal total reflections within the second light guide. This increases the efficiency of the light guide, ie the ratio of specifically coupled light to the coupled light.
  • the lateral surfaces that is, the broad sides 26, 28 of the second light guide 14, are preferably mirror-smooth, which allows virtually lossless internal total reflections. This photometric effect of virtually lossless total internal reflection contributes to a high level of efficiency.
  • the light exit surface 24 of the thick-walled optical system 14 is, depending on lighting and design requirements, smooth or stepped or provided with scattering, pillow-shaped optics. This applies analogously to the light entry surface 22 of the thick-walled optical system 14, which accordingly can 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 forms an angle with the transverse axis of the vehicle. f
  • first light guide 12 propagates from a light source, not shown in the figure, in an end face 12.1 of the first light guide 12 substantially along the first light guide 12.
  • the light experiences at a smooth light exit surface 20 and smooth side walls 12.2 of the first light guide 12 internal total reflections.
  • One of the light exit surface 20 of the first light guide 12 opposite, elongated rear side 12.2 of the first light guide 12 has light-deflecting structures, which are, for example prismatic.
  • These structures deflect light impinging on them so steeply toward the light exit surface 20 of the elongate first light guide 12 that the deflected light is distributed over the elongated light exit surface 20 of the first light guide 12 exits and on the light exit surface 20 of the first light guide 12 opposite light entrance surface 22 of the second light guide 14 enters the second light guide 14.
  • two light colors are coupled into the light guide 12 via a single end face of the elongated first light guide 12.
  • the light coupled in via the one end side can have the same color as the light coupled in via the other end side.
  • the light coupled in via the one end face may 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 realized with the same arrangement of first light guide, thick wall optic and lens as a daytime running light function using white light or position light function.
  • the lamp module 10 has a second transparent lens 18 arranged below the thick-wall optical system 24.
  • the two light disks 16, 18 can also merge into one another at one end or at both lateral ends of the thick-wall optical system 14, that is to say on the two sides of the thick-wall optical system 14 which serve neither as a light entry surface 22 nor as a light exit surface 24 in the exemplary embodiment shown, so that the thick-wall optical system 14 with the exception of its light entry surface 22 and its light exit surface 24 is enveloped by a curved in space lens.

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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)

Abstract

Die Erfindung betrifft ein Leuchtenmodul (10) für eine Kraftfahrzeugbeleuchtungseinrichtung, mit einem langgestreckten ersten Lichtleiter (12), der eine sich längs des langgestreckten ersten Lichtleiters (12) erstreckende Lichtaustrittsfläche (20) aufweist, und mit einem zweiten Lichtleiter (14), der 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) aufweist, die von der ersten Schmalseite (22) durch zwischen den Schmalseiten (22, 24) liegende Breitseiten (26, 28) des zweiten Lichtleiters (14) getrennt sind, wobei das Leuchtenmodul (10) wenigstens eine transparente Lichtscheibe (16, 18) aufweist, die sich von der zweiten Schmalseite (24) des zweiten Lichtleiters (14) aus in Richtung zu dessen erster Schmalseite (22) erstreckt und die sich längs der Längserstreckung der Schmalseiten (22, 24) des zweiten Lichtleiters (14) erstreckt.

Figure imgaf001
The invention relates to a lighting module (10) for a motor vehicle lighting device, comprising an elongated first optical waveguide (12) having a light exit surface (20) extending along the elongate first optical waveguide (12), and a second optical waveguide (14) having a second optical waveguide (12) the light exit surface (20) of the first light guide (12) along its longitudinal extension and serving as a light entrance surface first narrow side (22) and serving as a light exit surface second narrow side (24) extending from the first narrow side (22) between the narrow sides (22 , 24) lying broad sides (26, 28) of the second light guide (14) are separated, wherein the lamp module (10) has at least one transparent lens (16, 18) extending from the second narrow side (24) of the second light guide (14 ) extends in the direction of its first narrow side (22) and along the longitudinal extent of the narrow sides (22, 2 4) of the second light guide (14).
Figure imgaf001

