DE102013210257A1 - Attachment optics for a light source - Google Patents

Abstract

A front lens system (12) for a light source (22) of a motor vehicle lighting device is presented. The front lens has a light-coupling first side (14), a light-coupling second side (10) and a third side (16) lying in between. The second side has a central region (26) and at least one peripheral region (24), and the third side is set up to redirect coupled light to a peripheral region of the second side. The front optics are characterized by the fact that the central area (26) has a first partial area (26.1) and a second partial area (26.2), the at least one first partial area (26.1) coupling out light incident thereon and the second partial area (26.2 ) deflects light incident on it to the third side (16)

Description

The invention relates to a front optics for a light source of a motor vehicle lighting device according to the preamble of claim 1. Such a front optics is from the DE 10 2008 061 688 A1 known.

The known intent optical system has a transparent solid with a set up for coupling light of the light source first side, a set up for coupling of light second side and a lying between the first page and the second page third page, wherein the second side of a central area and at least one peripheral region and wherein the third side is adapted to redirect light coupled in via the first side to a peripheral region of the second side.

Automotive lighting devices are distinguished in headlights and signal lights. Headlamps have the task of illuminating the track of a motor vehicle so bright that the driver of the motor vehicle can detect obstacles in the roadway in good time. Signal lights fulfill the task of indicating to other road users the presence of a motor vehicle and / or the intentions of its driver.

Both types of lighting devices each produce light distributions that must meet certain requirements. Thus, it is necessary, for example, that certain minimum values of light intensities are achieved in certain areas in front of the illumination device intended for use in a vehicle, without other predetermined maximum values being exceeded in these areas or else in other areas.

An attachment optics in this context represents a component which collects light from the light source and which at least contributes to converting a light distribution initially generated by the light source only on the basis of its emission characteristic into a rule-conforming light distribution of the illumination device. In the beam path of the light emerging from the respective optical attachment additional optical elements such as lenses and / or lenses and / or light guides and / or concave reflectors can be arranged for this purpose, which bundle or scatter the light.

In motor vehicle lighting devices, semiconductor light sources, in particular light emitting diodes, are increasingly being used. Semiconductor light sources often have a light exit surface which is rectangular and has an edge length of between 0.3 mm and 2 mm. The semiconductor light sources often have a Lambert radiation characteristic, in which the light is first emitted in a nearly complete half-space.

Regulation-compliant light distributions of a signal light of a motor vehicle, on the other hand, are characterized by the fact that an angular range is illuminated, which is horizontal in the horizontal direction plus / minus 20 ° and in the vertical direction plus / minus 10 ° high. In order to achieve light intensities with semiconductor light sources which are sufficient for a rule conformity of the light distribution, a plurality of light sources must generally be used, with one light source or group of light sources interacting with one of their structurally assigned intent optics.

By a corresponding arrangement of a plurality of light sources and attachment optics, line-like or areal appearing light exit surfaces of motor vehicle illumination devices can be generated, which may be desirable for design reasons. The light exit surface of a single optical attachment is often round or rectangular. Rectangular attachment optics differ from one another in their aspect ratio, i. in the ratio of their width to their height.

The light exit surfaces of the attachment optics are generally larger by a multiple than the light exit surfaces of the LEDs. In the known intent optics, the energy density of the light exiting via the light exit surface of the attachment optics is not distributed uniformly over the light exit surface of the attachment optics. In a central region, which lies directly in the main emission direction of the light source, the energy density is greater than in less central, peripheral regions of the light exit surface. The light exit surface of the optical attachment is therefore not homogeneous bright, but there is a drop in brightness from the inside out. This disturbing inhomogeneity is the more pronounced, the greater the aspect ratio.

The impression of inhomogeneity also arises when several attachment optics are combined to form a linear or planar light exit surface. With such an arrangement, the less homogeneous the inhomogeneity, the fewer light sources per unit length or area unit are used.

