Signal light module for a motor vehicle

Abstract

Signal light module (16) for a motor vehicle, which signal light module (16) has a light guide (18) with a light exit surface (20) that is elongated compared to its thickness (d) and a rear side (22) opposite the light exit surface (20) with deflecting elements (23), with a light source (24) and a coupling optic (26) that is arranged in a light beam emanating from the light source (24), characterized in that the coupling optic (26) has an optically effective surface (32) that is a lateral surface of a general cylinder, wherein the light source (24) is arranged on an axis (30) of the general cylinder and its main radiation direction leads perpendicularly away from the axis (30) and is directed towards the optically effective surface (32), wherein the optically effective surface (32) is designed such that it parallelizes light incident from the light source (24) in planes that are perpendicular to the cylinder axis (30), and in levels,which are parallel to the cylinder axis (30), not parallelized, and wherein the signal light module (16) has a homogenizer (34) which is arranged in the beam of the light emanating from the optically active surface (32) and is designed not to change a parallelism of propagation directions of the light in the planes perpendicular to the cylinder axis (30) and to homogenize a distribution of the propagation directions of the light in the planes parallel to the cylinder axis (30), wherein the light guide (18) is arranged relative to the homogenizer (34) such that it allows light incident from the homogenizer (34) onto the deflection elements (23) to exit via the light exit surface (20).

Description

The present invention relates to a signal light module according to the preamble of claim 1. such a signal light module is known from U.S. Pat. No. 7,111,970 B2 and has a light guide with a light exit surface that is elongated in comparison to its thickness and a rear side opposite the light exit side with deflection elements, as well as a light source and an input optics, which is arranged in a light bundle emanating from the light source. The coupling optics is here a concave depression in a narrow side of the light guide.DE 10 2014 102 496 A1 discloses a lighting device for vehicles having a planar light guide, comprising - two opposing flat sides for total reflection of light coupled into the planar light guide, - a light coupling surface for coupling in light at a light coupling side of the planar light guide, - a light coupling surface for coupling out light from the coupled-in light at a light coupling side of the planar light guide, wherein the light coupling surface forms a narrow side connecting the opposing flat sides, - a light source is assigned to each of the light coupling surfaces and the light coupling surface is formed uneven, wherein the light coupling surface has a central coupling section arranged in front of the light source in the main radiation direction and an outer coupling section adjacent thereto, wherein the central coupling-in section and the outer coupling-in section are shaped such that a first partial light beam of the light source impinging on the central coupling-in section impinges, under total reflection on the flat sides, on a central region of a partial surface of the light decoupling surface arranged in front of the light coupling-in surface in the main radiation direction, and that a second partial light beam of the light source impinging on the outer coupling-in section impinges on an outer region of the same partial surface adjacent to the central region.DE 10 2011 052 351 A1 discloses a light guide module consisting of a linear collimator made of optically transparent material, a toroidal lens made of optically transparent material and a light source, wherein the toroidal lens is arranged between the flat linear collimator, at the end of which scattering elements are located, and the light source, wherein the light emitting part of the light source is directed towards the entry surface of the toroidal lens and the exit surface of the toroidal lens is directed towards the entry surfaces of the linear collimator. The light source is preferably a light emitting diode and the toroidal lens is a Fresnel type lens.DE 10 2011 018 508 A1 discloses a light guide element arrangement for use in a light module of a motor vehicle lighting device. The light guide element arrangement comprises: a plate-shaped light guide element having a longitudinal extent and a transverse extent and having a light coupling surface for coupling in the emitted light, boundary surfaces having totally reflecting properties for reflecting the coupled-in light, a collimator element for concentrating the coupled-in light, a light exit surface through which light beams impinging at a specific angle are coupled out, and a light decoupling surface for deflecting the coupled-in light onto the light exit surface, and optically active means for beam shaping arranged in the beam path of the coupled-out light. A particularly efficient light guide element arrangement is proposed in which the collimator element focuses the coupled-in light more strongly when viewed in a meridional section than when viewed in a sagittal section, and in which the beam shaping means focuses the light passing through more strongly in the sagittal section than when viewed in the meridional section.DE 10 2013 100 557_A1 discloses an illumination device for vehicles having a planar light guide and a number of light sources emitting light beams arranged in a light coupling section of the planar light guide, wherein the planar light guide in the light coupling section has