Description

Die vorliegende Erfindung betrifft ein Leuchtenmodul für eine Kraftfahrzeugbeleuchtungseinrichtung, mit einem langgestreckten ersten Lichtleiter, der eine sich längs des langgestreckten ersten Lichtleiters erstreckende Lichtaustrittsfläche aufweist, und mit einem zweiten Lichtleiter, der eine der Lichtaustrittsfläche des ersten Lichtleiters entlang ihrer Längserstreckung gegenüberliegende und als Lichteintrittsfläche dienende erste Schmalseite und eine als Lichtaustrittsfläche dienende zweite Schmalseite aufweist, die von der ersten Schmalseite durch zwischen den Schmalseiten liegende Breitseiten des Lichtleiters getrennt sind.The present invention relates to a luminaire module for a motor vehicle lighting device, comprising an elongate first optical waveguide having a light exit surface extending along the elongated first optical waveguide, and a second optical waveguide having a first optical waveguide opposite the light exit surface of the first optical waveguide along its longitudinal extension and serving as a light entry surface Has narrow side and serving as a light exit surface second narrow side, which are separated from the first narrow side by lying between the narrow sides broad sides of the light guide.

Der zweite Lichtleiter wird im Folgenden auch als Dickwandoptik bezeichnet. Ein solches Leuchtenmodul wird hier als per se bekannt vorausgesetzt und 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 luminaire module is here assumed to be known per se and serves to generate a signal light distribution such as a daytime running light distribution. The second light guide has in one embodiment mainly the function 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 lying between the narrow sides of the thick-walled broadsides serve on the one hand as transport surfaces on which experiences the light propagating from the light entrance surface of the thick-walled optics to the light exit surface internal 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.At least one of the broadsides is often visible from the outside. This is especially true for headlights, which also accommodate other light modules and therefore have a large light exit opening, which is often covered by a smooth cover. When designing the broadsheets often their appearance has a higher priority than an optimization of these areas in terms of lighting technology. If, for example, matting of the broad sides is provided 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 in the interior of the second light guide on the frosted surface are internal Total reflections worsen.

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 in the specification of a lighting device of the type mentioned, in which the greatest possible freedom of design is not at the expense of the efficiency and homogeneity of the appearance of the light exit surface of the thick-walled optics.

Diese Aufgabe wird mit den Merkmalen des Anspruchs 1 gelöst. Die erfindungsgemäße Beleuchtungseinrichtung unterscheidet sich von dem Stand der Technik dadurch, dass sie wenigstens eine transparente Lichtscheibe aufweist, 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.This object is achieved with the features of claim 1. The illumination device according to the invention differs from the prior art in that it has at least one transparent lens which extends from the second narrow side of the second light guide extends in the direction of the first narrow side and extending along the longitudinal extent of the narrow sides of the second light guide.

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 broadsides and is therefore more visible to the viewer than the broadside of the thick-walled optical system 14 lying behind the transparent lens for the viewer. The transparent lens can, for example, have a matting for reasons of design. The lying for the viewer behind the transparent cover broadside can be optimized without regard to design requirements in lighting terms. In particular, it can be mirror-smooth, in order to allow lossless internal total reflections. Since both the lens and the thick-walled optics are transparent, the appearance of the luminaire module according to the invention is similar to the appearance of a thick-walled 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.

Bevorzugt ist auch, dass der zweite Lichtleiter einen von seiner Lichteintrittsfläche zu seiner Lichtaustrittsfläche monoton zunehmenden Querschnitt aufweist. Auch eine Freiformfläche oder eine Parabelform ist denkbar.It is also preferred that the second light guide has a monotonically increasing cross section from its light entry surface to its light exit surface. A free-form surface or a parabolic shape is also 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 mirror-smooth.

