DE102011016392A1 - Roof lighting for vehicle, has coupling area for illuminating vehicle interior, where roof lighting is extended in vehicle over large part of surface of vehicle roof, and illumination unit is provided with light source for generating light - Google Patents

Abstract

The roof lighting (2) has a coupling area for illuminating a vehicle interior, where the roof lighting is extended in the vehicle over a large part of the surface of a vehicle roof (1). An illumination unit is provided with a light source (7) for generating the light and a light conductor (6a,6b,6c), in which the light is coupled. The light conductor is formed to decouple the light in the coupling area. The roof lighting has multiple segments (5a,5b,5c) which are illuminated from one another in a selective and independent manner. An independent claim is included for a method for processing the roof lighting in vehicle.

Description

The invention relates to a roof lighting for a vehicle.

In vehicles, a variety of different interior lighting is usually available. So it is now common to use next to a central lighting on the vehicle roof between the driver's seat and passenger seat and reading lamps for the rear rows of seats, floor lighting, glove box lighting etc. On the one hand, these interior lighting systems have functional functions, for example allowing reading in the vehicle in the dark; on the other hand, the interior lighting also fulfills important comfort functions. This makes it much more comfortable and safer for a driver to get into a vehicle when it is "invitingly lit".

The publication DE 101 23 263 A1 , which forms probably the closest prior art, relates to a lighting system in the interior trim of the vehicle roof, wherein the system comprises a light guide, which is designed as a flat optical waveguide and allows light from the light guide großflachig and homogeneously coupled into the interior of the vehicle. Thus, the lighting system serves as großflachige and glare-free brightening of the roof panel in the overhead area of the vehicle occupants.

The invention has for its object to propose a roof lighting, which allows improved illumination of the interior of the vehicle. This object is achieved by a roof lighting with the features of claim 1, by a method for providing the roof lighting in the vehicle with the features of claim 14 and a vehicle having the features of claim 15. Preferred or advantageous embodiments of the invention will become apparent from the dependent claims, the following description and the attached figures.

The invention thus relates to a roof lighting for a vehicle, wherein the vehicle is preferably designed as a motor vehicle, in particular as a passenger car. In other embodiments of the invention, the vehicle may also be designed as a truck, a bus, in particular a coach, or another mobile.

The roof lighting has at least one outcoupling area, which is designed for coupling out light for illuminating the vehicle interior. The illumination of the vehicle interior can be functionally brightened to z. B. to provide sufficient light for reading in the vehicle interior, or be illuminated to create specific artistic or decorative effects. The at least one decoupling region can extend over the visible side of the roof lighting in full-flattened manner; in modified embodiments, several decoupling regions can also be provided in the roof lighting.

The roof lighting is arranged in the vehicle above or in the overhead area of the vehicle occupants and extends flat in the region of the vehicle roof or forms the vehicle roof. The roof lighting extends over a majority of the surface of the vehicle roof, in particular, the roof lighting covers at least 50%, preferably at least 70% and in particular at least 80% of the surface of the vehicle roof. In particular, the roof lighting in the vehicle extends over at least 50%, preferably over at least 70% and in particular over at least 80% of the width of the vehicle roof and / or over at least 50%, preferably over at least 70% and in particular over at least 80% of the length of the vehicle roof vehicle roof. The width of the vehicle roof is preferably to be understood as the maximum distance between the upper edge of the side windows of the vehicle perpendicular to the vehicle's longitudinal direction. The length of the vehicle roof is preferably to be understood as meaning the maximum distance between the upper edges of the front and the rear window parallel to the vehicle longitudinal axis.

The roof lighting comprises at least one illumination device, which in turn has at least one or more light sources for generating the light and at least one light guide, in which the light of the light sources can be coupled in or coupled in. The optical waveguide is arranged and / or configured with respect to the light sources and the at least one outcoupling region in such a way that it transports the light from the light source into the at least one outcoupling region and decouples it there.

The light guide is designed to couple out the light in the coupling-out area. Preferably, the light is emitted homogeneously over the entire area of the coupling-out region. In particular, the light guide diffuses the light in the outcoupling region diffusely, with a uniform light intensity and / or not punctually in the interior.