Against this background, the object of the invention is to specify an intent optical system whose light exit surface appears to be more uniformly illuminated when the light source is switched on than is the case in the known intent optical system.

This object is achieved with the features of claim 1. The inventive Attachment optics is characterized in that the central region of the second side has at least a first subregion and at least a second subregion, wherein the at least one first subregion is adapted to couple light incident thereon from the first side over the second side and wherein the at least one second subarea is adapted to redirect light incident on it from the first side to the third side.

As a result of the fact that the central area has such a second partial area, light which would in the prior art be decoupled via the central area of the second side is not coupled out via the central area of the second side. This reduces the brightness of the central area. As a result of such a second subarea deflecting incident light from the first side towards the third side, this light can be deflected from the third side to the peripheral area of the second side. By this deflection, this light can be coupled via the peripheral area.

As a result, the brightness of the peripheral areas is increased at the expense of the brightness of the central area, which reduces the described inhomogeneity of the brightness of the light exit area as a whole.

The attachment optics according to the invention make it possible to produce larger, homogeneously luminous surfaces than known attachment optics. Consequently, a lighting device, which is composed of a plurality of adjacently arranged according to the invention attachment optics, comes with fewer light sources. This increases the efficiency of the lighting device.

In particular, for swept lighting devices, the shape of which follows a contour of the motor vehicle, the attachment optics according to the invention are advantageous. This is to be seen in comparison to front optics, which are arranged in a line transverse to the direction of travel. The transverse arrangement results in comparatively short arrangements. In a swept arrangement, the length of the light exit surface is generally greater if the projection of the light exit surface in the said transverse direction should have the same length as the transverse arrangement. Due to the greater length and inhomogeneities of the luminance can be more noticeable. This disturbing effect is reduced by the use of inventive attachment optics.

A preferred embodiment is characterized in that an aspect ratio of a width B to the height H of a light exit surface is between 3: 1 and 2: 1.

It is also preferable for the third side to be arranged with respect to the light emanating from the light source and incident on the third side via the first side such that the reflections of the light of the light source occurring thereon are total internal reflections.

It is further preferred that the attachment optics have a shape that increasingly widens starting from the first side and towards the second side.

It is also preferable that the third side is arranged with respect to the light incident from the light source to redirect this light to a peripheral area of the second side.

Furthermore, it is preferred that the first side has a light entry surface which is divided into a central region and at least one peripheral region.

It is also preferred that second subregions of the central region of the second side of the attachment optics are arranged so that they redirect incident light from the light entry surface to second subregions of the third side of the attachment optics.

It is also preferred that the second subregions of the third side of the attachment optics are farther outward than the first subregions of the third side of the attachment optics with respect to an optical axis of the attachment optics and, in particular, are not identical to the first subregions of the third side.

It is also preferred that the central region of the second side of the attachment optics is realized as an interface of a recess in the second side of the attachment optics.

A further preferred embodiment is characterized by projections protruding out of the interface of the recess, each of which has a first partial region serving for coupling out light in the form of part of the boundary surface of the projection.

It is also preferable that the remaining boundary surface of the protrusion is such that it does not exhibit any light-shading effect or reduces the interface used for decoupling.

Furthermore, it is preferred that the depression is so deep that none of the projections in the light exit direction projects beyond peripheral regions of the second side.

It is also preferred that the number n of the projections is between n = 2 and n = 10.

Furthermore, it is preferred that a region of the third side of the attachment optics, which redirects the light deflected outwards from the central subregion of the second side to the second side of the attachment optics parallel to the optical axis of the attachment optics, is designed step-shaped.

It is also preferable that the steps each consist of a reflection section which has the inclination to the incident light which is suitable for the desired deflection, and a section which is parallel to the light incident there.

Further advantages will be apparent from the dependent claims, the description and the attached figures.

