DE102013225950B4 - Automotive lighting device - Google Patents

Abstract

Motor vehicle lighting device (38), comprising at least one flat flat-shaped light guide (10) having a first Lichtleitfläche (12), one of the first Lichtleitfläche (12) opposite the second Lichtleitfläche (14), and between an edge (16) of the first Lichtleitfläche (12 ) and an edge (18) of the second light guide surface (14) and the first Lichtleitfläche (12) with the second Lichtleitfläche (14) connecting narrow sides (20), wherein a first region of the narrow sides (20) as a light exit surface (22) and a second region of the narrow sides is designed as a reflector (26), wherein the reflector (26) is adapted to direct a portion of the light emanating from at least one light source (34) and coupled into the light guide (10) in the direction of the light exit surface (22). to steer, characterized in that the illumination device has an imaging optics, which is set up and arranged by d The light exit surfaces to collect emerging light and directed in the apron of the illumination device that the illumination device (38) has a plurality of such light guide (10), which are arranged in a stack so that they lie one above the other when using the illumination device as intended, and that the Contact light guide surfaces (12, 14) of adjacent optical fibers (10) at least in a transition region (44) which is located on the light exit surface (22) of at least one of the contacting light guide (10), and that of the plurality of optical fibers (10) Light exit surface (22) is arranged near a reference axis (z) characterizing the illumination device (38), which serves as a reference direction with H = 0 ° and V = 0 ° for the angles in approval-relevant photometric measurements and when mounted on the vehicle, to focus the light coupled into it so that one of the illumination unit The light distribution has a brightness maximum lying in the apron of the illumination device (38), the concentration being effected by arranging the reflector of the light guide, whose light exit surface is arranged close to the reference axis, to emit the light emanating from the light source assigned to it to focus in a normal use of the illumination device horizontal plane to the optical axis of the imaging optics out.

Description

The invention relates to a motor vehicle lighting device according to the preamble of claim 1.

Such a motor vehicle lighting device with at least one plate-shaped flat light guide is made of DE 10 2011 089 481 A1 known. The light guide described therein has a first Lichtleitfläche, one of the first Lichtleitfläche opposite second Lichtleitfläche and between an edge of the first Lichtleitfläche and an edge of the second Lichtleitfläche and the first Lichtleitfläche with the second Lichtleitfläche connecting narrow sides. A first region of the narrow sides is formed as a light exit surface, a second region of the narrow sides is formed as a reflector. Furthermore, the light guide has a reflection surface, wherein the reflection surface is a depression in one of the two light guide surfaces, which extends into the light guide up to a certain depth. A light source is arranged so that light emanating from it illuminates the reflection surface and is reflected by it radially. From this radially reflected light incident on the reflector light is deflected there twice. In this case, the direction of the incident light during the deflection is reversed so that the further path of the deflected light between the reflection surface and the opposite light guide surface passes. This is achieved with a roof-shaped or v-shaped cross-section of the reflector through which the return path of the reflected light is parallel to the path of the incident light. This light guide uses the coupled light very efficiently for homogeneous illumination of the light exit surface. The light guide described has narrow strip-like longitudinally extended light exit surfaces. The ratio of width to height is large at these light exit surfaces.

From the US 2007/0145395 A1 a plate-shaped light guide is known in which a arranged below the light guide light source couples light. The light strikes a reflection surface arranged within the light guide, which reflects the incident light radially. The radially reflected light partially impinges on a reflector, which is a region of a narrow side of the light guide. Due to the curved shape of the reflector, the light is directed in the direction of the light exit surface. Here, the height of the light exit surface is determined by the height of the light guide. Light that is incident on the reflector near the vertex, starting from the reflection surface, is deflected only with losses to the light exit surface. The losses are caused by the fact that this light partly meets again on the reflection surface and is reflected at this or exits through refraction from the light guide.

From the DE 199 25 363 A1 is a plate-shaped flat trained light guide known. The light guide has a circular recess, in the center of which a light source is arranged. Light emanating from the light source is coupled into the light guide via the boundary surfaces of the recess. An area of the narrow side of the light guide is designed as a reflector. The reflector is shaped so that incident light is directed in the direction of a light exit surface. For this purpose, the reflector has a parabolic or elliptical shape. The disadvantage here is that light which impinges on this in the vicinity of a vertex of the reflector, is reflected back to the circular recess and thus does not or only partially reaches the light exit surface. This is therefore not homogeneous, that is illuminated with location-independent same brightness. In addition, here too the height of the light exit surface is determined by the height of the light guide plate. As a result, the light exit surface is strip-like.

From the DE 102 34 110 A1 It is known to arrange a plurality of light guide bodies, each of which has a light source associated with it, next to each other. At the light exit surface of each light guide further light guide in the form of Lichtleitstäben are arranged, whose light exit surfaces form a common matrix-like exit surface.

From the EP 1 850 064 A1 a lighting device is known which has stacked stacked, plate-shaped light guide.

The publication DE 10 2011 077 636 A1 shows a striping with horizontally juxtaposed optical fibers. The EP 2 169 296 A1 shows a lighting device with a single plate-shaped light guide. The EP 1 500 869 A1 and the DE 10 2004 047 301 A1 each show a light module with a half-shell reflector of light-conducting material. The DE 10 2008 015 131 A1 shows a semicircular light guide structure, the wall thickness of which increases from a light entrance surface in the circumferential direction. The DE 102 31 326 A1 shows a lighting unit for vehicles with light-guiding elements, which have parabolic first side surfaces and flattened second side surfaces. The light guide elements are joined together so that the flattened side surfaces are adjacent to each other and that they give a continuous flat plate with a band-shaped light exit surface.

Already known light guides are very efficient in terms of lighting, but have a flat, elongated light exit surface. In particular, it is problematic to achieve a light distribution in an apron of a motor vehicle with the said lighting devices, from the center to the edges of the light distribution a Illuminance course of a certain desired shape. An illumination intensity profile of a desired shape is required, for example, in the case of a rule-conforming spotlight distribution. A low-beam distribution or a high-beam distribution are examples of such a headlight distribution without the enumeration being meant conclusively.

Against this background, the object of the invention in the specification of a lighting device of the type mentioned, in the means of efficient light guide a large area exit surface is homogeneously illuminated and a rule compliant light distribution with a rule-compliant light distribution corresponding illuminance gradient with higher light levels in the center and to the side Rims towards specifically decreasing light values generated.