The flat extension of the coupling-out region is particularly preferably perpendicular to the light propagation direction in the light guide from the illumination device to the coupling-out region and / or to the surface extension of the light-emitting device Roof lighting and / or the vehicle roof arranged.

It is proposed that the roof lighting has a plurality of segments which are selectively and / or independently illuminable and / or illuminated. In particular, the segments can be selectively and / or independently controlled with regard to the light color and / or the light intensity.

This new design of a roof lighting opens a variety of applications:
So it is z. B. possible that only the rear rows of seats associated segments are illuminated, while segments, which are assigned to the driver's seat, remain unlit, so as not to irritate the driver during the trip by stray light. It is also possible that only one segment is illuminated for a passenger seat, while all other segments remain unlit, on the one hand not irritate the driver by stray light and on the other not to illuminate the rear seats - for example, because of sleeping children.

Another field of application may be that the roof lighting is designed as a virtual sun roof or as a virtual night sky, wherein a brightness profile is simulated by a different illumination of the multiple segments.

A next embodiment may result in that the roof lighting is designed as an ambient light, wherein also by different illumination of the various segments, a light distribution is generated, which is perceived by the vehicle occupants as pleasant.

The roof lighting can be manually controlled or automatically controlled. An automatic control may be present, for example, if the roof lighting is designed as a welcome light, which is activated when unlocking the vehicle to illuminate the interior or sections thereof. A manual control can by an operating device, eg. B. a controller or other control device can be realized, which controls the different segments.

It is also possible for the segments, in particular with regard to the light color and / or the light intensity, to be activated such that an internal design of the vehicle trim is continued in the direction of the headliner. Thus, the roof lighting with multiple segments offers a variety of possible applications.

In terms of design, it is preferred if at least or exactly one illumination device is assigned to each segment. In particular, the segment is formed by the associated illumination device. Characterized in that each segment is assigned at least one lighting device, the segments can be particularly easy to control by the respective associated lighting device is activated, deactivated and / or adjusted depending on the desired light intensity and / or light color.

In a possible embodiment of the invention, the segments, preferably some or all of the segments, are transparent to one another. In particular, light may be transmitted from one optical fiber of one segment into the optical fiber of another, adjacent segment. The segments are thus to be understood as logical or virtual segments, wherein z. B. some or all segments of the ceiling lighting can be formed by a common light guide. It is advantageous in this embodiment that, in the case of logical segments, transitions from one segment to another segment can be implemented steplessly and are significantly defined by the control of the lighting devices or light sources.

In an alternative embodiment, the segments are separated from each other by light barriers. A light barrier between two segments causes in particular that light from one segment can not pass into the other segment. By this configuration, sharp transitions between the segments can be achieved. It may be advantageous, for example, if such a light barrier in the ceiling lighting between the driver's seat row and a rear, in particular subsequent row of seats is arranged to z. B. selectively activate only the roof lighting for the rear row of seats.

In a possible embodiment of the invention, the segments are partially transparent to each other and partially formed with light barriers.

In a possible embodiment of the invention, the segments are arranged in rows and / or rows in the vehicle. When arranged in rows, these are preferably aligned parallel to the driver's seat row or to the rear rows of seats. This embodiment has the advantage that, for example, selectively the roof lighting can only be activated in the area of the driver's seat row or only in the area of the rear row of seats. But even a division into rows may be advantageous, for example, the roof lighting can be activated only for a passenger seat, while a segment associated with the driver's seat remains disabled, not the driver to irritate. Particularly preferably, the segments are arranged so that each seat in the vehicle is assigned a separate segment either logically or physically.

In a possible embodiment of the roof lighting of the light guide is coated with decorative material and / or covered. In this embodiment, the decorative material is optionally transparent, so that the at least one coupling-out region is covered by the decorative material and illuminates the interior through it or the covering with decorative material is exposed in the region of the coupling-out regions in order to ensure trouble-free passage of light.