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 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 which 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.A further preferred embodiment is characterized in that the elongate first light guide is fed with light from its two 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 the one end face has the same color as the light coupled in via the other end face. This improves 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 the 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. This has the advantage that only one printed circuit board and only one plug for power supply and control of the light sources are required.

Eine dazu alternative Ausgestaltung zeichnet sich dadurch aus, dass das Leuchtenmodul eine unterhalb der Dickwandoptik angeordnete zweite transparente Lichtscheibe aufweist.An alternative embodiment is characterized by this in that the luminaire module has a second transparent lens arranged beneath the thick-wall optical system.

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 disks 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 entrance surface and its light exit surface of a light disc curved in space is shrouded.

Weitere Vorteile ergeben sich aus den abhängigen Ansprüchen, der Beschreibung und den beigefügten Figuren.Further advantages will be apparent from the dependent claims, the description and the attached 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 is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, 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 illustrated in the drawings and are explained in more detail in the following description. In this case, the same reference numerals in different figures denote the same or at least functionally comparable elements. In each case, in schematic form:
FIG. 1
a perspective view of an embodiment of a lamp module according to the invention; and
FIG. 2
a cross section through the lamp module after the FIG. 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 shows FIG. 1 a luminaire module 10 for a motor vehicle lighting device, which has an elongate first optical waveguide 12, a second optical waveguide 14 and two light disks 16 and 18. The FIG. 2 shows the subject of the FIG. 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 luminaire module. When the luminaire 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, for example, parallel to a longitudinal axis of the vehicle. The y-direction is parallel to a transverse axis of the vehicle, and the z-direction is parallel to a vertical axis of the vehicle and faces upward. But 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 optical waveguide 14 has a first narrow side 22 opposite to the light exit surface 20 of the first optical waveguide 12 along its longitudinal extension and serving as a light entry surface, and a second narrow side 24 serving as a light exit surface. The second narrow side 24 is separated from the first narrow side 22 by wide sides 26, 28 of the second light guide 14 lying between the narrow sides 22, 24.

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 substantially opposite to the main emission. Across this extends the transparent lens 16 along the longitudinal extent of the narrow sides 22, 24 of the second light guide. The longitudinal extent in this example 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 lateral side 16.1 facing away from the broad side 26 of the second optical waveguide 14. Depending on the design specification, this side surface 16.1 is clear, matted or provided with surface structures which are intended to visually appeal to the observer, but do not develop a lighting-technical effect. The lens 16 can be used as an appearance-designable surface, while the broad-side 26 can be used for optimizing the optical function of the thick-walled optics. This applies analogously to the broad side 28 and the lens 18.

Die Dickwandoptik, also der zweite Lichtleiter 14 weist, 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-walled optics, that is to say the second optical waveguide 14, has, as in particular FIG. 2 can be seen, one of its light entry surface 22 to its light exit surface 24 monotonically increasing cross-section. Also, a parabolic cross-section or a free-form surface is possible. Due to the increasing in the propagation direction of the light in the second light guide cross-section of the second light guide results in a parallelization of the light as a result of total internal reflections. This contributes to a desired homogeneity of the illumination of its light exit surface 24 taking place from the interior of the second optical waveguide 14. In addition, this form of the opening angle of the light increases, which undergoes internal total reflections within the second light guide. This increases the efficiency of the light guide, ie the ratio of specifically coupled light to the coupled light.