The object is achieved by a motor vehicle headlight with the features of claim 1.

The illumination device according to the invention is characterized inter alia by the fact that it has several of the light guide described in the preamble of claim 1, which are stacked arranged so that the light guide surfaces of adjacent optical fibers touch at least in a transition region, close to the light exit surface of at least one of touching optical fiber is located.

In this way, the respective flat, elongated light exit surfaces of the plurality of optical fibers in the vertical direction stacked on one another form a large common exit surface. The fact that the one of the plurality of optical waveguides, whose light exit surface is arranged near a reference axis characterizing the illumination device, is adapted to concentrate the light coupled into it in such a way that a light distribution generated by the illumination device has a brightness maximum lying ahead of the illumination device generates the higher light values in the center of the light distribution.

By the term "reference axis" is meant an axis characterizing the axis here. The legislator stipulates that the reference axis is specified by the manufacturer as an axis which serves as the reference direction (H = 0 °, V = 0 °) for the regulation-compliant mounting of the illumination device on the vehicle and as reference direction for the angles in the photometric measurements. H stands for the horizontal direction and V stands for the vertical direction. Consequently, the reference axis passes through the intersection of the major axes H, V of the rule-compliant light distribution.

The reference axis is expediently chosen such that it lies parallel to a main light exit direction of the illumination device. In lighting devices that have an imaging optics, often the optical axis of this imaging optics is selected as the reference axis.

In an advantageous embodiment it is provided that at least one of the plurality of plate-like optical fibers has a reflection surface, wherein the reflection surface is a rotationally symmetrical recess in one of the two Lichtleitfläche extending to a certain depth in the light guide and wherein the at least one light source arranged in that its light is coupled into the optical waveguide via the light guide surface opposite the depression and falls onto the reflection surface, the reflection surface being adapted to radially reflect light incident thereon, so that the rays propagate at shallow angles in the light guide and from Depending on the direction of the radial reflection, optical fibers can either be directed directly to the exit surface or be first deflected by the reflector on the narrow side, in order to then also be directed to the exit surface.

On the narrow side, the reflection takes place for example on a prism-like reflector, a so-called roof edge reflector, such that incident light is deflected twice and reversing the direction of the incident light is reversed so that the further path of the deflected light between the Well and the opposite light guide surface passes. Such designed light guides use the coupled-in light particularly effective for illuminating their light exit surface.

An advantageous embodiment is that an imaging optics is set up and arranged to direct light emerging through the light exit surfaces into the apron of the illumination device and that the light exit surfaces of the light guides are arranged in a region near the object-side focal surface of the imaging optics, in particular an imaging lens. Preferably, it is provided that the light exit surfaces of one or more light guides are arranged at a distance of up to a few millimeters from this focal surface. As a result, this light exit surface is not sharply imaged in the resulting light distribution. In the blurred image, bundles of rays emanating from different light exit surfaces overlap, giving the observer the impression of a large, uniformly illuminated exit surface.

It is also advantageous that at least one of the optical fibers in contact with the transition region is adapted to allow light propagating in it to emerge in such a way that it partially mixes with the light originating from an adjacent optical fiber. This gives the viewer the impression of a large and homogeneously illuminated exit surface. The mixing of the beam paths is achieved by suitable measures. For example, the contact surfaces of the respective optical waveguides are locally connected to one another in terms of light, so that light in the transition region near the light exit surface transitions from one optical waveguide into the other optical waveguide.

Furthermore, it is proposed that at least one of the plurality of light guides in subregions of its light exit surface or in subregions which lie close to its light exit surface have structures which are suitable for scattering the light propagating in the light guide. The scattered light of the individual light guides superimposed in the transition region near the light exit surfaces, so that the individual light exit surfaces appear together as a large homogeneous luminous exit surface.

It is preferred that the light exit surface of at least one of the plurality of stacked optical fibers is arranged below the reference axis of the illumination device. The light emanating from this light exit surface is imaged by the imaging optics in the apron of the illumination device above the reference axis. This produces a light distribution which has an illumination above a middle horizontal. In this way, for example, a high beam distribution is generated.

Furthermore, it is preferred that a diaphragm is arranged between the light exit surfaces and the imaging optics. The aperture is fixed or movable. The diaphragm has an aperture edge which lies in the object-side focal surface of the imaging optical system or can be moved into it so that the diaphragm completely or partially obscures light exit surfaces which are arranged below the optical axis of the imaging optical unit. The diaphragm edge is imaged by the imaging optics as a light-dark boundary in the apron of the illumination device. Thus, for example, a low-beam light distribution can be generated.

A further preferred embodiment provides that the light exit surface of at least one of the plurality of light guides is arranged in the object-side focal surface of the imaging optics. This light exit surface is then sharply imaged in the apron of the motor vehicle, so that the edge of the first light guide surface or the edge of the second light guide surface serves as a light-dark boundary.

Furthermore, it is preferred that a fixed diaphragm is arranged between the light exit surfaces and the imaging optics. The fixed aperture window-like limits the light exit surfaces of all the stacked optical fibers, so as to produce a desired appearance of the entire exit surface. In addition, portions of the light guides or their light exit surfaces, which should not be visible, are covered by the diaphragm. The fixed bezel can be used with the movable bezel.

A further embodiment provides that in at least one of the plurality of optical fibers, the first light guide surface and / or the second light guide surface form an angle with the light exit surface, which is not a right angle. It is also preferred that the first light-guiding surface and / or the second light-guiding surface have an angle not equal to zero degrees relative to one another over at least a partial region of their longitudinal extent, so that the thickness of the plate-shaped light conductor uniformly changes in the direction of the exit surface. In this case, either the light exit surface preferably deviates from a vertical position, or one of the two light guide surfaces or both light guide surfaces deviates from a horizontal position. In addition, the light exit surface of all or individual light guides can deviate from the vertical position. Depending on the combination different lighting effects can be achieved. Here are a few of them enumerated and described, without the enumeration is meant conclusively.