It is understood that the features mentioned above and those yet to be explained can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. Show, in schematic form:

1 an outline of a set up for the coupling of light side of an optical attachment;

2 a section through the attachment optics from the 1 ;

3 a first embodiment of a features of the invention having attachment optics in a side view;

4 an embodiment in which peripheral areas of a light exit side of the attachment optics extend further outward than in the subject matter of 3 ; and

5 a front view of a motor vehicle lighting device.

In this case, the same reference symbols in different figures denote the same or at least functionally identical elements.

In detail, the shows 1 an outline of a set up for the coupling of light second page 10 a front optics 12 , The second page 10 has a width B and a height H. The aspect ratio of the width B to the height H is here about 2: 1, and the invention is not limited to this value. The aspect ratio is preferably between 3: 1 and 2: 1.

2 shows a section through the attachment optics 12 from the 1 , The intent optics 12 is a transparent solid. The transparent material of the optical attachment is eg polycarbonate (PC) or polymethyl methacrylate (PMMA). The attachment optics has a first page arranged for coupling in light 14 on. In the example shown this is a lower page.

The attachment optics has a second side set up to extract light 10 and a third side lying between the first side and the second side 16 on. The first side and the second side are separated from each other by the transparent material of the optical attachment between them, the first and second sides being from the light source 22 outgoing light 23 form refractive interfaces of the attachment optics.

At least a third page 16 the attachment optics surrounds the transparent material of the attachment optics lying between the first side and the second side and forms an interface reflecting light of the light source. With respect to the light emanating from the light source and incident on the third side via the first side, the third side is preferably arranged so that the reflections of the light of the light source occurring thereon are total internal reflections. This minimizes energy losses compared to reflections on a metallically mirrored interface, and reduces the unit cost of the optical attachment.

The light source 22 is preferably a semiconductor light source, in particular a light-emitting diode or a group of jointly controllable light-emitting diodes, which are mounted on a circuit carrier, which is mounted on a heat sink, that it absorbs heat emanating from the LEDs.

3 shows a first embodiment of a features of the invention having attachment optics in a side view. Again, that is the intent optics 12 is a transparent solid, which is a set up for coupling light first page 14 , a second page arranged for the extraction of light 10 and a third side lying between the first side and the second side 16 having. Also, the first page 14 and the second page 10 separated by the transparent material of the optical attachment between them and each form refractive interfaces for the light emitted by the light source of the optical attachment. The third pages 16 form interfaces where total internal reflections occur. Incidentally, this also applies to the subject matter of 4 ,

From the bottom side 14 protrude fastening projections 18 . 20 out, with which the attachment optics on a printed circuit board, not shown in the figure, they also prefer a light in the lower side 14 einkoppelnde light source 22 carries and holds, is attachable. The fastening preferably takes place such that the light source and the light entry surface have positions defined relative to one another. This is known and can be assumed here insofar. If in this application of light of the light source is mentioned, then always a arranged in the defined position light source should be meant.

As already mentioned, the first and second sides are for the light source 22 outgoing light-refracting interfaces of the attachment optics while the third sides surround the transparent material of the attachment optics lying between the first side and the second side and a light of the light source 22 form reflective interface.

The intent optics 12 has a shape that extends from the first page 14 starting and on the second page 10 increasingly expanding. This means that cross-sections through the attachment optics, which are located between the first side and the second side and bounded respectively by the third side, become larger in area as the distance from the first side increases and the distance from the second side decreases. As a desirable consequence, the aperture angle of light incident from the light source decreases as it reflects at the third interface. This is a direct consequence of the law of reflection and the geometry described and helps to convert the light emanating from the light source into a light distribution conforming to the rules.

The third page 16 is particularly in relation to that of the light source 22 incoming light 23 set up this light on a peripheral area 24 the second page 10 redirect. The deflection is preferably such that the deflected light 23.1 so steeply hits the peripheral areas of the second side that it is there broken and coupled out of the attachment optics. The peripheral areas 24 are preferably not curved.

