DE102020207459A1 - Lighting device for a motor vehicle - Google Patents

Abstract

The invention relates to a lighting device (100) for a motor vehicle, having a first light guide (101) and at least one second light guide (102). Light beams (L1, L2) of at least one illuminant (104a, 104b) can be or are coupled into each light guide (101, 102) via at least one light coupling surface (101e, 102e) assigned to the light guide (101, 102). Coupled light beams (L1, L2) of the illuminant (104a, 104b) can each be coupled out again from the light guide (101, 102) via at least one light output surface (101a, 102a). The invention proposes that at least the first light guide ( 101) is flat, with light beams (L1) being or being coupled into the first light guide (101) at the edge and the light coupling surfaces (101e, 102e) assigned to the light guides (101, 102) facing the lighting means (104a, 104b) which are arranged on a common board (103) assigned to the light guides (101, 102). The light decoupling surfaces (101a, 102a) of the light guides (101, 102) point at least in sections in the same light emission direction (LA).

Description

The invention relates to a lighting device for a motor vehicle with the features of the preamble of claim 1.

Such a lighting device is for example from DE 10 2012 220 696 A1 known. Specifically, this document discloses a lighting device for generating moving light effects with a light guide with at least two lighting means which feed light into the light guide. The light from the lamps, which is coupled into the light guide, is mixed in the light guide in such a way that a color gradient can be seen in the light guide. The lighting means can be controlled in such a way that a dynamically changing color distribution results in the light guide. There can be an arrangement of linear and / or flat light guides.

The present invention is based on the object of providing a lighting device for a motor vehicle by means of which different light functions can be effectively implemented and which is designed to save space.

This present object is achieved by a lighting device with the features of patent claim 1. Advantageous designs or further developments of the invention can be found in the subclaims.

The invention is based on a lighting device for a motor vehicle with a first light guide and at least one second light guide. In each light guide, light beams of at least one luminous means can be coupled or are coupled into at least one light coupling surface assigned to the light guide via at least one light coupling surface assigned to the light guide. Coupled light beams of the illuminant can each be coupled out again from the light guide via at least one light coupling-out surface or are coupled out. This enables the lighting functions of a headlight or a rear light to be implemented. For example, light functions such as a tail light, a brake light, a direction indicator, a position light or even a daytime running light can be implemented.

The invention proposes that at least the first light guide is flat, with light rays being or being coupled into the first light guide at the edge. The light coupling surfaces assigned to the light guides face lighting means which are arranged on a common circuit board assigned to the light guides. In other words, the one circuit board carries all those lamps whose light is coupled into the light guide. The light outcoupling surfaces of the light guides point, at least in sections, in the same light emission direction. In other words, the light output surfaces of the light guides are aligned at least in sections in such a way that their imaginary surface normals point in the same light emission direction.

Such a lighting device creates the prerequisite that it can be constructed very compactly and that several light functions can be implemented with it in an effective manner. The lighting device can be designed, for example, as a rear light or as a headlight for a motor vehicle.

In the context of the invention, flat is intended to mean that a component has a surface extension which runs in two mutually perpendicular directions and which is several times greater in each direction than a thickness of the component.

According to a first development of the invention, the second light guide is also designed to be flat. One edge side of the light guide serves as its light coupling surface and another edge side of the light guide serves as its light output surface. In this way, a very high luminance can be achieved through the second light guide. In this way, the coupling-out surface is designed in the form of strips or lines. Furthermore, a very unusual appearance of the lighting device, in particular when the lighting means is activated, can be achieved through this design.

In an alternative development, it is also conceivable that the second light guide is rod-like, one end face of the light guide serving as its light coupling surface and another end face of the light guide serving as its light output coupling surface. The rod-like light guide can be straight, but also curved.

With this development, too, a very high luminance can be achieved through the second light guide, so that despite the flat first light guide, which is inefficient for some light functions, all conceivable light functions can be effectively implemented with the lighting device.