If, for example, the light exit surface is tilted upwards against the direction of light exit from the vertical, the exiting light is directed downwards with respect to the horizontal. A tilting of the light exit surface above in the light exit direction from the vertical leads to a deflection of the exiting light upwards with respect to the horizontal. Tilting of one or both light guide surfaces, which occurs in such a way that the light guide tapers in vertical planes (y-z planes) towards the light exit surface, causes the radiation beam to expand. The widening can be effected in such a way that the beams of the individual optical fibers are already superimposed in the transition region or take place only after passing through the light exit surfaces.

Tilting of one or both light guide surfaces, which takes place in such a way that the light guide widens in vertical planes (y-z planes) toward the light exit surface, results in that the aperture angle of the radiation beam is reduced.

The above-described positions of the light guide surfaces and the light exit surface to each other and / or to the main axes and combinations thereof and also the vertical and lateral extent of the light exit surfaces, as well as the shape of the reflector and the reflection surface are adapted to produce a desired, compliant light distribution.

A further embodiment provides that the plurality of optical fibers are arranged inclined to each other, so that their light exit surfaces are arranged radially about a horizontal axis. As a result, on the one hand, the light bundles emerging from the individual light exit surfaces are aligned with regard to their position to the total light distribution, on the other hand one gains space in the region of the light entry ends of the individual light guides, for example, to arrange heat sinks or the like.

A further advantage is that a light entry end of at least one of the plurality of optical fibers is angled relative to the transition region near the light exit surface by an angle with respect to the reference axis. The angle is preferably 90 °. This "cranked" design of the light guides, causes their expansion is reduced in the direction of the reference axis with respect to planar light guides, whereby a particularly compact design of the lighting device is possible in this direction.

It is also advantageous that at least one of the light guides is designed stepwise in the direction of the reference axis. In the stepped optical waveguide, the light is deflected to another plane. The step-like shape of the light guide or facilitates the installation in existing housing. In order to meet different installation conditions, it is also preferred that the light guide is curved in its extension along the reference axis.

A further embodiment provides that at least one of the light guides is curved in its horizontal extent along a horizontal axis transverse to the reference axis and in the intended use. As a result, a greater freedom is achieved for the design of the light exit surface.

It is also preferred that the light sources can be controlled separately from one another and / or emit light of different color and / or different intensity in order to realize different light or luminaire functions with the same common exit surface.

It is also preferable that at least one of the plurality of optical fibers have structures on which the light is directed in desired directions. The structures are, for example, interfaces of recesses in the optical waveguide, at which internal total reflections take place, and / or it is the narrow sides which delimit the optical waveguide. An internal total reflection of the incident light also takes place on these surfaces. The surfaces are shaped so that the reflected light is directed in desired directions. In an alternative or additional embodiment, the recesses form so-called air lenses. In these air lenses, the light propagating in the optical fiber passes through the recess in the optical fiber. When passing through the interface, the light is directed by refraction in desired directions. By means of these internal structures, for example, a light guide is provided which allows both a good focusing of the light in the direction of the reference axis, and also allows a certain illumination of edge areas.

A preferred embodiment provides, in addition to the light exit surfaces of the stacked light guide further light exit surfaces are arranged so that their light exit surfaces are arranged so that their light exit surfaces are the same height with respect to a transverse axis to the reference axis and the intended use vertical axis as at least one light exit surface of the stack arranged light guide. These adjacent light exit surfaces are, for example, the light exit surfaces of preferably plate-shaped light guides, which are arranged in the same horizontal plane as one of the stacked light guide.

Alternatively, it is also conceivable that one of the stacked optical fibers is further extended in the horizontal direction, as the example, immediately adjacent thereto arranged light guide. Areas of the first, upper light guide surface, which are not covered by the light guide arranged above, thereby have a height with respect to the y-axis, which is greater than the height of the second, lower light guide surface of the light guide arranged above. The light guide arranged above is embedded in the light guide arranged underneath. Lateral areas of the light exit surface of the surrounding, here the lower light guide, are designed so that they, viewed in the horizontal, are arranged next to the light exit surface of the embedded light guide.

In a similar embodiment, a light guide arranged below is embedded in the adjacent, above-arranged light guide, so that the light exit surface of the embedded light guide is surrounded above and laterally by the light exit surface of the above adjacent light guide.

Such designed and arranged light exit surfaces allow a flexibly shaped, common exit surface.

A further embodiment provides that at least one of the plurality of stacked optical fibers is fed with light from a plurality of light sources. Several light sources, whose light is coupled into the same light guide, increase the intensity of the light distribution generated by the light guide.

In addition, it is proposed that each light guide is fed with light from at least one light source. As a result, the entire exit surface, composed of the light exit surfaces of the individual plate-like light guides, efficiently illuminated homogeneously.

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 the various figures denote the same elements. It branches, each in schematic form:

1 a light guide according to the prior art in a perspective view;

2 a lighting device according to the invention in vertical section view;

3 a first embodiment of a plurality of stacked light guides in vertical section representation;

4 a second embodiment of stacked light guide in vertical section view;

5 a third embodiment of stacked light guides in vertical section;

6 a stack-like arrangement of a plurality of cranked executed optical fiber in vertical section representation;

7 a stack-like arrangement of a plurality of optical fibers and a diaphragm in vertical section;

8th a stack-like arrangement of a plurality of optical fibers and an imaging optics in horizontal section representation;

9 : a structure having optical fiber in horizontal section representation;

10 : a light guide, in the light of several light sources coupled, in vertical section view;

11 a further embodiment of a light guide, in the light of several light sources coupled, in vertical section view; and

12 a further embodiment of a light guide, in the light of several light sources coupled, in vertical section view.

1 shows a plate-shaped flat formed light guide 10 According to the state of the art. The light guide 10 is through a first light guide surface 12 , one of the first Lichtleitfläche opposite second Lichtleitfläche 14 and between a border 16 the first light guide surface 12 and a border 18 the second light guide surface 14 lying and the first light guide surface 12 with the second light guide surface 14 connecting narrow sides 20 limited. The dimensions of the first light guide surface 12 and the second light guide surface 14 in relation to the dimensions of the narrow sides 20 shape the appearance of the light guide 10 as a light guide plate.

A first area of the narrow sides 20 is as a light exit surface 22 educated. The light exit surface 22 is striped and elongated. A length of the light exit surface is large compared to its width (height). This means that the length (in the x direction) is at least five times the width (height) (in the y direction). A second area of the narrow sides 20 is as a reflector 26 educated.