The optical waveguide material may be formed, for example, as a thermoplastic such as polymethyl methacrylate (PMMA) or polycarbonate (PC). These thermoplastics can be easily processed in an injection molding process or thermoformed. Since an intensity, a color and / or range of the coupled into the light guide light on a diameter or a ratio of the optical fiber dimensions (length, width, height) depends on each other and / or determined by this, has the preferred for the invention, optical fiber material, in particular as a sheet or after the primary molding, strong of preferably 0.1 to 20 mm, in particular from 1 to 15 mm.

Optionally, the light guide may be coated on one or more of its side surfaces to provide some effects in the emission of the light in / out of the extraction region (s). When coating, it may be z. B. may be a mirror layer. Optionally, a color coating and / or an effect coating may be provided to determine a light color and / or to color the light depending on its angle of incidence.

It is particularly preferred that the optical waveguide has a coupling-out structure introduced into the optical waveguide material. Alternatively or optionally complementing the light guide volume transducers, which are integrated in the optical fiber material. The light coupled into the optical waveguide is preferably refracted and / or deflected or scattered at the outcoupling structure and / or at the volume scatterers due to a different refractive index of the optical waveguide and the outcoupling structure and / or the volume scatterers. Preferably, the outcoupling structure and / or the volume spreaders are adapted to scatter the light in the light guide according to the Rayleigh and / or Mie theory. In this case, the light can be scattered in a 3-dimensional or isotropic manner. In particular, the outcoupling structure and / or the volume spreaders are designed to scatter the light so that it is coupled out flat in the outcoupling area.

In a possible variant of the invention, the volume spreaders are homogeneously dispersed in the optical waveguide material in order to produce a uniform flat illumination of the interior.

In a preferred embodiment of the invention, the volume scatterers integrated in the optical waveguide material are formed by nanoparticles having a mean preferably arithmetic diameter of less than 500 nm, preferably less than 300 nm, wherein in calculating the average arithmetic diameter a sum of all particle diameters is formed and this sum divided by the total number of particles. Among the suitable nanoparticles pay u. a. ceramic submicron or nanopowder. The diameter of the volume equivalent spherical diameter can be used, which indicates the diameter of a sphere with the same volume as the considered nanoparticles. Alternatively, a volume equivalent spherical diameter may be used, where the surface equivalent spherical diameter defines as the diameter of a sphere having the same surface area as the nanoparticle under investigation.

The volume scatterers integrated in the optical waveguide material can also be formed by air inclusions and / or pigments having an average arithmetic diameter of less than 3 mm, preferably less than 1 mm. The pigments are preferably made of high refractive ceramic solids, such as. As titanium (IV) oxide formed. Combinations of the nanoparticles, the pigments and / or the entrapped air are also conceivable within the scope of the invention as volume spreaders and optionally additionally as scattering centers.

In a preferred implementation of the invention, the coupling-out structure is formed by notches, roughenings and / or impressions, which in particular on one or more side surfaces of the light guide, for. B. at the bottom or top, are arranged.

As an option, one or more scattering centers may optionally be placed in the optical waveguide material in order to produce, in addition to the surface coupling or instead in the decoupling region, a generation of light beams for focusing the light onto a specific interior section. The scattering centers can be formed, for example, by further or the nanoparticles, air inclusions or pigments in the optical waveguide material. For constructive implementation of the scattering centers are also one or more selectively introduced coupling-out structures, in particular suitable prism or Lens structures on the interior facing the bottom of the light guide conceivable.

It is particularly preferred that the volume spreader and / or the outcoupling structure and optionally complementing the scattering centers are optically not detectable or only slightly visible to the user, whereby the light guide its transparent appearance or largely retain.

In a preferred embodiment of the invention, the injection molding process as a primary shaping is one of the preferred production methods of the optical waveguide, wherein the material used for the production is the optical waveguide material. This manufacturing method has the advantage that the light guide can be made accurately in a manufacturing step.

In addition to the original forms and a forming for the production of the light guide is possible. Since the optical fiber material is usually available as a sheet product, it can be made by thermal deformation in any shape and be converted to ceiling lighting or segments thereof.