In another, advantageous embodiment of the inventive concept, the light coupling-out surface of the second light guide is located inside the light coupling-out surface of the first light guide, viewed in a plan view of the lighting device against its light emission direction. This contributes to a very memorable appearance of the lighting device.

It is also conceivable and leads to an unusual appearance if the light decoupling surface of the second light guide, viewed in a plan view of the lighting device opposite to its light emission direction, surrounds the light output surface of the first light guide at least in some areas at the edge. The light output surface of the first light guide can even be completely or at least predominantly surrounded by the light output surface of the second light guide, so that the light output surface of the second light guide surrounds the light output surface of the first light guide in a frame-like or almost frame-like manner.

In the embodiment described above, it is advantageous with regard to effective light extraction if the second light guide covers the first light guide on the rear side and overlaps the edge side. The second light guide, seen in the cross section of the light guide, has a rear deflecting bevel in the edge region.

In order to lower the manufacturing costs and contribute to the compactness of the lighting device, the light guides can be connected to one another in one piece (that is to say cohesively) in a further embodiment of the invention. If the light guides are made of plastic, they can be produced inexpensively in an injection molding process, for example.

According to another development, it is proposed that the light guides are arranged perpendicular to one another. In other words, the light guides are arranged at a right angle to one another, at least with their predominant longitudinal or surface extensions.

Alternatively, it is also conceivable that the light guides are arranged parallel to one another. That is to say, the light guides can be arranged parallel to one another with their longitudinal or surface extensions. As a result, part of the second light guide can be used as a light coupling area for the first light guide. In other words, the second light guide can thus form a light coupling surface for the first light guide.

In a further, expedient embodiment of the invention, it is proposed that the first light guide be aligned with its surface extension perpendicular to a surface extension of the board and the second light guide parallel to the surface extension of the board.

The second light guide has a deflecting bevel arranged in the area of its light coupling surface and the first light guide has a reflective coating applied to the rear of the latter.

Such a configuration ensures proper deflection of light beams coupled into the light coupling surfaces of the light guides to the light output surfaces of the light guides.

In an expedient development, it is also conceivable for the second light guide to be arranged behind the first light guide when viewed against a light emission direction of the lighting device, the light output surface of the second light guide being directed onto the first light guide.

This can contribute to a unique and brand-specific appearance of the lighting device in both day and night design. In the night design, i.e. when the lamps are switched on, the first light guide acts like a light curtain that covers the second light guide and through which the light from the first light guide shines. In the day design, however, the light decoupling surface of the second light guide can be used or act as an additional design element.

Optionally, the light decoupling surface of the second light guide can be provided with decoupling optics (for example cushion optics or roller optics). This is useful when the two light guides are not connected to one another in one piece. In this case, an air gap will expediently also be present between the coupling-out point of the second light guide and the rear side of the first light guide.

In the case of a one-piece design of the two light guides, in which the light output surface of the second light guide adjoins the first light guide without an air gap, it is conceivable that the area of the light output surface of the first light guide which is adjacent to the light output surface of the second light guide is provided with a corresponding output optics is provided.

The lighting device can provide an effective distribution of the light functions in that the light function of a tail light, position light or daytime running light can be implemented or is implemented through the first light guide and the light function of a brake light or turn signal is implemented through the second light guide.

Preferred exemplary embodiments of the invention are shown in the figures and are explained in more detail in the following description with reference to the figures. This also makes further advantages of the invention clear. The same reference symbols, even in different figures, relate to the same, comparable or functionally identical components. Corresponding or comparable properties and advantages are achieved, even if a repeated description or reference is not made. The figures are not, or at least not always, to scale. In some figures, proportions or distances can be exaggerated in order to be able to emphasize features of an exemplary embodiment more clearly.