Furthermore, the light guide 10 a reflection surface 24 on. The reflection surface 24 is as from outside to inside tapered recess in one of the two light guide surfaces 12 or 14 educated. In the in the 1 illustrated light guide 10 is the recess in the first light guide surface 12 between the light exit surface 22 and the reflector 26 arranged and extends to a certain depth in the light guide 10 into it. A light source 34 is disposed opposite to the tip of the recess on the second light guide surface such that light emanating therefrom is the reflection surface 24 illuminated and is reflected by this radially. From this radially reflected light on the reflector 26 incident light is there in the direction of the light exit surface 22 diverted. It is also preferable that the reflection surface 24 specially shaped so that from the light source 34 Outgoing light is reflected substantially radially to the side, but not evenly in all directions. Thus, it is possible, for example, certain areas of the reflector 26 and / or the light exit surface 22 strengthened lighting.

The light source 34 is outside the light guide 10 arranged at a small distance to this. The light source 34 is usually designed as a light emitting diode (LED) and on a support element 36 arranged so that their main emission direction is opposite to the y-axis direction of an imaginary coordinate system and points to the light guide surfaces. The z-axis of the coordinate system points in the main emission direction of the light guide 10 and thus, when the light guide is used as intended in a motor vehicle lighting device, in an apron of the motor vehicle.

Here, the z-axis is identical to a reference axis to be defined by the manufacturer of the illumination device. The reference axis serves as a reference direction for the rule-compliant light distribution. The reference axis passes through the intersection of the main axes (H = 0 °, V = 0 °) of the rule-compliant light distribution. In lighting devices that have an imaging optics, often the optical axis of this imaging optics is selected as the reference axis.

The longitudinal extent of the strip-shaped light exit surface is parallel to the x-axis of the coordinate system. In a proper installation of the light guide in a motor vehicle lighting device, the x-axis is parallel to the horizon and is therefore hereinafter also referred to as horizontal, the y-axis is to be understood as a vertical meaning. The imaginary coordinate system retains its alignment in all subsequent figures.

The 2 shows, inter alia, another embodiment of the light guide 10 , In contrast to that in the 1 illustrated light guide 10 , here is the reflection surface 24 a recess in the second light guide surface 14 , The light source 34 is opposite to the first light guide surface 12 arranged so that their main emission direction is parallel to the y-axis of the imaginary coordinate system. The terms "first light guide surface 12 "And" second light guide surface 14 "Are not with a position of the reflection surface 24 or the associated light source 34 but with the orientation of the light guide 10 in the room. In the direction of the y-axis follows the first light guide surface 12 the second light guide surface 14 , That is, the first light guide surface 12 also as upper light guide surface 12 and the second light guide surface 14 as lower light guide surface 14 can be designated.

The functioning of the light guide 10 is as follows: From the light source 34 outgoing light passes through the upper light guide surface 12 in the light guide 10 , Part of the incoming light hits the reflection surface 24 and is deflected at this radially so that the rays now predominantly at shallow angles, so almost parallel to the Lichtleitflächen 12 . 14 of the light guide 10 in the light guide 10 spread. Part of the incident light is in the direction of the light exit surface 22 , another part of the incoming light is in the direction of the reflector 26 diverted.

Unlike the 1 is the reflector 26 of the light guide 10 in the 2 for example, designed as a roof edge reflector. The roof edge reflector redirects the incident light twice. In particular, the reflector 26 formed so that during the reversal, a reversal of the light direction and that the further path of the deflected light, offset parallel to the path of the incident light, between the recess of the reflection surface 24 and the recess opposite the light guide surface 12 leads through. Thus, an effective homogeneous illumination of the light exit surface 22 achieved.

The first light guide surface 12 and the second light guide surface 14 transport the light by total internal reflection (TIR) in the direction of the light exit surface 22 ,

Both in the 1 illustrated embodiment of the light guide 10 as out of the in the 2 illustrated embodiment of the light guide 10 find use in a motor vehicle lighting device according to the invention. In the following with reference to 2 to 12 explained embodiments are predominantly based on the 1 and 2 described embodiments of the light guide 10 illustrated, without the invention being limited thereto. Also conceivable is the use of plate-shaped flat designed light guides, coupled into the light in other than the manner described.

2 shows a motor vehicle lighting device according to the invention 38 , In a housing 40 , whose light outlet opening with a transparent cover 42 are covered, are several, here three, light guide 10.1 to 10.3 stacked. The arrangement of the light guides 10.1 to 10.3 is such that a first light guide surface 12 one of the several light guides 10 adjacent to the second light guide surface 14 of the adjacent light guide 10 , At least in a transition area 44 near the light exit surfaces 22 adjacent light guides touch each other 10 ,

Each of the multiple light guides 10 is a light source 34 assigned whose main emission direction is opposite to the y-axis of the imaginary coordinate system.

It is preferred that the motor vehicle lighting device 38 has an imaging optics. The imaging optics is preferably an imaging lens 46 , The imaging optics is between the light exit surfaces 22 the light guide 10 and the cover 42 arranged. In one embodiment the imaging optics as imaging lens 46 this is preferably designed as aspherical, rotationally symmetrical lens, as it is known from conventional projection systems ago. Also conceivable is the use of a cylindrical lens, a toric lens, a Fresnel lens or a lens system of a plurality of individual lenses.

In the cylindrical lens, one or both refracting surfaces have the shape of a cylinder shell segment. Therefore, the cylindrical lens focuses on incident parallel light on a focal line instead of a focal point as is the case with the aspheric or rotationally symmetric lens.

The toric lens has two different powers, or more generally, two different deflection characteristics in two perpendicular directions. One of the lens surfaces has the shape of a surface portion of a torus.

In the illustrated embodiment, the imaging lens 46 executed as a separate part. In another embodiment, the imaging lens is part of the light guide 10 , This can be realized, for example, by correspondingly shaped light exit surfaces 22 ,

The embodiments and modes of operation of the illumination device shown and described below 38 are preferably realized with an imaging optics, but not on the presence of an imaging optics 46 limited.