It is particularly preferred that the volume spreader and / or the outcoupling structure and optionally additionally the scattering centers, are already introduced during a primary shaping of the light guide into this. In particular, the nanoparticles and / or pigments are added to the granules of the optical waveguide material and are processed during the injection molding of the optical waveguide or during the production of the board product. Alternatively, it is possible for the decoupling structure arranged on the side surface (s) to be introduced into the optical waveguide or the optical waveguide material after the primary shaping or forming.

The at least one coupling-out region is formed and arranged on the underside of the associated optical waveguide, whereby the light is emitted in the direction of the interior. Preferably, the coupling-out region extends over one or more partial regions or over the entire underside of the optical waveguide. The decoupling region is preferably formed at a location of the light guide, where it has an open space, which is formed in particular translucent or transparent. On the other hand, the upper side and / or the front side (s) of the optical waveguide are preferably preferably black-opaque or reflective coated, so that the light can not escape there. In this case, the coupling-out region is defined by the non-blackened and / or coated regions of the optical waveguide.

For example, a plurality of coupling-out areas are arranged next to one another or in pattern-like fashion on the / in the light guide. In one of these cases, the light guide is also partially blackened or reflective coated on the underside. An overall outcoupling area of the ceiling lighting formed by the spaced-apart or pattern-like outcoupling areas preferably has a area of at least 5000 cm ² , preferably of at least 10000 cm ² , and in particular of at least 15000 cm ² .

For example, the coupling-out region is arranged only in four corner regions of the light guide. Optionally, one or more successive outcoupling regions can be arranged in the center of the light guide or can extend around the light guide in the manner of a frame. In the context of the invention, the pattern-like arrangement of the coupling-out region comprises in particular a grid-like and / or net-like arrangement.

In addition to the partial blackening or reflective coating of the underside of the optical waveguide, the implementation of the spaced or patterned arrangement of the coupling-out regions is alternatively or additionally possible by a corresponding placement of the coupling-out structure or the volume scatterers in / on the optical waveguide material. For example, the volume spreaders or the scattering centers are integrated into the optical waveguide material in such a way that the light is spaced apart or emerges in a pattern in the outcoupling region.

A possible embodiment according to the invention provides that the at least one light source is concealed, for example arranged behind or laterally of the light guide. Preferably, the at least one light source is not visible to a user on or in the interior trim. For example, the at least one light source is arranged on one or more of the end faces of the light guide. It is also possible that the at least one light source is integrated in the light guide. In particular, it is introduced into the optical waveguide material, in particular injected.

In a possible inventive variant of the invention, the at least one light source is arranged at a distance from the coupling-out region. Preferably, in this variant, after the light has been coupled into the optical waveguide, the light first passes through a light feed section, for B. the opaque blackened or reflective coated area before it emerges in tranzluzenten or transparent Auskopplungsbereich to illuminate the interior.

In a particularly preferred embodiment of the invention, the light guide is transparent and / or water-clear. In this embodiment, it is particularly preferred if on the interior of the side facing away from the roof lighting an interior decor, for example, a picture, etc. is arranged. It is also z. B. possible that behind the roof lighting but visible through the roof lighting the vehicle design of the other interior is continued. This embodiment offers increased freedom of design for the interior design with deactivated ceiling lighting.

In this embodiment can also be provided that the ceiling lighting has a further lighting device which is arranged on the side facing away from the interior of the ceiling lighting and radiates through the ceiling lighting or the light guide therethrough.

In one embodiment according to the invention, the at least one light source is designed as a light-emitting diode (LED). LEDS can be used in different colors, for example RGB LEDs (red-green-blue LEDs) to produce different light colors in the light guide and thus in the outcoupling area. or organic light emitting diodes (OLED). In particular, it is provided that a power supply line to the one or more light sources hidden, in particular within the inner lining in the region of the vehicle roof and / or the light guide takes place.