a light coupling surface for coupling in the light beam and a deflection surface for deflecting the coupled-in light beam in the direction of a main section of the light guide, which main section is adjoined in the light guiding direction by a light decoupling surface, in that the main section of the light guide extending between the light coupling section and the light decoupling surface has opposite flat sides, on which the coupled-in light beam can be totally reflected in the direction of the light decoupling surface, wherein the light coupling surface is configured in such a way that, the coupled-in light beam is passed on at a tilting angle to a main emission direction of the light source in the direction of the deflection surface.Signal light modules for motor vehicles are frequently arranged in lighting devices which have an outer contour which is at least partially arrow-shaped. This applies to some tail lamps, but in particular to many headlights. The light guides of the signal light modules then likewise frequently have an arrow shape following this outer contour. Light guides used hitherto are either round, rod-shaped and relatively efficient, but not planar (see, for example, DE 10 2007 023 076 A1) or they have a planar light exit surface with small coupling-out elements (like the subject matter of U.S. Pat. No. 7,111,970 B2). However, these articles are not very efficient. Here, an efficiency is understood to mean the proportion of the light of a light source which ultimately contributes to the generation of the desired signal light distribution. Examples of signal light distributions are brake light, tail light, turn signal light and daytime running light, without this enumeration being finally meant.The present invention differs from the prior art according to U.S. Pat. No. 7,111,970 by the characterizing features of claim 1, which provide that the coupling optics have an optically effective surface which is a lateral surface of a general cylinder, wherein the light source is arranged on an axis of the general cylinder and its main emission direction leads perpendicularly away from the axis and is directed onto the optically effective surface, wherein the optically effective surface is shaped such that light incident from the light source parallelizes in planes which are perpendicular to the cylinder axis and does not parallelize in planes which are parallel to the cylinder axis, and wherein the signal light module has a homogenizer which is arranged in the bundle of the light emitted from the optically effective surface and is configured to generate light which is incident from the light source and is incident from the light source, a parallelism of the propagation directions of the light in the planes perpendicular to the cylinder axis is not to be changed and a distribution of the propagation directions of the light in the planes parallel to the cylinder axis is to be homogenized, wherein the light guide is arranged relative to the homogenizer such that it allows light incident on the deflection elements from the homogenizer to emerge via the light outlet side.As a result of these features, the light of the light source is coupled out efficiently and homogeneously over the entire light exit surface, with the result that the light exit surface appears to a viewer to be uniformly brightly illuminated.A preferred embodiment is characterized in that the homogenizer consists of an air gap between the coupling optics and the light guide and a light mixer in the form of a plurality of scattering centers.It is also preferred that the scattering centers are arranged on the light exit surface of the coupling optics delimiting the air gap.A further preferred embodiment is characterized in that scattering centers are arranged in the light entry surface of the light guide bounding the air gap.It is also preferred that the scattering centers are cylinders.It is furthermore preferred that the coupling optics is a transparent solid body.A further preferred embodiment is characterized in that the optically active surface has a guide curve which has a convex lens profile in a central region, the focal line of which coincides with the cylinder axis.It is also preferred that the central region is bounded by side walls which protrude in the direction of the light source to such an extent that they encompass as far as possible the complete light emitted by the light source into a half space.It is furthermore preferred that the coupling optics in the main transport direction of the light in the coupling optics is so long that at least a part of the light experiences not only one but several total internal reflections on the front side and on the rear side of the coupling optics.A further preferred embodiment is characterized in that the coupling unit is a concave mirror reflector.It is also preferred that the coupling-in unit is a converging lens.Further advantages result from the following description, the drawings and the dependent claims. It is understood that the features mentioned above and those still to be explained below can be used not only in the respectively specified combination, but also in other combinations or alone, without departing from the scope of the present invention.Exemplary embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description.In this case, in each case in schematic form, show: FIG. 1 is a front view of a left headlight; FIG. 2 shows the signal light module from FIG. 1 in a plan view from above; FIG. 3 shows a side view of a light guide of the signal light module; FIG. 4 shows an enlarged illustration of the side view of the coupling-in optical unit from FIG. 3 ; FIG. 5 shows an