The second page 10 the attachment optics points beside the peripheral areas 24 a central area 26 on. This central area is illuminated by light 27 the light source 22 illuminated, which is coupled via the first page in the intent optics. The central area 26 and the light source arranged in a defined position 22 are preferably arranged with respect to each other such that the central area lies in the main emission direction of the light source.

One in motor vehicle lighting devices as a light source 22 Frequently used light-emitting diode has approximately a flat light exit surface and has a Lambertian radiation characteristic. This means that the main emission direction of such a light source is parallel to the surface normal of its light exit surface. This also means that the energy density of the light emanating from the light source decreases with increasing angle deviation from the main emission direction.

The central area 26 the second page 10 the intent optics 12 Under these circumstances, it is first illuminated with more light or greater energy density than the peripheral areas 24 , which leads to the inhomogeneities described above. According to the invention, the central area 26 the second page 10 at least a first subarea 26.1 and a second subarea 26.2 on.

The first section 26.1 is set up on it from the first page 14 incoming light 25 the light source 22 on the second page 10 decouple. This effect is achieved by the fact that the first subarea 26.1 , which is part of the interface of the second page 10 the attachment optics is, in relation to that of the light source 22 incoming light 25 arranged so that the light 25 the light source hits there at a small angle to the surface normal. The angle is particularly so small that the light undergoes a refraction there and is decoupled from the transparent solid. The second part 26.2 on the other hand, it is set up on him from the first page 14 incoming light 27 the light source 22 to the third page 16 redirect. This light 27 is thus deflected in particular to the outside. The second sections 26.2 Preferably, they have the shape of a parabola branch, which directs the light, which seems to be incident from its focal point, to be directed parallel outwards. The light source is preferably arranged so that its light is aligned after entering the optical attachment and thus after the change of direction at the entrance surface by refraction, as if this light would come from said focal point.

It is understood that at the second subareas 26.2 in which the light exit surface of totally reflecting surfaces is interrupted, no light emission takes place. The size of the second partitions 26.2 is preferably in relation to the remaining light exit surface of the central region 26 chosen so that it comes in combination with a light source of suitable light intensity to physiological Überstrahlungseffekten that support a visually perceived homogeneity of the total area.

The first page 14 has a light entry surface which is in a central area 14.1 and at least one peripheral area 14.2 is divided. The peripheral area 14.2 the light entrance surface is so arranged that over him in the intentional optics 12 coupled light 23 on first sections 16.1 the third page 16 the intent optics falls. These surfaces 16.1 are in relation to each other, the light source 22 and the peripheral areas 24 the light exit surface 10 preferably arranged so that the over the peripheral areas 24 the light exit surface emerging light 23.1 parallel to the optical axis 28 the intent optics 12 is.

The central area 14.1 the light entry surface is arranged so that the over him in the intent optics 12 coupled light 27 the light source 22 on the central subarea 26 the second page 10 falls.

The second sections 26.2 of the central area 26 the second page 10 the intent optics 12 are preferably arranged so that they from the light entry surface 14 incoming light 27 on second subareas 16.2 redirect the third side of the attachment optics. In terms of an optical axis 28 the attachment optics are the second parts 16.2 the third page 16 the intent optics 12 farther out than the first sections 16.1 the third side of the attachment optics and are in particular not identical to the first sections of the third page.

The two parts 16.1 . 16.2 the third page 16 the attachment optics, the second subareas 26.1 . 26.2 the central area of the second page 10 the attachment optics and the central area 14.1 the light entry surface 14 and the light source 22 are preferably arranged with respect to one another such that the light propagating in the associated beam path and exiting via the peripheral areas of the second side 27 after exiting parallel to the optical axis 28 the attachment optics is aligned.

3 shows an embodiment in which this light on the outside and thus at a greater distance from the optical axis 28 the attachment optics from the attachment optics emerges as the light 23 that without reflection at the central area 26 the second page 10 on the peripheral areas 24 the second page 10 is steered.