• • Fertigung des Lichtleiters aus dem Lichtleitermaterial;
• • seitliche Anordnung der Lichtquellen am Lichtleiter zur Bildung der Beleuchtungseinrichtung;
• • Integration der Beleuchtungseinrichtung im Fahrzeugdach.

Another object of the invention comprises a method for providing the roof lighting in the vehicle, wherein the roof lighting is formed according to the previous description and / or one of claims 1 to 13. The method comprises the following steps:

• Production of the optical fiber from the optical fiber material;
• Lateral arrangement of the light sources on the light guide to form the illumination device;
• • Integration of the lighting device in the vehicle roof.

Another object relates to a vehicle with the roof lighting according to the previous description and / or one of claims 1 to 13.

Further features, advantages and effects of the invention will become apparent from the following description of preferred embodiments of the invention and the attached figures. Showing:

1 a schematic bottom view of the vehicle headliner of a vehicle with a roof lighting as a first embodiment of the invention;

2 a schematic diagram of the lighting devices of the roof lighting;

3 a schematic cross section, perpendicular to the vehicle longitudinal axis of the roof lighting in the 1 ,

The 1 shows a schematic bottom view of a vehicle roof 1 or a vehicle headliner of a vehicle with roof lighting 2 as an embodiment of the invention.

The vehicle is designed, for example, as a passenger car, the schematic view is from the vehicle interior in the direction of the vehicle roof 1 directed. The roof lighting 2 is flat and extends - relative to the entire vehicle - over more than 50% of the vehicle interior width or vehicle interior length. Looking at the embodiment in the 1 so takes the roof lighting 2 more than 80% or even more than 90% of the total area of the vehicle roof 1 to complete. The roof lighting 2 can be designed in particular as large as a panoramic roof.

When installed in the vehicle has the ceiling lighting 2 a bottom 3 on, which is directed flat in the interior of the vehicle. front sides 4a , b, c, d of the ceiling lighting 2 are equal to a vehicle's longitudinal axis ( 4c , d) or perpendicular thereto ( 4a , b) aligned and run adjacent to the side windows, the windscreen or the rear window.

The ceiling lighting 2 has three segments 5a , b, c, which are each between the end faces 4c , d extend perpendicular to the vehicle longitudinal axis. Every segment 5a , b, c has a flat or plate-like light guide 6a , b, c on, which are each on both sides with light sources 7 are coupled so that light from the light sources 7 in the light guides 6a , b, c is coupled.

For a description of the light guides 6a , b, c and the light sources 7 will be on the 2 referenced, which is a schematic perspective view of the light guide 6a from the 1 shows, the other light guides 6b , c are constructed analogously.

The light guide 6a is made of a fiber optic material 61 formed, which consists of polymethyl methacrylate (PMMA), a transparent photoconductive thermoplastic. The light guide material 61 has a strength of preferably 0.1 to 20 mm, in particular from 1 to 15 mm. One of the light sources 7 is on the front side 4c , another of the light sources 7 at the front 4d arranged and configured to generate light and this in the light guide 6a couple.

An optional reflective coating 8th at the in the 2 not visible, to Vehicle roof-facing top ensures that the coupled light is not out of the light guide 6a can escape. Rather, that is in the light guide 6a coupled light into the light guide 6a reflected back.

The light gets on the front sides 4c and 4d from the light sources 7 in the light guide 6a coupled. In a decoupling area 9 that extends over the entire bottom 3 of the light guide 6a and thus extends over a total area of more than 0.5 square meters, the light is extensively decoupled into the interior.

In the light guide 6a is a decoupling structure 10 introduced, which by roughening at the bottom 3 , z. B. in the form of a prismatic structure is formed. Complementary or alternative to the coupling-out structure 10 are in the light guide 6 volume scattering 11 integrated, which are formed by nanoparticles with an average arithmetic diameter of less than 500 nm, preferably less than 300 nm. Such nanoparticles are, for example, ceramic submicron and nanopowders, which are granules of the optical waveguide material 61 before the injection molding of the light guide 6 or in the semifinished product before forming.