enlarged illustration of the plan view of the coupling-in optical unit from FIG. 2 ; FIG. 6 shows an embodiment of a homogenizer; FIG. 7 shows a course of the brightness along a light exit surface of a light guide which does not have a homogenizer; FIG. 8 shows a course of the brightness along a light exit surface of a light guide for a signal light module according to the invention having a homogenizer; FIG. 9 shows an embodiment of a light guide; FIG. 10 shows a concave mirror reflector as an embodiment of a coupling unit according to the invention; and FIG. 11 shows a converging lens as an embodiment of a coupling-in unit according to the invention.In this case, identical reference symbols in different figures in each case denote identical elements or elements which are at least comparable in terms of their function. In detail, FIG. 1 shows a front view of a left front headlight 10 with a high beam module 12, a low beam module 14 and a signal light module 16, of which the light exit surface of a light guide 18 can be seen in FIG. 1. The x-direction is parallel to a longitudinal axis of the vehicle, while the y-direction is parallel to a transverse axis and thus parallel to the horizon and the z-direction is parallel to a vertical axis and thus parallel to a vertical. These directional information applies to all the figures of this application. In this exemplary embodiment, the light guide is arranged with its elongate flat light exit surface lying horizontally.FIG. 2 shows the signal light module from FIG. 1 in a plan view from above.The light guide of the signal light module has a light exit surface 20 which is elongate in comparison with its thickness d and a rear side 22 which is opposite the light exit side and has deflection elements 23. The deflecting elements are prisms here. The description as elongated is intended here to mean that the length of the light guide, which extends here in the x-y plane, is at least 10 times as great as its thickness d, which corresponds to the distance of the light exit surface from the rear side opposite it.The signal light module has a light source 24 and an input optics 26, which is arranged in a light beam emanating from the light source.The coupling optics is here a transparent solid body, which is a component separate from the light guide and which is arranged separated from the light guide by an air gap 28. At least one of the two boundary surfaces delimiting the air gap, of which one boundary surface is a light exit surface of the coupling optics and of which the other boundary surface is a light entry surface of the light guide, forms a homogenizer, which is explained in more detail below.FIG. 3 shows a side view of the light guide, wherein the observer looks at the light outlet side of the light guide transversely to the light outlet direction. A comparison of FIGS. 2 and 3 shows in particular that the coupling optics have a different contour in the plane parallel to the x-y plane according to FIG. 2 than in the plane parallel to the x-z plane according to FIG. 3.FIG. 4 shows an enlarged illustration of the side view of the coupling-in optical unit 26 from FIG. 3, and FIG. 5 shows an enlarged illustration of the plan view of the coupling-in optical unit 26 from FIG. 2.FIG. 5 shows in particular an imaginary axis 30 of a cylinder, to which a definition of an optically effective surface of the coupling optics 26 relates. The coupling optics have an optically effective surface 32 which is a lateral surface of a general cylinder.A general cylinder arises in that a plane curve is displaced by a specific distance along a straight line which is not contained in the plane of the curve. Each line parallel thereto can be considered as the axis of the cylinder. Two corresponding points of the original curve and of the shifted curve can be connected by one path. The entirety of these parallel paths forms the associated cylinder surface. A straight line lying on the cylinder is called a generatrix or surface line.FIG. 4 shows the original curve, also referred to as a guide curve.The light source is disposed on an axis 30 of the general cylinder, and the main direction of radiation of the light source 24 is perpendicular away from the axis 30 and is directed toward the optically effective surface. The optically effective surface 32 is shaped such that it parallelizes light incident from the light source in first planes which are perpendicular to the cylinder axis and not parallelizes light in second planes which are parallel to the cylinder axis. The first planes in the figures are the (vertical) x-z planes. FIG. 4 illustrates the parallel alignment of the light propagating in these planes. The second planes in the figures are the (horizontal) x-y planes. FIG. 5 illustrates the non-parallel orientation of the light propagating in these planes.For the efficiency of such a horizontally arranged light guide 18, it is important that the light beams in the first (vertical) planes run as far as possible in the same direction, i.e. parallel, and that they run in the second (horizontal) planes with a directional distribution that is as homogeneous as possible, in order to illuminate the deflection prisms 23 in the rear side 22 of the light guide 18 as uniformly as possible. For parallelizing the light in the first planes, the optically effective surface in these (vertical) x-z planes has the contour shown there as a guide curve. This is characterized in that it has a convex lens profile in a central region 32.z, the focal line of which preferably coincides with the cylinder axis. The light source is thus arranged on the focal line. The light entering the coupling optics from the light source 