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, that is, the broad sides 26, 28 of the second light guide 14, are preferably mirror-smooth, which allows virtually lossless internal total reflections. This photometric effect of virtually lossless total internal reflection contributes to a high level of 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-walled optical system 14 is, depending on lighting and design requirements, smooth or stepped or provided with scattering, pillow-shaped optics. This applies analogously to the light entry surface 22 of the thick-walled optical system 14, which accordingly can 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 forms 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 propagates from a light source, not shown in the figure, in an end face 12.1 of the first light guide 12 substantially along the first light guide 12. The light experiences at a smooth light exit surface 20 and smooth side walls 12.2 of the first light guide 12 internal total reflections. One of the light exit surface 20 of the first light guide 12 opposite, elongated rear side 12.2 of the first light guide 12 has light-deflecting structures, which are, for example prismatic. These structures deflect light impinging on them so steeply toward the light exit surface 20 of the elongate first light guide 12 that the deflected light is distributed over the elongated light exit surface 20 of the first light guide 12 exits and on the light exit surface 20 of the first light guide 12 opposite light entrance 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 light colors are coupled into the light guide 12 via a single end face of the elongated first light guide 12. But it is also possible that the elongated first optical fiber 12 fed from one of its two end faces 12.1, 12.4 forth with light. In this case, the light coupled in via the one end side can have the same color as the light coupled in via the other end side. In an alternative embodiment, the light coupled in via the one end face may 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 realized with the same arrangement of first light guide, thick wall optic and lens as a daytime running light function using white light or position light function.

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 illustrated embodiment, the lamp module 10 has a second transparent lens 18 arranged below the thick-wall optical system 24. The two light disks 16, 18 can also merge into one another at one end or at both lateral ends of the thick-wall optical system 14, that is to say on the two sides of the thick-wall optical system 14 which serve neither as a light entry surface 22 nor as a light exit surface 24 in the exemplary embodiment shown, so that the thick-wall optical system 14 with the exception of its light entry surface 22 and its light exit surface 24 is enveloped by a curved in space lens.

Claims (12)