In an alternative exemplary embodiment, the volume spreaders 11 by trapped air and / or pigments, eg. As titanium (IV) oxide, having an average arithmetic diameter of less than 3 mm, preferably less than 1 mm formed.

The outcoupling structure 10 and / or the volume spreaders 11 are designed to be in the light guide 6a deflected light to diffuse and according to the Rayleigh and / or Mie theory and / or the geometric optics to scatter it in the decoupling area 9 decoupling surface so that the interior of the vehicle are illuminated or illuminated areally.

In the light guide 6a are optionally complementary to the outcoupling structure 10 and / or the volume scatterers 11 scattering centers 12 integrated. These scattering centers 12 are due to an accumulation of nanoparticles and / or pigments in certain areas of the light guide 6a educated.

In an alternative embodiment, the scattering centers 12 through the outcoupling structure 10 formed, wherein the coupling-out structure 10 functionally, z. B. as a lens, in the optical fiber material 61 is introduced.

The scattering centers 12 are designed to, in addition to the surface radiation or instead, a directed radiation of the light from the coupling-out area 9 to create. Thus, certain areas of the interior can be specifically and / or focused illuminated in addition to the flat lighting.

The roof lighting 2 or the light guides 6a , b, c are either as a three-dimensional injection-molded part or as a forming part, prepared for. B. from a plate goods formed.

In the 1 it can be seen that the roof lighting 2 in this exemplary embodiment, six light sources 7 which has a common control unit 13 are controllable. Two light sources each 7 are a light guide 6a , b, or c or segment 5a , b, c assigned. The light guides 6a , b, c have volume spreaders 11 on, which gleichmaßig in the light guides 6a , b, c are distributed to allow a flat illumination or illumination of the interior. Optionally complementary and not shown may also be decoupling structures 10 or scattering centers 12 in the light guides 6a , b, c exist. Between the segments 5a , b, c are optionally perpendicular to the vehicle longitudinal axis extending separation areas 14 arranged. The separation areas 14 may be designed as light barriers, so that no light from a segment 5a , b, c can cross into the other segment. In another embodiment, the separation areas 14 however, light-transmitting or only light-damping, so that light can break.

The control unit 13 is programmtechnisch and / or circuit technology, the light sources 7 with respect to the light intensity and / or the light color selectively. For example, it is possible that only light sources 7 of the segment 5a while the light sources 7 the segments 5b, c remained deactivated. In this embodiment, only the rear part of the vehicle interior is then illuminated. Depending on the design of the separation areas 14 are between the segments 5a , b, c hard transitions or sliding transitions with regard to the light distribution and / or the light color possible. For example, it is possible in the segment 5a the light sources 7 fully activate in the segment 5d to activate the light sources with reduced power and in the segment 5c to completely deactivate the light sources in order to achieve a pleasant brightness and / or color transition from the rear area to the front area of the vehicle roof 1 to reach. It is also possible only the light sources 7 a front side 4c or 4d to activate and the light sources of the other front side 4d respectively. 4c to deactivate to illuminate only one side of the vehicle interior.

The 3 shows a schematic cross section through the vehicle roof 1 , wherein again the plate-like structure of the light guide 6a , b, c too recognize. The light sources 7 are hidden behind an interior panel 15 arranged of the vehicle and are therefore not visible from the interior.

Above the ceiling lighting 2 is the roof skin 16 shown the ceiling lighting 2 protects against weather conditions. In the space between the roof skin 16 and the light guides 6a , b, c may be arranged a decorative layer, which z. B. to the interior trim 15 is adjusted and through the transparent light guide 6a , b, c can be seen from the interior.

Alternatively, in the interspace 17 also other light devices 18 be arranged, which is a beam of light 19 through the light guides 6a , b, c can project into the interior and are designed for example as a reading light.