In this embodiment, that is from the central area 26 the second page 10 outwardly redirected light 27 thus used to broaden the luminous light exit surface.

In an alternative embodiment, this could be from the central area 26 the second page 10 redirected to the outside 27 Light also on the same area of the second page 10 the intent optics are directed to the on the third page 16 the front optics diverted light 23 incident. In such an embodiment, instead of broadening the light exit surface, a brightening of the peripheral regions of the light exit surface is produced.

3 in particular shows a front optics, which transports the light of the light source in different beam paths. In a first beam path 25 becomes light 25 directly and thus without deflecting reflections over the central area 14.1 the light entry surface 14 coupled in and over first sections 26.1 of the central area 26 serving as a light exit surface second side 10 the attachment optics decoupled.

In a second beam path 23 becomes light 23 additionally once on the third page 16 the intent optics 12 diverted.

In a third beam path 27 experiences light 27 a first reflection on second partial areas 26.2 of the central area 26 the second page 10 and a second reflection on the third side 16 the attachment optics before it hits again on the second side of the attachment optics and there emerges from the attachment optics.

The intent optics is preferably designed so that in the three beam paths 25 . 23 . 27 propagating light is aligned in parallel after decoupling and has a spatially homogeneous light intensity. From such a light beam can easily produce a rule-compliant light distribution.

Alternatively, it is preferred that in the three beam paths 25 . 23 . 27 propagating light already has a rule-compliant light distribution after decoupling. The corresponding design of the attachment optics and their individual reflecting and refracting surfaces results in each case from the law of refraction and the law of reflection.

The central area 26 the second page 10 the intent optics 12 is preferred as the interface of a depression 30 in the second page 10 realized the intent optics. The first partial areas serving for light decoupling 26.1 of the central area 26 are preferred as interfaces of protrusions 32 realized in the light exit direction of the interface of the recess 30 protrude. The central subarea 26 has four projections in the illustrated embodiment 32 on. Every lead 32 preferably has exactly one serving for light extraction first portion 26.1 in the form of part of the interface of the projection. The remaining boundary surface of the projection is preferably such that it disturbs the function of the optical attachment as little as possible and in particular unfolds as possible no light shading effect or reduces the interface used for decoupling. For this purpose, the remaining interface with the optical axis of the optical attachment preferably forms an angle which is smaller than that Angle formed by the light entering the associated projection with said optical axis.

The presence of such an angle means that the optical axis of the optical attachment facing side surfaces of the projections are arranged tilted away from the base of the optical axis. This facilitates demolding during production by plastic injection molding. The second side of the projections, however, designed according to photometric requirements.

The projections extend in the direction perpendicular to the plane of the drawing preferably along a straight line. The straight lines and therefore also the projections are preferably parallel to one another. It is also preferable that the straight lines parallel to the height H in 1 run. In this case, the projections preferably extend in a first alternative over the entire height H. A cross section of the light-extracting surface 10 , that with it the partial surfaces 26.1 . 26.2 and 24 contains, is then over the entire height H of the page 10 constant. These cross sections can therefore be produced by extrusion, which facilitates manufacturability and facilitates polishability of the surfaces.

By contrast, the light entry surface is preferably adapted to the symmetry of the emission of the light source. The lateral light entry surface is preferably in particular as the light exit surface of the light source 22 revolving area designed. Thus, a uniform brightness distribution over the light exit surface is achieved in particular in luminaires, which has a plurality of attachment optics, which together have a coherent light exit surface.

The projections are preferably arranged to be outside a center of the page 10 are located so that is in the center of the page 10 one of projections free portion is located. In the embodiment shown, this subarea has a completely central subarea 26.3 with a Lichtauskoppelnden function and between this sub-area 26.3 and adjacent projections lying second portions 26.2 , The depression in the light exit surface 10 is preferably so deep that none of the projections protrudes in the light exit direction over the peripheral regions.