The course of the beam paths within each of the multiple optical fibers 10 is essentially as above with reference to 1 or 2 has been described. Due to the stack-like arrangement of the light guides 10 lie their light exit surfaces 22 stacked one above the other, so that a plurality of strip-shaped and elongated light exit surfaces together an exit surface 48 form, which has a smaller ratio of length to width than the single strip-like light exit surface 22 ,

In order to have a homogeneous as possible exit surface 48 In order to achieve this, it is preferred that the beam paths in the individual light guides be achieved by suitable measures 10 not completely parallel to the first light guide surface 12 and to the second light guide surface 14 run, and thus a certain overlap of the beam paths of the individual optical fibers 10 in the transition areas 44 near the light exit surface 22 takes place.

The imaging optics 46 is set up by the individual light-emitting surfaces 22 formed common exit surface 48 in the apron of the lighting device 38 to image and thus to produce a rule for a light function of a motor vehicle light distribution in advance of the same. The imaging optics 46 forms the exit surface 48 upside down and reversed from. The imaging optics 46 are usually formed as lenses or lens systems, which are more or less afflicted with aberrations, which vary with increasing distance from the optical axis z of the imaging optics 46 strengthen. For these reasons arise for the arrangement of the light exit surfaces 22 to each other and in relation to the imaging optics 46 and depending on the lighting device 38 to be displayed light function various possibilities.

In the 3 to 6 Different possibilities are shown, light guides 10 to arrange in a pile. All versions have in common that the light guide 10 , whose light exit surface 22 has the largest luminance, in the direction of the y-axis as close as possible to the optical axis, here the z-axis, the imaging optics 46 is arranged. In this way, the requirement of rule-compliant light distribution that the brightness maxima are to be in the middle of the light distribution, the best possible.

For a light distribution which requires a good illumination or a brightness maximum below and above the horizontal main axis of the light distribution, such as a high beam distribution, an arrangement of the light guides is available 10 to 3 at.

The 3 shows an arrangement of the optical fibers 10.1 to 10.3 according to the 2 , In addition, another optical fiber 10.4 below the optical axis, here the z-axis, the imaging optics arranged. In the illustrated embodiment, the light guide 10.4 associated light source 34.4 on the second light guide surface 14.4 arranged. The recess of the first reflector 24.4 is on the opposite first light guide surface 12.4 arranged. The light source 34.4 thus radiates against the direction of the y-axis in the light guide 10.4 one. It is also possible to arrange the light source 34.4 on the first light guide surface 12.4 so that they face the Y-axis direction in the light guide 10.4 irradiates. The recess of the first reflector 24.4 is then opposite in the second light guide surface 14.4 to arrange.

The light exit surface 22.4 furthermore light guide 10.4 lies below the optical axis and is therefore of the imaging optics 46 imaged in the apron above the horizontal axis, so that through the further light guide 10.4 For example, a high beam distribution can be displayed.

The 4 shows a stacked arrangement of three light guides 10.1 to 10.3 , The first light guide 10.1 has a first light guide surface 12.1 and a second light guide surface 14.1 on, which are not parallel to each other, but here in the direction of the y-axis are inclined to each other and thus a uniform taper of the light guide 10.1 in the direction of the z-axis. By the taper of the light guide, the vertical extent of the light exit surface is reduced, whereby it is possible to produce a brightness maximum in a desired range of light distribution. The desired area is preferably the far zone of the light distribution. The light bundle transported by the total internal reflection at the inclined light guide surfaces thus experiences an expansion in the yz plane. The unwanted widening of the light beam causes a portion of the light emitted by the light exit surface 22 Exiting light from the imaging lens 46 is not directed into the light distribution.

Overall, in one embodiment of the lighting device 38 that have an imaging optics 46 has, a light guide 10 advantageous, the one or more light exit surface 22 has the smallest possible vertical extent. This applies in particular to optical fibers which are arranged as close as possible to the reference axis z. As the distance from the reference axis z increases, this vertical extent may increase.

Also conceivable is an extension of the light guide 10.1 in the direction of the z-axis. The first light guide surface 12.1 and the second light guide surface 14.1 are inclined away from each other in the y-axis direction. The light beam reflected on them by internal total reflections undergoes a reduction in its opening angle in the yz plane. There is therefore a reduction in the opening angle of the light source 10.1 outgoing light in the vertical direction.

The rejuvenation or reinforcement of the light guide plates 10 takes place as steadily as possible and the inclination angle of the light guide surfaces are small. Thus, a loss of the incident light due to unwanted leakage through the light guide surfaces is largely avoided.

Ideally, to avoid the optical effects of tapering or amplification of the optical fiber, each optical fiber should be made approximately constant in thickness over its entire extent. The thickness of one of the multiple light guides 10 is equal to or different from the thickness of another of the multiple optical fibers 10 , For example, it is preferable that the thickness of the plurality of stacked optical fibers 10 and thus the vertical extent of their respective light exit surface 22 increases with increasing distance in the vertical direction from the reference axis.

It is also conceivable that each of the light guides 10.1 to 10.3 has a steadily increasing or decreasing in the z-axis direction thickness.

The 5 shows three light guides 10.1 to 10.3 , which are stacked so arranged that the first light guide surface 12 one of the several light guides 10 adjacent to the second light guide surface 14 of the adjacent light guide 10 and only in a transition area 44 near the light exit surface 22 touch. The light exit surfaces 22 opposite light entry ends 50 the light guide plates 10 are more widely spaced. In this way creates a curved in the yz plane common exit surface 48 , On the one hand, these are the result of the individual light exit surfaces 22 emerging light beam aligned in their position to the overall light distribution, on the other hand one wins in the area of the light entry ends 50.i Let (i be an index numbering the optical fibers of the stack, for example from i = 1 to 3) of the individual optical fibers 10.1 to 10.3 against a purely horizontal orientation of the light guide 10 Space around, for example, heat sinks at the light sources 34 to arrange.