Leuchtenmodul (10) für eine Kraftfahrzeugbeleuchtungseinrichtung, mit einem langgestreckten ersten Lichtleiter (12), der eine sich längs des langgestreckten ersten Lichtleiters (12) erstreckende Lichtaustrittsfläche (20) aufweist, und mit einem zweiten Lichtleiter (14), der 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) aufweist, die von der ersten Schmalseite (22) durch zwischen den Schmalseiten (22, 24) liegende Breitseiten (26, 28) des zweiten Lichtleiters (14) getrennt sind, dadurch gekennzeichnet, dass das Leuchtenmodul (10) wenigstens eine transparente Lichtscheibe (16, 18) aufweist, die sich von der zweiten Schmalseite (24) des zweiten Lichtleiters (14) aus in Richtung zu dessen erster Schmalseite (22) erstreckt und die sich längs der Längserstreckung der Schmalseiten (22, 24) des zweiten Lichtleiters (14) erstreckt.Luminaire module (10) for a motor vehicle lighting device, comprising an elongated first light guide (12) having a light exit surface (20) extending along the elongated first light guide (12), and a second light guide (14) having one of the light exit surface (20 ) of the first light guide (12) along its longitudinal extension and serving as a light entrance surface first narrow side (22) and serving as a light exit surface second narrow side (24) from the first narrow side (22) by between the narrow sides (22, 24) lying Broad sides (26, 28) of the second light guide (14) are separated, characterized in that the lamp module (10) has at least one transparent lens (16, 18) extending from the second narrow side (24) of the second light guide (14) extends in the direction of the first narrow side (22) and along the longitudinal extent of the narrow sides (22, 24) d it second optical fiber (14) extends. Leuchtenmodul (10) nach Anspruch 1, dadurch gekennzeichnet, dass die Lichtscheibe (16) eine einer Breitseite (26) des zweiten Lichtleiters (14) abgewandte Seitenfläche (16.1) aufweist, die klar, mattiert oder mit Oberflächenstrukturen versehen ist.Luminaire module (10) according to claim 1, characterized in that the lens (16) has a broad side (26) of the second light guide (14) facing away from side surface (16.1), which is clear, frosted or provided with surface structures. Leuchtenmodul (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der zweite Lichtleiter (14) einen von seiner Lichteintrittsfläche (22) zu seiner Lichtaustrittsfläche (24) monoton zunehmenden Querschnitt aufweist.Luminaire module (10) according to one of the preceding claims, characterized in that the second light guide (14) has a monotonic increasing from its light entry surface (22) to its light exit surface (24) cross-section. Leuchtenmodul (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Breitseiten (26, 28) des zweiten Lichtleiters (14) spiegelglatt sind.Luminaire module (10) according to one of the preceding claims, characterized in that the broad sides (26, 28) of the second light guide (14) are mirror-smooth. Leuchtenmodul (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Lichtaustrittsfläche (24) des zweiten Lichtleiters (14) glatt oder gestuft oder mit streuenden, kissenförmigen Optiken versehen ist.Luminaire module (10) according to one of the preceding claims, characterized in that the light exit surface (24) of the second light guide (14) is smooth or stepped or provided with scattering, pillow-shaped optics. Leuchtenmodul (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Lichteintrittsfläche (22) des zweiten Lichtleiters (14) glatt oder gestuft oder mit streuenden, kissenförmigen Optiken versehen ist.Luminaire module (10) according to one of the preceding claims, characterized in that the light entry surface (22) of the second light guide (14) is smooth or stepped or provided with scattering, pillow-shaped optics. Leuchtenmodul (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine der Lichtaustrittsfläche 20 des ersten Lichtleiters (12) gegenüberliegende langgestreckte Rückseite (12.3) des ersten Lichtleiters (12) lichtumlenkende Strukturen aufweist, die prismenförmig sind.Luminaire module (10) according to any one of the preceding claims, characterized in that one of the light exit surface 20 of the first light guide (12) opposite elongated rear side (12.3) of the first light guide (12) has light-deflecting structures which are prismatic. Leuchtenmodul (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der langgestreckte erste Lichtleiter (12) von seinen beiden Stirnseiten (12.1, 12.4) her mit Licht gespeist wird.Luminaire module (10) according to any one of the preceding claims, characterized in that the elongated first light guide (12) from its two end faces (12.1, 12.4) is fed with light. Leuchtenmodul (10) nach Anspruch 8, dadurch gekennzeichnet, dass das über die eine Stirnseite eingekoppelte Licht die gleiche Farbe besitzt wie das über die andere Stirnseite eingekoppelte Licht.Luminaire module (10) according to claim 8, characterized in that the light coupled via the one end has the same color as the light coupled via the other end face. Leuchtenmodul (10) nach Anspruch 8, dadurch gekennzeichnet, dass das über die eine Stirnseite eingekoppelte Licht eine andere Farbe besitzt als das über die andere Stirnseite eingekoppelte Licht.Luminaire module (10) according to claim 8, characterized in that the coupled via the one end side light has a different color than the coupled via the other end face light. Leuchtenmodul (10) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Leuchtenmodul (10) eine unterhalb des zweiten Lichtleiters (14) angeordnete zweite transparente Lichtscheibe (18) aufweist.Luminaire module (10) according to one of the preceding claims, characterized in that the luminaire module (10) has a second transparent light disc (18) arranged below the second optical waveguide (14). Leuchtenmodul (10) nach Anspruch 11, dadurch gekennzeichnet, dass die beiden Lichtscheiben (16, 18) an einem Ende oder an beiden seitlichen Enden des zweiten Lichtleiters (14), die weder als Lichteintrittsfläche noch als Lichtaustrittsfläche dienen, ineinander übergehen, so dass der zweite Lichtleiter (14) mit Ausnahme seiner Lichteintrittsfläche und seiner Lichtaustrittsfläche von einer im Raum gekrümmten Lichtscheibe eingehüllt wird.Luminaire module (10) according to claim 11, characterized in that the two light disks (16, 18) at one end or at both lateral ends of the second light guide (14), which serve neither as a light entry surface nor as a light exit surface merge into each other, so that the second light guide (14) with the exception of its light entry surface and its light exit surface is enveloped by a curved in space lens.
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