It is understood that the number n of the protrusions 32 can also be greater or smaller than n = 4. The value of n is preferably between n = 2 and n = 10. The larger n is, the finer is the central region 26 the second page 10 the optical attachment in light outward and thus from the direction of the optical axis 28 Dark appearing areas and light, for example, divided in the direction of the optical outcoupling and thus appear bright from this area areas.

When using the attachment optics as intended 12 in a motor vehicle light is the distance of a viewer from the light exit surface 10 typically larger than two to three meters. Then blur the bright and dark areas of the intent optics, which is generally not wider than 1 to 3 cm in total. As a desired consequence, the second side of the viewer then appears as a uniformly bright surface, which is also favored by the fact that the light sources are not punctiform, but have a certain extent. Preferably, LEDs are used with a rectangular, planar light exit surface with an edge length between 0.3 and 2 mm.

Because of that, the central area 26 as a depression 30 in the second page 10 is realized, this can be on the central area 26 incident light of the light source 22 without shading completely into outward-facing parts 27 and in shares 25 split, which are coupled out to the front, with the decoupling forward, for example, on the projections 32 he follows.

4 shows an embodiment in which the peripheral areas of the second side 10 the intent optics 12 continue to extend outward than the subject of the 3 , The second page 10 the intent optics 12 to 4 is thus wider than the second page 10 the intent optics 12 after 1 , The thus larger aspect ratio B / H of the subject 4 is helpful for achieving line-like, and over the length of the line homogeneous bright appearances of light exit surfaces.

The larger aspect ratio B / H is achieved by dividing the area 16.2 the third page 16 the intent optics 12 , that of the central subarea 26 the second page 10 outwardly redirected light 27 parallel to the optical axis 28 the attachment optics on the second side of the attachment optics 12 deflected, is designed step-shaped. The steps are each made up of a reflection section 16.3 , which is the appropriate for the desired deflection inclination to the incident light 27 owns and a section 16.4 together, as parallel as possible to the incident light there 27 so that it does not create a distracting or distracting effect in undesirable directions.

5 shows a front view of a motor vehicle lighting device 40 , The motor vehicle lighting device has a housing 42 on, the light exit opening through a transparent cover 44 is covered. In the housing several attachment optics are arranged with light sources in a line, the attachment optics have rectangular light exit surfaces, each with two narrow sides and two long sides. In the arrangement shown, a linear appearance results from the fact that in each case two attachment optics are arranged so that a narrow side of an attachment optics of a narrow side of the other attachment optics opposite and possibly even touched.

In a further embodiment, at least two of the described attachment optics are arranged one above the other in the direction of their height H. The superposition can also be made in a one-piece molded component. This can be achieved a flat illumination. The superimposition can also with the juxtaposition after 5 combined, so that the overall result is a matrix-like light exit surface composed of rows and columns. The attachment optics can also be arranged side by side with their broadsides. This applies to both a single-line and a multi-line arrangement. Different lines or even different columns fulfill different light functions in one embodiment. For example, a column or row provided with yellow LEDs provides a flashing light function, while a column or row provided with white light emitting LEDs performs a daytime running light function. In the tail lamp area, red LEDs can also be used accordingly to fulfill the brake light and / or taillight light functions. A section parallel to the plane of the drawing 2 lies and the light exit surface 10 of the 1 divides into two halves of equal size, is the same for all attachment optics equal or at least equal for each two superimposed attachment optics.