In the 6 is a stacked array of light guides 10.1 to 10.3 illustrated, wherein the first light guide surface 12 one of the several light guides 10 adjacent to the second light guide surface 14 of the adjacent light guide 10 and wherein these two light guide surfaces in one area 44 near the light exit surface 22 touch. Each of the multiple light guides 10 is executed angled. The light entry end 50 each light guide plate 10 to which the first reflector 24 and the first reflector 24 opposite, the light source 34 are arranged, is against the transition area 44 arranged bent at an angle α. In the illustrated embodiment, the angle α is equal to 90 °. The light source 34 here radiates against the z-axis direction in the associated light guide 10 wherein a main light exit direction through the light exit surface 22 is substantially in the z-axis direction. Since in the illustrated embodiment, the extension of the light guide 10 in the direction of the z-axis is small compared to other embodiments, this allows a particularly compact design of the lighting device 38 in this direction. In the 7 is a further embodiment of the stack-like arrangement of a plurality of optical fibers 10.1 to 10.4 shown. From the light guides 10.1 to 10.4 are only the transition areas 44 near the light exit surface 22 shown. The ends 50 the light guide 10 to which the first reflector 24 , the light source 34 and the second reflector 26 are arranged in the 4 not shown. The first light guide surface 12 one of the several light guides 10 is adjacent to the second light guide surface 14 of the adjacent light guide 10 arranged. Adjacent light guide plates 10 touch each other in the transition area 44 near the light exit surface 22 , In the contact surface, the optical fibers are preferably welded or glued together or in optical contact with each other through an optical oil distributed between them so that light can pass from one optical fiber to the other optical fiber. Each of the light guide plates 10 is at least one light source 34 arranged so assigned that the respective light guide plate is fed with light from this light source. The 7 shows various measures of the design in the field of light exit surfaces. These measures affect the homogeneity and / or the fine-tuning of the light distribution and are applicable to all embodiments of the illumination device 38 applicable.

The first light guide plate 10.1 is arranged on the z-axis so that the main emission direction through the light exit surface 22.1 in the direction of the z-axis. The further light guide 10.4 is along the y-axis below the first light guide plate 10.1 arranged so that the main emission through its light exit surface 22.4 is below the z-axis. The light exit surface 22.4 the further light guide 10.4 and the light exit surface 22.1 of the first light guide 10.1 lie in the same plane perpendicular to the z-axis. The light exit surface 22.2 of the second light guide 10.2 and the light exit surface 22.3 of the third light guide 10.3 are along the z-axis opposite the light exit surface 22.1 and the light exit surface 22.4 moved backwards. The light exit surface 22.3 and a part of the light exit surface 22.2 are tilted to the right against the z-axis direction.

Between the light exit surfaces 22 and in the 4 not shown imaging optics 46 is a blind 52 rotatably arranged about an axis. The aperture 52 is positioned so that an aperture edge 54 in the vicinity of the object-side focal surface of the imaging optics 46 is pivotable. This first end position of the aperture 52 is in the 4 represented by solid lines. The aperture edge 54 is imaged in the first end position as a light-dark boundary in the light distribution in the apron of the motor vehicle, so that it meets a rule-compliant low-beam function. A second end position 56 the aperture 51 where the bezel edge 54 is pivoted out of the main light exit direction and thus is not shown in the light distribution is in the 7 indicated by dashed lines.

In the illustrated embodiment, the individual light exit surfaces 22 the light guide 10 arranged at different distances .DELTA.z not equal to 0 of the object-side focal surface. As a result, the light exit surfaces 22 not in focus. It creates a homogeneous light distribution. Another embodiment provides that all light exit surfaces 22 are arranged at the same distance .DELTA.z from the object-side focal surface.

The light exit surface 22.3 of the third light guide 10.3 For example, from the vertical prism-like running in the drawing to the right inclined. This ensures that the light exit from this light exit surface 22.3 towards the optical axis z, as indicated by the arrow 58 shown. This is achieved on the one hand, that the position of one of the third light exit surface 10.3 emerging light beam in relation to the position of other light exit surfaces 22.2 . 22.1 , 22.4 Exiting light beam is changed within limits. Here it is through the light exit surface 10.3 emerging light directed in the direction of the reference axis z. On the other hand it is achieved that from the third light guide 10.3 escaping light with the light from the other 10.2 . 10.1 and 10.4 emerging light at least partially mixes and thus a homogeneous light distribution is generated.

By shifting a light exit surface by dz to the focal plane, the distribution of light, which emerges here, a little blurred. Due to the inclined regions of the exit surfaces, the position of the rays emerging there is changed vertically in the light distribution. In the case shown, the light is pushed a little closer to the center of the light distribution. These measures of changing dz or changing the inclination or the surface shape of the exit surfaces are also applicable in a different arrangement than shown here.

The basis of the 7 explained measures, ie different distances of the light exit surfaces 22 from the object-side focal surface or inclination or surface shape of the light exit surface 22 are also applicable in other arrangements and combinations than those shown here.

Other embodiments provide that the light exit surfaces 22 are shaped accordingly to guide and distribute the light passing through them accordingly. In particular, the light guides 10 Have scattering profiles or scattering structures, which on the light exit surface 22 or in a partial region of the light guide 10 near the light exit surface 22 are arranged.

The 8th shows the stacked optical fibers 10.1 and 10.2 the lighting device 38 in a view from below. Shown is in particular the first light guide surface 14.1 the plate-shaped flat formed first light guide 10.1 and the first light guide surface 14.2 the second optical fiber arranged above it in the viewing direction from below 10.2 , The first light guide 10.1 , in particular its reflector 26.1 , is designed so that the light source assigned to it 34.1 outgoing light to the optical axis z of the exit optics 46 is focused. The second light guide 10.2 or partly of the first optical fiber 10.1 concealed reflector 26.2 on the other hand is designed so that of the second light guide 10.2 associated light source, in the figure by the first light guide 10.1 is obscured, outgoing light in the drawing plane, here the xz plane, is parallelized. Accordingly, the light exit surface 22.1 of the first light guide 10.1 in comparison to the light exit surface 22.2 of the second light guide 10.2 a smaller longitudinal extent in the x direction.

In another preferred embodiment, the first light guide 10.1 almost in the second light guide 10.2 embedded. It is preferred that the light exit surfaces 22.2 of the second light guide 10.2 in the horizontal next to the light exit surface 22.1 of the first light guide 10.1 are arranged.

Also conceivable are embodiments of the illumination device 38 , in addition to the several stacked light guides 10 , which are arranged so that the first light guide surface 12 one of the several light guides 10 adjacent to the second light guide surface 14 of the adjacent light guide 10 and in a transition area 44 near the light exit surfaces 22 touch, even more plate-shaped light guide 10 which are arranged so that their first light guide surface 12 and / or second light guide surface 14 are at the same height with respect to the y-axis as one of the light guide surfaces 12 or 14 the stacked light guide 10 , It follows that the light exit surfaces 22 the further light guide in the x direction next to the light exit surface 22 one or more of the stacked optical fibers 10 are arranged.