• 1 eine Schnittdarstellung der Beleuchtungsvorrichtung, in einer ersten Ausführungsform,
• 2 eine Ansicht der Beleuchtungsvorrichtung gemäß Ansicht II aus 1,
• 3 eine Schnittdarstellung der Beleuchtungsvorrichtung, in einer zweiten Ausführungsform,
• 4 eine Ansicht der Beleuchtungsvorrichtung gemäß Ansicht IV aus 3,
• 5 eine Schnittdarstellung der Beleuchtungsvorrichtung, in noch einer weiteren Ausführungsform,
• 6 eine Ansicht der Beleuchtungsvorrichtung gemäß Ansicht VI aus 5,
• 7 eine Ansicht der Beleuchtungsvorrichtung vergleichbar mit der Ansicht aus 6, jedoch in einer weiteren Ausführungsform,
• 8 eine Schnittansicht der Beleuchtungsvorrichtung, in noch einer weiteren Ausführungsform und
• 9 eine Ansicht der Beleuchtungsvorrichtung gemäß Ansicht IX aus 8.

It show each schematically

• 1 a sectional view of the lighting device, in a first embodiment,
• 2 a view of the lighting device according to view II from 1 ,
• 3 a sectional view of the lighting device, in a second embodiment,
• 4th a view of the lighting device according to view IV from 3 ,
• 5 a sectional view of the lighting device, in yet another embodiment,
• 6th a view of the lighting device according to view VI from 5 ,
• 7th a view of the lighting device comparable to the view from 6th , but in a further embodiment,
• 8th a sectional view of the lighting device, in yet another embodiment and
• 9 a view of the lighting device according to view IX 8th .

First of all, the 1 and 2 Referenced. There is a lighting fixture inside 100 can be seen which a first light guide 101 and a second light guide 102 having. The first light guide 101 is flat.

Flat in the context of the invention is intended to mean that the first light guide 101 a surface extension running in two mutually perpendicular directions F1 which is several times greater than a thickness in each direction d1 of the light guide 101 .

The second light guide 102 is also flat, with a surface extension F2 and a thickness d2 .

As can be seen, the two light guides are 101 , 102 with their area extensions F1 , F2 arranged at right angles to each other.

The light guides 101 , 102 are connected to one another in one piece (firmly bonded) using a two-component injection molding process. The first light guide is concrete 101 made of a plastic which has a degree of transmission (a light permeability) in a range from about 85 percent to almost about 100 percent. The degree of transmission is particularly preferably approximately 92 percent.

The only slight scattering property of the first light guide 101 is caused by light-scattering imperfections 101g caused that distributed in the light guide 101 are arranged. The light-scattering imperfections 101g can enter the light guide as interfering particles during manufacture 101 have been introduced. Alternatively, it is also conceivable to use the light-scattering imperfections 101g via laser processing into the light guide 101 bring in. The first light guide 101 can be colored, preferably colored red. It can consist of PMMA (polymethyl methacrylate) or PC (polycarbonate), for example.

The second light guide 102 on the other hand is made of transparent, uncolored or also made of transparent, colored plastic. Also the second light guide 102 can be made of PMMA or PC.

Below that from the light guides 101 and 102 existing two-component part is a circuit board 103 arranged which bulbs 104a and 104b carries and an area extension F3 having. The bulbs 104a and 104b are preferably designed as light emitting diodes.

There are several illuminants in each case 104a the second light guide 102 and several light sources 104b the first light guide 101 assigned. In other words, they become rays of light L2 the illuminant 104a via a light coupling surface 102e into the second light guide 102 coupled in via a deflection slope 102f deflected and is finally over a light decoupling surface 102a of the second light guide 102 in the direction of a light emission direction LA the lighting device 100 decoupled.

Rays of light L1 the illuminant 104b however, are via a light coupling surface 101e in the first light guide 101 perpendicular to the extension of the surface F2 of the second light guide 102 coupled in, in the light guide 101 about the light-scattering imperfections 101g scattered and arrive in this way or after an additional reflection on a rear, reflective coating 101f of the light guide 101 to a light decoupling surface 101a .