QUOTES INCLUDE IN THE DESCRIPTION

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Cited patent literature

• DE 102008061688 A1 [0001]

Claims (15)

Attachment optics ( 12 ) for a light source ( 22 ) of a motor vehicle lighting device ( 40 ), which attachment optics have a transparent solid body with a first side (FIG. 14 ), a second side adapted for the extraction of light ( 10 ) and a third side lying between the first side and the second side ( 16 ), the second side having a central area ( 26 ) and at least one peripheral area ( 24 ) and wherein the third side is arranged to deflect light coupled in via the first side to a peripheral region of the second side, characterized in that the central region ( 26 ) the second page ( 10 ) at least a first subregion ( 26.1 ) and at least a second subregion ( 26.2 ), wherein the at least one first subregion ( 26.1 ) is adapted to him from the first page ( 14 ) incident light over the second side ( 10 ) and wherein the at least one second subregion ( 26.2 ) is adapted to him from the first page ( 14 ) incoming light to the third side ( 16 ) to divert. Attachment optics ( 12 ) according to claim 1, characterized in that an aspect ratio of a width B to the height H of a light exit surface is between 3: 1 and 2: 1. Attachment optics ( 12 ) according to one of the preceding claims, characterized in that the third side is arranged with respect to the light emanating from the light source and on the first side to the third side incident light, that the reflections of the light of the light source occurring thereon are total internal reflections , Attachment optics ( 12 ) according to one of the preceding claims, characterized in that the attachment optics ( 12 ) has a shape extending from the first side ( 14 ) and on the second page ( 10 ) increasingly expanding. Attachment optics ( 12 ) according to one of the preceding claims, characterized in that the third side in relation to that of the light source ( 22 ) incident light is adapted to this light on a peripheral area 24 the second page 10 redirect. Attachment optics ( 12 ) according to one of the preceding claims, characterized in that the first page ( 14 ) has a light entry surface which is in a central area ( 14.1 ) and at least one peripheral area ( 14.2 ) is divided. Attachment optics ( 12 ) according to one of the preceding claims, characterized in that second subregions ( 26.2 ) of the central area ( 26 ) the second page ( 10 ) of the attachment optics ( 12 ) are arranged so that they from the light entry surface ( 14 ) incident light ( 27 ) to second subareas ( 16.2 ) redirect the third side of the attachment optics. Attachment optics ( 12 ) According to claim 7, characterized in that the second partial regions ( 16.2 ) of the third page ( 16 ) of the attachment optics ( 12 ) with respect to an optical axis ( 28 ) of the attachment optics are located further outward than the first subareas ( 16.1 ) of the third side of the attachment optics and in particular are not identical to the first subsections of the third page. Attachment optics ( 12 ) according to one of the preceding claims, characterized in that the central area ( 26 ) the second page ( 10 ) of the attachment optics ( 12 ) as the interface of a depression ( 30 ) in the second page ( 10 ) of the attachment optics is realized. Attachment optics ( 12 ) according to claim 9, characterized by projections protruding out of the interface of the recess ( 32 ), each of which serves a light-coupling first sub-area ( 26.1 ) in the form of part of the interface of the projection. Attachment optics ( 12 ) according to claim 10, characterized in that the rest of the surface of the projection is such that it does not exhibit a light shading effect or reduces the interface used for decoupling. Attachment optics ( 12 ) according to one of claims 9 to 11, characterized in that the recess is so deep that none of the projections in the light exit direction over peripheral areas ( 24 ) the second page ( 10 protrudes). Attachment optics ( 12 ) according to one of claims 9 to 12, characterized in that the number n of the projections 32 between n = 2 and n = 10. Attachment optics ( 12 ) according to any one of claims 10-13, characterized in that an area ( 16.2 ) of the third page ( 16 ) of the attachment optics ( 12 ), that of the central subarea ( 26 ) the second page ( 10 ) outwardly deflected light ( 27 ) parallel to the optical axis ( 28 ) of the attachment optics on the second side of the attachment optics ( 12 ) deflected, is designed step-shaped. Attachment optics ( 12 ) according to claim 14, characterized in that the steps each consist of a reflection section ( 16.3 ), which has the appropriate inclination for the desired deflection to the incident light ( 27 ), and a section 16.4 which is parallel to the incident light ( 27 ) lies.

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