24 via the lens profile is therefore aligned parallel.In order to couple in as much light as possible from the light source, the central region is bounded by side walls 32.s which project so far in the direction of the light source that they encompass as much light as possible that is emitted by the light source into a half space. This light is therefore, unless it is already coupled into the coupling optics via the central lens profile, refracted into the coupling optics via the side surfaces. The side surfaces are shaped accordingly for this purpose. They have, in particular, a slope towards the incident light, at which the light is coupled in (and not, for example, reflected). This light subsequently impinges on an outer wall 32.a, which is shaped almost parabolically in the plane of FIG. 4 and which therefore also substantially parallelizes this light by total internal reflections.This contour shown in FIG. 4 is extruded in the horizontal, to a certain extent along a generating straight line. Extrusion is understood here to mean moving in space with which an object with n+1 dimensions is produced from an object with n dimensions during the design. A line is thus produced by extruding a dot. A surface is produced by extruding a line. A body is produced by extruding a surface.FIG. 5 shows the rectilinear boundary resulting from the extrusion of the contour shown in FIG. 4. Overall, this results in a coupling surface which has a cylindrical shape with the described guide curve visible in FIG. 4.Due to the rectilinear course of the generatrix 30, the light enters the coupling optics in a (horizontal) x-y plane, as is shown in FIG. 5, with a change in direction, which is determined by the different refractive indices of the air and of the material of the coupling optics. This results in a reduction of the aperture angle of the light beam, which is dependent in particular on the material of the coupling optics, when it enters the coupling optics. Further parallelization, as occurs in first (vertical) x-z planes by the shape of the guide curve, does not result in the second (horizontal) x-y planes.The coupling optics 26 is preferably so long in the main transport direction of the light in the coupling optics that at least a portion of the light experiences not only one but several total internal reflections on the front side 26.v and on the rear side 26.r of the coupling optics. This is a feature which distinguishes the launch optics of the invention from conventional catadioptric optical attachments. In conventional catadioptric optical attachments, a respective light beam generally experiences only a single total internal reflection on a lateral outer wall before it is coupled out via the front side of the catadioptric optical attachment. The front side 26.v and the rear side 26.r are preferably parallel to one another. As a result, the beam angle in the x-y planes (i.e., horizontal planes) does not change due to these multiple reflections.According to the invention, the signal light module 26 has a homogenizer which is arranged in the bundle of the light emanating from the optically active surface and is configured not to alter parallelism of the propagation directions of the light in the planes lying perpendicular to the cylinder axis 30 and to homogenize a distribution of the propagation directions of the light in the planes lying parallel to the cylinder axis, wherein the light guide 18 is arranged relative to the homogenizer such that light incident on the deflection elements from the homogenizer emerges via the light outlet side 20.Such a homogenizer 34 is shown in FIG. 6, which is an enlarged view of the subject matter of FIG. 5. The homogenizer here consists of an air gap 28 between the coupling optics 26 and the light guide 18 and a light mixer in the form of a plurality of scattering centers, which are arranged here on the light exit surface 35 of the coupling optics 26 delimiting the air gap 28. In one embodiment, scattering centers are alternatively or additionally arranged in the light entry surface 36 of the light guide 18 delimiting the air gap. The scattering centers are, for example, cylinders whose generatrix runs perpendicular to the plane of the drawing of FIG. 6.The light mixer diffuses the light incident thereon in the illustrated horizontal plane to the right (upward in FIG. 6 ) and to the left (downward in FIG. 6 ). For a fictitious observer viewing the light mixer, this has the effect that the observer no longer sees the discrete light source 24 through the coupling optics 26, but rather that he appears to him the entire light mixer surface as a homogeneously brightly illuminated surface.For the further propagation of the light which has undergone homogenization by the homogenizer of the distribution of its propagation directions in the second (horizontal) x-y planes, the advantage results that the deflection elements 23 of the light guide, on which the light is incident on its further path, are illuminated substantially more uniformly than would be the case without the homogenizer 34 according to the invention. A more uniform illumination is understood here to mean a uniformly bright illumination of different deflection elements, i.e. an illumination whose brightness changes only slightly when the one deflection element changes over to the other deflection element.This uniformity then also develops in a more uniform illumination of the light exit surface 20 of the light guide 18.FIG. 7 shows a course of the brightness along a light exit surface of a light guide, as is shown in FIG. 3, for the longitudinal section having deflection elements in the rear side. The associated signal light