The light coupling surfaces 101e and 102e can additionally be provided with an anti-reflective coating, that is to say with a coating that prevents or at least reduces reflection of the light rays in the area of the light entry (not shown). This can increase the efficiency of the light coupling.

In the shown mounting position of the lighting device 100 is the board 103 , which the light guides 101 , 102 is assigned jointly, with their areal extent F3 horizontally aligned. Here is the second light guide 102 with its areal extension F2 parallel to the extension of the surface F3 the common board 103 aligned. The first light guide 101 is with its area extension F1 at a right angle to the extent of the area F3 the common board 103 aligned.

All components mentioned are in a common housing 106 housed. In the direction of the light emission LA is a light exit opening of the housing 106 closed by a lens. The lighting device 100 can be designed as a rear light or as a headlight for a motor vehicle.

It should also be mentioned that the first light guide 101 in its edge area by a frame-like panel 105 in the direction of the light emission LA is covered. The light decoupling surfaces 101a , 102a point in the same direction of light emission LA or at least in sections in the same light emission direction LA . In other words, the light decoupling surfaces 101a , 102a the light guide 101 , 102 Aligned at least in sections in such a way that their imaginary surface normals point in the same light emission direction LA point.

From the 2 it becomes clear that the light guide 101 and 102 the same or at least approximately the same width b exhibit. The case 106 is no longer shown here for the sake of clarity.

It can be seen from this figure that, due to the flat design, the second light guide as well 102 its light output surface 102a Is formed in strips or lines.
For example, it is conceivable that the lighting means 104b in cooperation with the first light guide 101 the light function of a tail light is realized. Through the bulbs 104a in cooperation with the second light guide 102 the light function of a brake light or a direction indicator can be implemented.

The lamps 104a and 104b appropriately selected in the type of light they emit. It is also conceivable that the illuminants 104a , 104b as so-called RGB light-emitting diodes. These are able to emit light in any color.

In a departure from the exemplary embodiment, it is also conceivable to use the second light guide 102 not flat, but rod-shaped. In an exemplary use of several rod-shaped light guides 102 , which each have, for example, a square light output surface 102a ' can then be as in the 2 result shown appearance (indicated by dashed lines).

Finally, an aperture should be added 108 mentioned in which the second light guide 102 with its light output surface 102a is introduced.

The bulbs 104a , 104b are each arranged in a row perpendicular to the plane of the drawing, preferably along the entire or almost along the entire width b .

In a departure from the exemplary embodiment, it is also conceivable that the light guides 101 and 102 are only made of one component. For example, it is conceivable that both light guides 101 and 102 made of transparent plastic (e.g. PMMA) or made of a slightly light-scattering plastic with the light-scattering imperfections 101g (as described) are formed.

• Auch hierbei sind ein erster, flächiger Lichtleiter 201 und ein zweiter, flächiger Lichtleiter 202 vorhanden, welche eine gemeinsame beziehungsweise gemeinsam genutzte Platine 203 aufweisen. Die Lichtleiter 201, 202 und die Platine 203 weisen Flächenerstreckungen F1, F2 und F3 auf.

Based on 3 and 4th is now a further embodiment of a lighting device 200 explained:

• Here, too, are a first, flat light guide 201 and a second, flat light guide 202 present, which have a common or shared board 203 exhibit. The light guides 201 , 202 and the board 203 show surface extensions F1 , F2 and F3 on.

The circuit board is in the mounting position shown 203 with their areal extension F3 turn horizontally while the two light guides 201 , 202 with their area extensions F1 , F2 aligned parallel and perpendicular to the board 203 stand. Both light guides 201 and 202 are, in turn, flat in the sense of the invention.

Furthermore, the light guides are 201 , 202 not connected in one piece, but separated from each other on the board 203 about lamps 104a and 104b positioned. Both light guides 201 and 202 are made of different materials. Here is the light guide 201 again preferably made of a slightly light-scattering, colored plastic with light-scattering imperfections 201g . The transmittance of the first light guide 201 is in turn preferably in a range from about 85 percent to almost about 100 percent, particularly preferably about 92 percent.