The optical fibers used in the above-described embodiments for use 10 may have structures that in the light guide 10 channel propagating light. Such a light guide 10 is in the 9 shown. The first light guide surface 12 lies in the drawing plane. The light guide 10 has a centrally located, in the form of a recess 60 realized lens and individual deflection sections 62 . 64 . 66 . 68 . 70 . 72 on, which are realized in particular as inner reflection sections.

In the illustrated embodiment, the central recess has two refractive interfaces 61 so that the recess acts as a diverging lens which focuses the radially divergently incident light rays in the direction of the optical axis.

In another embodiment is central recess 60 set up with their breaking interfaces 61 to act like a condenser lens.

The deflection sections are partly by outer contours 62 . 64 the narrow sides 20 of the light guide 10 Are defined. The arrangement of the deflection sections is preferably symmetrical with respect to the optical axis z passing through the center of the light exit surface 22 and the second reflection surface 26 goes.

The inside of the light guide 10 lying deflection sections 66 . 68 . 70 and 72 are realized as boundary surfaces of recesses in the light guide material and positioned, shaped and oriented so that they capture as many partial light bundles. The detected partial light bundles are focused and aligned. The outer reflector 26 illuminates partly the inner deflection surfaces and otherwise provides for the illumination of the lateral edge regions of the light distribution, in which the intensity gradually decreases from the inside to the outside.

Overall, the different configuration of the structures in the form of lenticular-acting recesses or diversely designed deflection sections offers a variety of possibilities for directing the light propagating within the light guide in such a way that a desired, rule-compliant light distribution is displayed.

The 10 . 11 and 12 each show further embodiments of the light guide 10 , Everyone in the 10 to 12 shown plate-shaped flat light guide 10 has the first light guide surface 12 , the first light guide surface 12 opposite second light guide surface 14 , and between the edge 16 the first light guide surface 12 and the edge 18 the second light guide surface 14 and the first light guide surface 12 with the second light guide surface 14 connecting narrow sides 20 on. A first area of the narrow sides 20 is as a light exit surface 22 formed, and a second area of the narrow sides 20 is as a reflector 26 educated. The reflection surface 26 is formed as a recess in one of the two light guide, extending to a certain depth in the light guide 10 extends. The light source 34 is arranged so that its light over the recess opposite the light guide surface in the light guide 10 coupled and on the reflection surface 24 falls, with the reflection surface 24 configured to radially reflect incident light, and the reflector 26 is adapted to redirect light incident on him twice and reverse the direction of the light incident on him during the deflection, so that the further path of the deflected light between the reflection surface 24 and leads the light guide surface opposite him. The in the 10 to 12 illustrated light guide 10 are characterized by the fact that each light guide 10 at least two light sources 34 assigned.

The Indian 10 represented light guide 10 can be made by having two partial light guides, each having a connection surface, as shown in the 10 is shown as dashed line T. The partial light guides are connected together along their connecting surface. The connection is made for example by gluing, laminating or fusing. In the non-connected state, the connection surface is the light guide surface in the reflective surface 24 serving recess arranged.

Another embodiment of a light guide 10 which has multiple light sources 34 are assigned, the shows 11 , Here is the reflection surface 24 a recess in the first light guide surface 12 , On the side, the first light guide surface 12 opposite, the optical fiber has 10 one from the second light guide surface 14 outstanding coupling projection 74 on. The coupling projection 74 is through light entry surfaces 76 limited. The light entry surfaces 76 are aligned in the illustrated example substantially perpendicular to the Lichtleitfläche. The light entry surfaces 76 are preferably formed as a circumferential cylindrical surface. Along the peripheral cylindrical surfaces are the light sources 34 arranged.

On a side facing away from the light guide is the coupling projection 74 through a coupling-in reflection surface 78 limited. The Einkoppelreflexionsfläche 78 is in this respect the top surface of the coupling projection formed as a cylinder 74 , The Einkoppelreflexionsfläche 78 is formed so that through the respective light entry surface 76 incoming light by total internal reflection at the Einkoppelreflexionsfläche to the reflection surface 24 is deflected towards.

The 12 shows a light guide 10 , which starts from its light exit surface 22 extends like a plate. That of the light exit surface 22 opposite end 50 has two separate Lichtleitarme 80 on. The light guide arms 80 open together in the plate-like portion of the light guide 10 that is attached to the light exit surface 22 followed.

The reflector 26 is in this case on the multiple Lichtleitarme 80 divided up. Each of the light guide arms 80 has rear roof edge reflectors 82 put on the reflector together 26 form.

The light guide arms 80 are preferably each plate-like and extend from different y-axis directions towards the z-axis, in this case the center axis of the light guide 10 marked.

The reflection surface 24 is in the embodiment according to 12 not contiguous. Rather, the reflection surface 24 here in each case as a depression in those boundary surfaces of the Lichtleitarme 80 executed, which in the first Lichtleitfläche 12 or in the second light guide surface 14 pass.

Opposite these boundary surfaces, the Lichtleitarme 80 mutually facing intermediate surfaces 84 on. The intermediate surfaces 84 run in the direction of the light exit surface 22 towards each other and connect with each other. The light sources 34 are between the Lichtleitarmen 80 arranged. These are the light sources 34 arranged so that the light emanating from them through the interface 84 in the Lichtleitarm 80 coupled and arranged on the in the opposite boundary surface and as a reflection surface 24 serving depression meets.

It is conceivable that every Lichtleitarm 80 several light sources 34 having. The light sources 34 For example, they are arranged one behind the other in the x-axis direction and each of the light sources 34 is a depression in the boundary surface of the Lichtleitarms 80 assigned.

The in the basis of the 10 to 12 described embodiments of optical fibers 10 , each with several light sources 34 are assigned, suitable for the stack-like arrangement of a plurality of optical fibers 10 , which are arranged so that the first light guide surface 12 one of the several light guides 10 adjacent to the second light guide surface 14 of the adjacent light guide 10 , Wherein said light guide surfaces in a transition region 44 near the light exit surface 22 touch.