module, however, differs from the signal light module described up to this point (and only in that it does not have a homogenizer according to the invention. The brightness is plotted in an arbitrary scale over the length of the light guide. The axes intersect at the origin (0, 0). As is easily recognized, the height of a brightness maximum is significantly more than twice the height of an adjacent brightness minimum, which is perceived as disturbingly non-uniform by the observer.FIG. 8, on the other hand, shows a course of the brightness along a light exit surface of the light guide from FIG. 3 for the longitudinal section having deflection elements in the rear side for a signal light module according to the invention having a homogenizer. Here too, the brightness is plotted in an arbitrary scale over the length of the light guide. As can easily be seen, the height of a brightness maximum is significantly less than twice the height of an adjacent brightness minimum. This means that the appearance of the luminous light guide of the signal light module according to the invention appears substantially more uniform and thus more homogeneously luminous than is the case in the prior art.With the invention, it is possible to produce signal light modules with rod-shaped light guides which have a rectangular or, more generally, square cross section transversely to the main propagation direction of the light in the light guide and which have elongate coupling-out elements and a high efficiency. The deflection elements are oriented transversely to the thickness d of the light guide and extend substantially over the entire thickness of the light guide.Due to this extension length, such deflection elements are considered here as elongated deflection elements.However, it is also possible to realize planar light guides which are elongated in one direction from the basic cross section and have elongate decoupling prisms. Depending on the extrusion direction of the basic cross-sectional figure (basic cross-sectional area), the coupling optics and the decoupling deflection elements are rotated during the design of the signal light module such that the light propagates mainly in the HV direction after the decoupling. The HV direction is approximately the straight-ahead direction. The HV direction points from the vehicle to the HV point, which is defined as the intersection point of a horizontal H lying transversely in front of the vehicle and a vertical H intersecting the longitudinal axis of the vehicle, for example.In the light guide shown in FIG. 9, the shape was produced by notionally extruding the base surface in a direction obliquely towards the rear. In order to couple out the light in the desired direction, the coupling-in unit had to be rotated slightly in the process. FIG. 9 ashows a view from the right. FIG. 9 bshows a view from the front and FIG. 9 cshows a view obliquely from above. FIG. 9 thus also shows in particular an embodiment with an input optics set up for the input of light of a plurality of light sources (right side in FIG. 9 a), and with deflection elements which are arranged one above the other in a plurality of rows and which are thus no longer elongated deflection elements in the sense of the definition given further above.FIG. 10 shows a concave mirror reflector 26.R as a configuration of a coupling-in unit which can be used in the invention. The cross section shown here also represents the guide curve of a cylinder. The generatrix of the associated cylinder along which the guide curve is notionally extruded is here perpendicular to the plane of the drawing. The guide curve preferably has a parabolic shape. The light source is arranged at the focal point of the parabola, so that the light reflected at the reflector is parallelized in the planes perpendicular to the generatrix. In planes which are parallel to the generatrix, on the other hand, no parallelization takes place.FIG. 11 shows a converging lens 26.L as a configuration of a coupling-in unit 26 which can be used in the invention. The cross section shown here is bounded by two guide curves, of which one is extruded to the light entry surface and one is extruded to the light exit surface of the lens which is thus cylindrical overall during lens design. The generatrix of the associated cylinder along which the guide curves are notionally extruded is here also perpendicular to the plane of the drawing. The guide curves preferably together result in a refractive behavior, by means of which the light beam emanating from the light source with a large aperture angle, insofar as it propagates in the x-z planes, is parallelized. In planes which are parallel to the generatrix, on the other hand, no parallelization takes place.In a further embodiment, instead of elongated decoupling elements, the light guide has a plurality of rows of deflection elements, each of which extends along the main propagation direction of the light in the light guide and which are arranged next to one another transversely to this direction. In the arrangement shown, in which the main propagation direction lies in a horizontal plane, this side-by-side arrangement is an arrangement one above the other. See in particular FIG. 9a.A further embodiment is distinguished in that within a row of deflection elements too few or too individual deflection elements are missing in order to achieve specific illuminated patterns.Prisms can be used as deflection elements. It is always essential for the function as deflecting element that the light incident on the respective deflecting element is directed so steeply onto the light outlet side that it no longer experiences total internal reflection there, but