The second light guide 202 is opposite to a direction of light emission LA the lighting device 200 seen behind the first light guide 201 arranged.

The light guide 201 becomes in the direction of the light emission direction LA again from a frame-like cover 205 covered so that only part of the light guide is left 201 a light decoupling surface 201a can provide.

Light rays (not shown) from the illuminants, which are again arranged in rows perpendicular to the plane of the drawing 104b are via a light coupling surface 201e of the first light guide 201 coupled in and via the light output surface 201a decoupled. After scattering at the light scattering imperfections 201g and / or after reflection on a rear reflective coating 201f the light rays reach the light decoupling surface 201a .

The bulbs 104a , which are also in rows perpendicular to the plane of the drawing below a light coupling surface 202e of the second light guide 202 are arranged, reach the light coupling surface 202e into the light guide 202 and are after deflection at a deflection slope 202f by about 90 degrees to a light decoupling surface 202a directed.

The light decoupling surface 202a points due to the planar design of the light guide 202 also have a strip-like or line-like outline (compare 4th ).

The light decoupling surface 202a of the second light guide 202 is opposite to the direction of light emission LA on the lighting device 200 seen on the back of the first light guide 201 directed and has a clear distance (i.e. an air gap) to this.

Optionally, the light decoupling surface 202a be provided with a suitable decoupling optics (for example pillow or roller optics). It is also conceivable to use the second light guide 202 with the light output surface 202a up to the first light guide 201 to introduce. In this case it is useful to use the first light guide 201 on the side of the light extraction surface 201a in the area of the light output surface 202a of the second light guide 202 to be provided with such a coupling-out optics.

The reflective coating 201f is in the area of the light output surface 202a with a recess 201h provided, is therefore not available there.

As can still be seen from the figures, is the light decoupling surface 202a of the second light guide 202 , in a view of the lighting device 200 against the direction of light emission LA seen, within the light output surface 201a of the first light guide 201 arranged. This gives the lighting device a very original appearance 200 realizable.

The light decoupling surfaces 201a and 202a again point in the same direction of light emission LA or at least in sections in the same light emission direction LA . In other words, the light decoupling surfaces are 201a , 202a the light guide 201 , 202 Aligned at least in sections in such a way that their imaginary surface normals point in the same light emission direction LA point.

One housing 206 Finally, it is used to accommodate the components mentioned, again with a light exit opening through a lens 207 closed is.

In a departure from the exemplary embodiment, it is also conceivable that the second light guide 202 is not flat, but rod-shaped. In this case, several rod-shaped light guides can be used, so that the in 4th visible appearance results (compare light coupling points 202a ' which can be, for example, polygonal, round or oval).

At the lighting device 200 it can be a two-part rear light of a motor vehicle K act, of which a part is outside in the body of the motor vehicle K and another part in a tailgate of the automobile K is arranged. It is conceivable that the lighting means 104b in cooperation with the first light guide 201 the light function of a taillight and the light source 104a in cooperation with the second light guide 202 the light function of a brake light or a direction indicator is implemented. Depending on which light function is to be implemented, the color of the light emitted by the illuminant can be changed 104a , 104b be chosen accordingly.

Also the 5 shows an embodiment with a lighting device 300 , in which a first flat light guide 301 and a second flat light guide 302 can be used. The material properties of the light guide 301 can be identical to those of the previously described light guides 101 respectively 201 to get voted. The material properties of the second light guide 302 can be identical to those of the previously described light guides 102 respectively 202 stand out.

From the 5 it becomes clear that the first light guide 301 on the back of the second light guide 302 is covered. Between the light guides 301 , 302 is a reflective coating 301f present. In the light guide 301 introduced, light-scattering imperfections are denoted by the reference symbol 301g figured.