Claims (22)

Automotive lighting device ( 38 ), comprising at least one plate-shaped flat light guide ( 10 ), which has a first light guide surface ( 12 ), one of the first light guide surface ( 12 ) opposite second light guide surface ( 14 ), and between an edge ( 16 ) of the first light guide surface ( 12 ) and a border ( 18 ) of the second light guide surface ( 14 ) and the first light guide surface ( 12 ) with the second light guide surface ( 14 ) connecting narrow sides ( 20 ), wherein a first region of the narrow sides ( 20 ) as light exit surface ( 22 ) and a second area of the narrow sides as a reflector ( 26 ) is formed, wherein the reflector ( 26 ) is adapted to cover part of at least one light source ( 34 ) outgoing and into the light guide ( 10 ) coupled light in the direction the light exit surface ( 22 ), characterized in that the illumination device has imaging optics which are arranged and arranged to collect light emerging through the light exit surfaces and to direct them to the front of the illumination device such that the illumination device ( 38 ) several such optical fibers ( 10 ), which are arranged in a stack so that they lie one above the other when the illumination device is used as intended, and in that the light guide surfaces ( 12 . 14 ) of adjacent light guides ( 10 ) at least in a transitional area ( 44 ), which at the light exit surface ( 22 ) of at least one of the contacting optical fibers ( 10 ) and that of the plurality of optical fibers ( 10 ), whose light exit surface ( 22 ) near a lighting device ( 38 ) is arranged reference axis (z), which serves as a reference direction with H = 0 ° and V = 0 ° for the angles in approval relevant photometric measurements and when mounted on the vehicle, is adapted to concentrate the light coupled into it so that one of the lighting device ( 38 ) generated in advance of the lighting device ( 38 ), wherein the concentration takes place in that the reflector of the optical waveguide whose light exit surface is arranged close to the reference axis is adapted to emit light emanating from its associated light source in a horizontal plane to the optical axis when the illumination device is used as intended to focus on the imaging optics. Automotive lighting device ( 38 ) according to claim 1, characterized in that at least one of the plurality of optical fibers ( 10 ) a reflection surface ( 24 ), wherein the reflection surface ( 24 ) a recess in one of the two light guide surfaces ( 12 . 14 ), which extends to a certain depth in the light guide ( 10 ) and wherein the at least one light source ( 34 ) is arranged so that its light on the light guide surface opposite the recess ( 14 . 12 ) in the light guide ( 10 ) and on the reflection surface ( 24 ), wherein the reflection surface ( 24 ) is adapted to radially reflect incident light and the reflector ( 26 ) is adapted to light incident on it either directly to the light exit surface ( 22 ) or by another reflection on the reflector ( 26 ) to steer. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that the light exit surface ( 22 ) is arranged in the region of the object-side focal surface of the imaging optics. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that the light exit surface ( 22 ) at least one of the plurality of optical fibers ( 10 ) at a distance greater than zero from the object-side focal surface of the imaging lens ( 46 ) is arranged. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that at least one of them located in the transition region ( 44 ) contacting optical fiber ( 10 ) is set up to let light propagating in it emerge in such a way that it merges with that from an adjacent light guide ( 10 ) blurred light. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that at least one of the plurality of light guides ( 10 ) in partial areas of its light exit surface ( 22 ) or in the vicinity of its light exit surface ( 22 ) lying sub-areas structures which are suitable, in the light guide ( 10 ) to scatter propagating light. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that the light exit surface ( 22 ) at least one of the plurality of optical fibers ( 10 ) below the reference axis (z) of the illumination device ( 38 ) is arranged. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that between the light exit surfaces ( 22 ) and the imaging optics ( 46 ) a fixed or a movable aperture ( 52 ) is arranged. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that the light exit surface ( 22 ) at least one of the plurality of optical fibers ( 10 ) is arranged in the object-side focal surface of the imaging optics. Automotive lighting device ( 38 ) according to any one of the preceding claims, characterized in that the light exit surface of at least one of the plurality of optical fibers to the light exit surfaces of the other optical fibers along the optical axis offset or arranged obliquely or has a modified compared to the light exit surfaces of the other light guide shape. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that at least one of the plurality of optical fibers ( 10 ) the first light guide surface ( 12 ) and / or the second light guide surface ( 14 ) one Angle with the light exit surface ( 22 ), which is not a right angle. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that the first light guide surface ( 12 ) and the second light guide surface ( 14 ) of at least one of the light guides at least over a portion of their longitudinal extent at an angle to each other, which is greater than zero degrees and less than 10 degrees, so that the thickness of the plate-shaped light guide ( 10 ) changes uniformly towards its exit surface. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that the plurality of optical fibers ( 10 ) are arranged inclined to each other so that a distance between adjacent Lichtleitflächen starting from the transition region ( 44 ) towards the light entry end ( 50 ) is steadily increasing. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that a light entry end ( 50 ) at least one of the plurality of optical fibers ( 10 ) compared to the transitional area ( 44 ) near the light exit surface ( 22 ) is angled at an angle (α) with respect to the reference axis (z). Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that at least one of the plurality of light guides ( 10 ) is formed stepwise in the direction of the reference axis (z) such that the first light guide surface ( 12 ) and the second light guide surface ( 14 ) form together at least one stage. Motor vehicle lighting direction ( 38 ) according to one of the preceding claims, characterized in that at least one of the stacked optical waveguides ( 10 ) in its extension along the reference axis (z) is executed arched. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that at least one of the stacked optical fibers ( 10 ) is curved in its extension along a transversely to the reference axis and when used as intended horizontal axis. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that the light sources ( 34 ) are separately controllable and / or radiate light of different color and / or different intensity. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that at least one of the plurality of light guides ( 10 ) Structures ( 60 . 62 . 64 . 66 . 68 . 70 . 72 ) in the form of internal recesses, at which the light is directed in desired directions. Automotive lighting device ( 38 ) according to one of the preceding claims, characterized in that in addition to the light exit surfaces ( 22 ) of the stacked optical fibers ( 10 ) further optical fibers ( 10 ) are arranged so that their light exit surfaces ( 22 ) at the same height with respect to a transversely to the reference axis and in the intended use vertical axis are the same height as at least one light exit surface ( 22 ) of the stacked optical fibers ( 10 ). Motor vehicle lighting device according to one of the preceding claims, characterized in that at least one of the stacked optical fibers ( 10 ) with light from several light sources ( 34 ) is fed. Motor vehicle lighting device according to at least one of the preceding claims, characterized in that each optical fiber is supplied with light from at least one light source.

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