rather is decoupled.A further embodiment provides that the deflection elements, in particular in the case of a realization by prisms, differ in height, width, depth and angular position with respect to the main propagation direction in order to achieve the desired homogeneity and light distribution of the coupled-out light. The extrusion direction with which the deflection elements are produced during the design by notionally extruding a base surface can additionally also be rotated horizontally and / or vertically in a plurality of directions. For the same reason, the light exit surface can also be curved.The invention can be realized not only with flat light guides whose base surface has been notionally extruded only in one direction during the design, but the invention can also be realized with light guides which are additionally slightly curved or also curved in the vertical direction.Up to this point, the invention has been explained with reference to a light guide extending in the horizontal direction. However, the invention is not limited to applications with this orientation. The light guide can also be arranged in a direction extending in the vertical direction. Of course, this is not because the light guide must also generate a control-compliant signal light distribution, whose arrangement and orientation in space do not change, even in an arrangement oriented differently in space.Then, the above-mentioned vertical and horizontal planes must be interchanged. Light guides arranged running at an angle are also possible. However, these are not as efficient as, in particular, horizontally arranged light guides.A horizontally arranged light guide can also be slightly curved out of the horizontal plane. However, it must be ensured that all deflecting elements are still illuminated by parallelizing the beams in the x-z planes.

Claims

Signal light module (16) for a motor vehicle, which signal light module (16) has a light guide (18) with a light exit surface (20) which is elongate in comparison with its thickness (d) and a rear side (22), opposite the light exit surface (20), with deflection elements (23), having a light source (24) and an incoupling optical unit (26) which is arranged in a light bundle emitted from the light source (24), characterized in that the incoupling optical unit (26) has an optically effective surface (32) which is a lateral surface of a general cylinder, wherein the light source (24) is arranged on an axis (30) of the general cylinder and its main emission direction leads perpendicularly away from the axis (30) and is directed onto the optically effective surface (32), wherein the optically effective surface (32) is designed such that it contains light incident from the light source (24) in planes, which lie perpendicular to the cylinder axis (30), parallelized and non-parallelized in planes which lie parallel to the cylinder axis (30), and wherein the signal light module (16) has a homogenizer (34) which is arranged in the bundle of the light emanating from the optically effective surface (32) and is configured not to alter parallelism of propagation directions of the light in the planes lying perpendicular to the cylinder axis (30) and to homogenize a distribution of the propagation directions of the light in the planes lying parallel to the cylinder axis (30), wherein the light guide (18) is arranged relative to the homogenizer (34) in such a way that it allows light incident on the deflection elements (23) from the homogenizer (34) to emerge via the light exit surface (20).Signal light module (16) according to one of the preceding claims, characterized in that the homogenizer (34) consists of an air gap (28) between the coupling optics (26) and the light guide (18) and a light mixer in the form of a plurality of scattering centers.Signal light module (16) according to Claim 2, characterized in that the scattering centres are arranged on the light exit surface (35) of the coupling-in optical unit (26) which delimits the air gap (28).Signal light module (16) according to Claim 2, characterized in that the scattering centres are arranged in the light entry surface (36) of the light guide (18) delimiting the air gap (28).Signal light module (16) according to Claim 2, characterized in that the scattering centres are cylinders.Signal light module (16) according to one of the preceding claims, characterized in that the coupling optics (26) is a transparent solid body.Signal light module (16) according to Claim 6, characterized in that the optically active surface (32) has a guide curve which, in a central region (32.z), has a convex lens profile whose focal line coincides with the cylinder axis (30).Signal light module (16) according to Claim 7, characterized in that the central region (32.z) is bounded by side walls (32.s) which project so far in the direction of the light source (24) that they encompass as far as possible the complete light emitted by the light source (24) into a half space.Signal light module (16) according to Claim 8, characterized in that the coupling optics (26) is so long in a main transport direction of the light in the coupling optics (26) that at least some of the light experiences not only one but a plurality of total internal reflections on a front side (26.v) and on a rear side (26.r) of the coupling optics (26).Signal light module (16) according to one of Claims 1 to 5, characterized in that the coupling-in optical unit (26) is a concave mirror reflector (26.R).Signal light module (16) according to one of Claims 1 to 5, characterized in that the coupling-in optical unit (26) is a converging lens (26.L).

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