The two light guides 301 , 302 are perpendicular to a common board 303 arranged, which in the mounting position of the lighting device 300 is oriented horizontally.

The first light guide 301 has a light output surface 301a and the second light guide 302 a light decoupling surface 302a on. The light decoupling surfaces 301a , 302a of the two light guides 301 and 302 are (as in the previous exemplary embodiments) in the direction or at least in sections in the direction of a light emission direction LA the lighting device 300 aligned. In other words, the light decoupling surfaces are 301a , 302a the light guide 301 , 302 Aligned at least in sections in such a way that their imaginary surface normals point in the same light emission direction LA point.

On the common board 303 serve bulbs 104b for coupling light beams into a light coupling surface 301e of the first light guide 301 and bulbs 104a for coupling light beams into a light coupling surface 302e of the second light guide 302 .

As is clear from the figures, the second light guide overlaps 302 the first light guide 301 edge side, so that, in a view of the lighting device 300 against the direction of light emission LA seen, the light output surface 301a of the first light guide 301 from the light output surface 302a of the second light guide 302 Is surrounded in a frame-like manner or at the edge.

Furthermore is the second light guide 302 in the edge area with a reversing bevel on the back 302f provided so that from the illuminants 104a into the light guide 302 coupled light rays with low loss in the direction of the light output surface 302a can be diverted.

The material of the first light guide 301 can be transparent or colored (for example colored red). It can be identical to the material of the light guides described above 101 and 201 be designed, so have slightly light-scattering properties.

The reflective coating 301f is not only on the back, but also on the edge of the first light guide 301 arranged. It is preferably on the first light guide 301 sprayed on and can be a white or metallic coating, for example.

An aperture 308 in turn serves to cover the light coupling area of the lighting device 300 .

The components mentioned are in one housing 306 added, the light exit opening with a lens 307 is covered.

It is in this embodiment of the lighting device 300 conceivable that through the bulbs 104b in cooperation with the first light guide 301 a tail light and through the bulbs 104a in cooperation with the second light guide 302 the light function of a brake light or a direction indicator is implemented.

Based on 7th an almost identical variant of the previous embodiment is shown. Again, two light guides are on a common circuit board 403 assigned which bulbs 104a and 104b wearing. Light beams of the illuminants coupled into the second light guide on the back 104a are only here via an upper, edge-side light decoupling surface 402a decoupled from the second light guide, which has a light decoupling surface 401a of the first light guide limited upwards at the edge. An aperture 408 also serves here to conceal a light coupling area of the lighting device 400 .

Finally, based on the 8th and 9 another embodiment of a lighting device 500 explained.

Also the lighting fixture 500 has a first light guide 501 and a second light guide 502 on. Both light guides 501 , 502 are flat in the sense of the invention. They each have a surface extension F1 or. F2 on and are with their area extension F1 , F2 aligned perpendicular to each other.

Here is the second light guide 502 with its areal extension F2 parallel to one common by the light guides 501 , 502 used board 503 or parallel to their surface extension F3 aligned. In the shown mounting position of the lighting device 500 is the board 503 horizontally aligned.

The second light guide 502 has a light coupling surface 502e on, in which the light from illuminants arranged in rows perpendicular to the plane of the drawing 104 can be coupled in or is coupled in.

That way into the light guide 502 Coupled light is partly via a deflecting slope 502f by about 90 degrees in the direction of a light output surface 502a of the second light guide 502 diverted. Another part of the coupled-in light, on the other hand, emerges from the second light guide 502 in the direction of the first light guide 501 and is via a light coupling surface 501e of the first Light guide 501 coupled into this. The light coupling surfaces 502e and 501e are arranged vertically one below the other. The light coupling surfaces 501e and or 502e can additionally be provided with an anti-reflective coating (not shown) in order to increase the efficiency of the light coupling.