LIST OF REFERENCE NUMBERS

1

vehicle roof

2

roof lighting

3

bottom

4a,

b, c, d end faces

5a,

b, c segments

6a,

b, c light guide, lighting device

8th

coating

7

Light source, lighting device

9

output region

10

decoupling structure

11

volume scattering

12

scattering center

13

control unit

14

separating region

15

interior panelling

16

roof

17

gap

18

light Fixtures

19

light cone

61

Fiber-optic material

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10123263 A1 [0003]

Claims (15)

Roof lighting ( 2 ) for a vehicle, with at least one decoupling area ( 9 ) for lighting and / or illumination of the vehicle interior, whereby the roof lighting ( 2 ) in the vehicle over much of the surface of the vehicle roof ( 1 ), with at least one illumination device ( 6a , b, c; 7 ), wherein the illumination device ( 6a , b, c; 7 ) at least one light source ( 7 ) for generating light and at least one light guide ( 6a , b, c), in which the light can be coupled, wherein the light guide ( 6a , b, c) is adapted to receive the light in the at least one decoupling region ( 9 ) surface coupling, the roof lighting ( 2 ) several segments ( 5a , b, c) which are selectively and / or independently illuminable. Roof lighting ( 2 ) according to claim 1, characterized in that each segment ( 5a , b, c) at least one illumination device ( 6a , b, c; 7 ) assigned. Roof lighting ( 2 ) according to one of the preceding claims, characterized in that the segments ( 5a , b, c) are transparent to one another. Roof lighting ( 2 ) according to any one of the preceding claims, characterized in that the segments ( 5a , b, c) are separated from one another by light barriers. Roof lighting ( 2 ) according to one of the preceding claims, characterized in that the segments ( 5a , b, c) are assigned in rows and / or columns in the vehicle. Roof lighting ( 2 ) according to one of the preceding claims, wherein the light guide ( 6a , b, c) at least one into the optical waveguide material ( 61 ) introduced decoupling structure ( 10 ) and / or in the optical fiber material ( 61 ) integrated volume spreaders ( 11 ), which is / are adapted to diffuse the light, in the outcoupling region ( 9 ) uncouple flat. Roof lighting ( 2 ) according to claim 6, wherein in the optical fiber material ( 61 ) integrated volume spreader ( 11 ) is formed by nanoparticles, preferably with an average arithmetic diameter of less than 500 nm, preferably less than 300 nm. Roof lighting ( 2 ) according to claim 6 or 7, wherein in the optical fiber material ( 61 ) integrated volume spreader ( 11 ) is formed by air inclusions and / or pigments, preferably with an average arithmetic diameter of less than 3 mm, preferably less than 1 mm. Roof lighting ( 2 ) according to any one of claims 6 to 8, wherein in the optical fiber material ( 61 ) introduced decoupling structure ( 10 ) by notches, roughening and / or impressions on one or more faces ( 3 ; 4a ; 4b ; 4c ; 4d ) of the light guide ( 6a , b, c) is formed. Roof lighting ( 2 ) according to one of the preceding claims, wherein one or more scattering centers ( 12 ) in the light guide ( 6 ) are integrated and / or incorporated, in addition to the surface coupling of the light or instead to achieve a focusing of the light in the interior. Roof lighting ( 2 ) according to one of the preceding claims, wherein all the coupling-out regions together have a surface area of at least 5000 cm ² , preferably at least 10000 cm ² , in particular at least 15000 cm ² . Roof lighting ( 2 ) according to one of the preceding claims, wherein the light guide ( 6a , b, c) is transparent and / or water clear. Roof lighting ( 2 ) according to one of the preceding claims, characterized in that behind the light guide ( 6a , b, c) further light devices ( 18 ) are arranged, which by the light guide ( 6a , b, c) radiate through. Method for providing roof lighting ( 2 ) in the vehicle, the roof lighting ( 2 ) according to one of the preceding claims, and wherein the method comprises the following steps: production of the optical waveguide ( 6a , b, c) from the optical waveguide material ( 61 ); • lateral arrangement of the light sources ( 6a , b, c; 7 ) on the light guide ( 6 ) for forming the illumination device ( 6a , b, c; 7 ); • Integration of the illumination device ( 6a , b, c; 7 ) in the vehicle roof ( 1 ). Vehicle with roof lighting ( 2 ) according to any one of the preceding claims.

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