That in the first light guide 501 Coupled light can in turn via light-scattering defects 501g and / or a reflective coating on the back 501f in the direction of a light decoupling surface 501a be redirected.

The light decoupling surfaces 501a , 502a the light guide 501 , 502 again point in the same direction of light emission LA . In other words, the light decoupling surfaces are 501a , 502a the light guide 501 , 502 Aligned at least in sections in such a way that their imaginary surface normals point in the same light emission direction LA point.

This embodiment offers the advantage that, depending on the choice of the deflecting bevel 502f Deflection angle formed a desired ratio between deflection and coupling out of the light, that is, a desired light distribution of the coupled light on the light guide 501 , 502 can be achieved. Between the deflection slope 502f and the light coupling surface 501e there is an air gap 502h.

Furthermore is the first light guide 501 again from a frame-like cover 505 in the direction of a light emission direction LA covered. The second light guide 502 is with its light output surface 502a into an aperture 508 introduced. The light decoupling surfaces 501a , 502a again point (at least in sections) in the same light emission direction LA .

The aforementioned components are in a housing indicated by dashed lines 506 housed, the light exit opening is in turn closed by a lens.

The material of the first light guide 501 can preferably like the material of the light guides described above 101 , 201 respectively 301 be trained. The material of the light guide 502 can be preferred like the material of the light guides described above 102 , 202 respectively 302 educated.

In the exemplary embodiment, the light guides are 501 and 502 thus made of different materials. In contrast to the exemplary embodiment, however, it is also conceivable that the light guides 501 , 502 are made of the same material.

List of reference symbols

100

Lighting device

101

first light guide

101a

Light output surface

101e

Light coupling surface

101f

reflective coating

101g

light-scattering imperfections

102

second light guide

102a, 102a '

Light output surface

102e

Light coupling surface

102f

Deflection slope

103

circuit board

104, 104a, 104b

Bulbs

105

frame-like aperture

106

casing

107

Lens

108

cover

200

Lighting device

201

first light guide

201a

Light output surface

201e

Light coupling surface

201f

reflective coating

201g

light-scattering imperfections

201h

Recess

202

second light guide

202a, 202a '

Light output surface

202e

Light coupling surface

202f

Deflection slope

203

circuit board

205

frame-like aperture

206

casing

207

Lens

300

Lighting device

301

first light guide

301a

Light output surface

301e

Light coupling surface

301f

reflective coating

301g

light-scattering imperfections

302

second light guide

302a

Light output surface

302e

Light coupling surface

302f

Deflection slope

303

circuit board

306

casing

307

Lens

308

cover

400

Lighting device

401a

Light output surface

402a

Light output surface

403

circuit board

408

cover

500

Lighting device

501

first light guide

501a

Light output surface

501e

Light coupling surface

501f

reflective coating

501g

light-scattering imperfections

502

second light guide

502a

Light output surface

502e

Light coupling surface

502f

Deflection slope

503

circuit board

505

frame-like aperture

506

casing

507

Lens

508

cover

b

broad

d1, d2

thickness

F1, F2, F3

Area extension

K

Motor vehicle

LA

Direction of light emission

L1, L2

Rays of light

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was 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.

Patent literature cited

• DE 102012220696 A1 [0002]

Claims (12)

Lighting device (100, 200, 300, 400, 500) for a motor vehicle (K), with a first light guide (101, 201, 301, 501) and at least one second light guide (102, 202, 302, 502), in each of which Light guides (101, 201, 301, 501; 102, 202, 302, 502) each light beam (L1, L2) of at least one illuminant (104, 104a, 104b) via at least one of the light guides (101, 201, 301, 501; 102 , 202, 302, 502) associated light coupling surface (101e, 201e, 301e, 501e; 102e, 202e, 302e, 502e) can be coupled in or are coupled in and coupled light beams (L1, L2) of the illuminant (104, 104a, 104b) are each over at least one light decoupling surface (101a, 201a, 301a, 501a; 102a, 202a, 302a, 502a) can be decoupled or decoupled from the light guide (101, 201, 301, 501; 102, 202, 302, 502), characterized in that that at least the first light guide (101, 201, 301, 501) is flat, with light rays (L1) entering the first light guide (101, 201, 3 01, 501) can be or are coupled in at the edge and which are connected to the light guides (101, 201, 301, 501; 102, 202, 302, 502) associated with light coupling surfaces (101e, 201e, 301e, 501e; 102e, 202e, 302e, 502e) facing illuminants (104, 104a, 104b) which are located on one of the light guides (101, 201, 301, 501; 102, 202, 302, 502) associated, common circuit board (103, 203, 303, 403, 503) are arranged, the light output surfaces (101a, 201a, 301a, 501a; 102a, 202a, 302a, 502a) of the light guides (101, 201, 301, 501; 102, 202, 302, 502) point at least in sections in the same light emission direction (LA). Lighting device (100, 200, 300, 400, 500) according to Claim 1 , characterized in that the second light guide (102, 202, 302, 502) is also flat, one edge side of the light guide (102, 202, 302, 502) serving as its light coupling surface (102e, 202e, 302e, 502e) and another edge side of the light guide (102, 202, 302, 502) than its light output surface (102a, 202a, 302a, 502a). Lighting device (100, 200, 300, 400, 500) according to Claim 1 , characterized in that the second light guide is rod-like, one end face of the light guide serving as its light coupling surface and another end face of the light guide (102, 202, 302, 502) serving as its light output coupling surface (102a ', 202a'). Lighting device (200) according to one of the preceding Claims 1 until 3 , characterized in that the light outcoupling surface (202a, 202a ') of the second light guide (202), seen in a plan view of the lighting device (200) against its light emission direction (LA), is within the light outcoupling surface (201a) of the first light guide (201) is located. Lighting device (300, 400) according to one of the preceding Claims 1 until 3 , characterized in that the light outcoupling surface (302a, 402a) of the second light guide (302), seen in a plan view of the lighting device (300, 400) against its light emission direction (LA), the light outcoupling surface (301a, 401a) of the first light guide (301 , 401) at least partially surrounds the edge. Lighting device (300, 400) according to Claim 5 , characterized in that the second light guide (302) covers the back of the first light guide (301) and overlaps the edge, the second light guide (302), seen in the cross section of the light guides (301, 302), having a rear deflecting bevel (302f) in the edge area having. Lighting device (100, 200, 300, 400, 500) according to one of the preceding claims, characterized in that the light guides (101, 102; 201, 202; 301, 302; 501, 502) are connected to one another in one piece. Lighting device (100, 500) according to one of the preceding claims, characterized in that the light guides (101, 102; 501, 502) are arranged perpendicular to one another. Lighting device (200, 300, 400) according to one of the preceding Claims 1 until 7th , characterized in that the light guides (201, 202; 301, 302) are arranged parallel to one another. Lighting device (100, 500) according to one of the preceding claims, characterized in that the first light guide (101, 501) with its surface extension (F1) perpendicular to a surface extension (F3) of the board (103, 503) and the second light guide (102 , 502) is aligned parallel to the surface extension (F3) of the board (103, 503), the second light guide (102, 502) having a deflecting bevel (102f, 502f) arranged in the region of its light coupling surface (102e, 502e) and the first light guide (101, 501) a reflective coating (101f, 501f) applied to the rear of this. Lighting device (200) according to one of the preceding claims, characterized in that the second light guide (202), seen against a light emission direction (LA) of the lighting device (200), is arranged behind the first light guide (201), the light decoupling surface (202a) of the second light guide (202) is directed onto the first light guide (201). Lighting device (100, 200, 300, 400, 500) according to one of the preceding claims, characterized in that the light function of a taillight, position light or daytime running light can be or is realized by the first light guide (101, 201, 301, 501) and by the second light guide (102, 202, 302, 502) the light function of a brake light or direction indicator.

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