DE102017109331A1 - Lighting device for vehicles - Google Patents

Abstract

Lighting device for vehicles with a closed by a transparent cover housing in which a light source (22, 32) and a hologram element (3) having optical unit for generating a holographic luminous graphics are arranged, wherein in the luminous flux direction (8) between the light source (22, 32) and the hologram element (3), blinding means (5, 15, 15 ', 25, 25', 35, 35 ', 40) are arranged in such a way that light (21) radiated from the light source (22) essentially exclusively acts on the light source Hologrammelement (3) or substantially exclusively on a light upstream of the hologram element (3) arranged light directing optical element (24), wherein the light directing optical element (24) is formed such that the incident on the same light (21) substantially exclusively on the Downstream arranged hologram element (3) is deflected.

Description

The invention relates to a lighting device for vehicles with a closed by a transparent cover housing, in which a light source and a hologram element having optical unit for generating a holographic illuminated graphics are arranged.

From the DE 10 2015 115 128 A1 a lighting device for vehicles is known which comprises a housing in which a light source and a hologram element having optical unit for generating a holographic illuminated graphics are arranged. The holographic luminous image generated by means of the hologram element allows a virtual luminous surface, which is arranged floating in space and thereby causes a spatial or depth effect. A disadvantage of the known lighting device is that the light source is arranged to the hologram element so that a portion of the emitted light as stray light can strike other components, in particular housing components. Reflection on such housing walls would lead to scattered light, which reduces the contrast of the hologram element and the quality of the illumination thereof deteriorates. In particular, when the reflected scattered light strikes the hologram element at a reconstruction angle, this can lead to a diffuse hologram image or holographic luminous image.

Object of the present invention is therefore to develop a lighting device for vehicles with a hologram element such that with simple means improved illumination of the hologram element is made possible.

To achieve this object, the invention is characterized in the preamble of claim 1, characterized in that in the light flow direction between the light source and the hologram element at least one blinding agent is arranged such that light emitted from the light source substantially exclusively on the hologram element or substantially exclusively on a upstream of the hologram element arranged light-directing optical element, wherein the light-directing optical element is designed such that the incident on the same light is deflected substantially exclusively on the light downstream hologram element.

According to the invention, blending agents are arranged in the luminous flux direction between the light source and the hologram element, so that the light emitted by the light source strikes substantially exclusively the hologram element or a light-directing optical element arranged upstream of the hologram element. In the first case, a direct illumination of the hologram element takes place, since no further optical element is arranged between a light source unit receiving the light source and the hologram element. In the second case, an indirect illumination of the hologram element takes place, since the light-directing optical element, for example a reflector, is arranged between the light source unit and the hologram element. In this case, the light-directing optical element is designed in such a way that the light striking it is deflected essentially exclusively onto the hologram element arranged downstream of the light. The invention thus largely makes it possible to avoid stray light which could undesirably strike the hologram element.

Advantageously, the impact of stray light on the hologram element is reduced to a minimum.

According to a preferred embodiment of the invention, the glare is formed as a curtain wall, which preferably extends widened in the direction of light flow. As a result, edge beams of the light beam emitted by the light source can advantageously impinge on the glare wall only at a relatively flat angle, so that any unwanted reflection on the glare wall merely leads to treflected light beams which strike an edge region of the hologram element.

According to a development of the invention, the glare wall is conical, so that there is a rotational symmetry between the point light source and the hologram element.

According to a development of the invention, the diaphragm wall has a widening in the light emission direction of the light source opening angle in the range of 40 ° to 60 °. This ensures that the hologram element can be backlit with a relatively high intensity.

According to a development of the invention, the glare means can be formed as a housing wall of a light source and the hologram element receiving hologram module. Advantageously, this allows a defined presetting of the light source and the hologram-relevant optical elements. The hologram module can be easily mounted in a desired location within a housing of the lighting device.

According to a development of the invention, the glare is formed as a matt black diffuse-acting surface or as a surface provided with optical scattering means. Advantageously, the scattering effect can be counteracted thereby.

According to a development of the invention, the glare and / or opening angle of the glare wall is designed in such a way that a light component emitted by the light source and striking the glare means or the glare wall is directed in the direction of a scatter light reception unit arranged next to the hologram element. Thus, if the occurrence of scattered light can not be avoided, the scattered light can be channeled according to the invention into a region which, in addition to or at a distance from the hologram element, comprises the scattered light receiving region. This ensures that the scattered light does not impinge on the hologram element.

According to a development of the invention, the light source is arranged laterally offset from the hologram element in projection on a plane perpendicular to the main emission direction of the illumination device. Advantageously, the light source is thus not visible to a viewer.

According to a development of the invention, a second light source for generating a second illuminated graphic is provided in the housing of the hologram light module, wherein the second light source is also associated with a glare. The glare means of the second light source is designed and / or arranged such that the light emitted by the second light source does not strike at a reconstruction angle of the holographic light image generated by the first light source. This ensures that when the second light source is activated to produce the second light graphic, at least a part of the first holographic light graphic is not undesirably visible.

According to a development of the invention, the light-directing optical element is designed as a reflector, which is arranged in the housing on an opposite side of the light source.

Either the light source with the housing or the hologram element is positively connected to the housing. Advantageously, different pre-settings of the individual components can thereby be achieved for the holographic function. However, it is also possible for both the light source and the hologram element to be frictionally connected to the housing.

Embodiments of the invention are explained below with reference to the drawings.

• 1 eine schematische Seitenansicht einer Beleuchtungsvorrichtung nach einer ersten Ausführungsform einer mit konusförmigen Blendmitteln versehenen Beleuchtungsvorrichtung,
• 2 eine schematische Seitenansicht der Beleuchtungsvorrichtung nach einer zweiten Ausführungsform mit einer neben einem Hologrammelement angeordneten Streulichtaufnahmeeinheit,
• 3 eine vergrößerte Darstellung einer Einzelheit X der Streulichtaufnahmeeinheit gemäß 2,
• 4 eine schematische Seitenansicht einer Beleuchtungsvorrichtung mit einer seitlich angeordneten Lichtquelle,
• 5 eine schematische Seitenansicht einer Beleuchtungsvorrichtung mit seitlich angeordneter Lichtquelle und neben dem Hologrammelement angeordneten Streulichtaufnahmeeinheit,
• 6 eine vergrößerte Darstellung einer Einzelheit Y einer Blendwandung der Beleuchtungsvorrichtung gemäß 5,
• 7 eine schematische Seitenansicht der Beleuchtungsvorrichtung mit einer seitlich angeordneten Lichtquelle, der eine Linse zugeordnet ist,
• 8 eine Seitenansicht der Beleuchtungsvorrichtung mit bezüglich des Hologrammelementes gegenüberliegend angeordneten Lichtquelle und einem Reflektor als lichtlenkendes Element,
• 9 eine Seitenansicht der Beleuchtungsvorrichtung nach einer weiteren Ausführungsform der Erfindung,
• 10 eine Seitenansicht der Beleuchtungsvorrichtung nach einer weiteren Ausführungsform,
• 11 eine Seitenansicht der Beleuchtungsvorrichtung mit einer Lichtquelle, die auf ein Reflexionshologrammelement gerichtet ist,
• 12 eine Seitenansicht der Beleuchtungsvorrichtung mit einem Reflexionshologrammelement und einer entfernt zu demselben angeordneten Lichtquelle,
• 13 eine Seitenansicht der Beleuchtungsvorrichtung mit zwei im Wesentlichen senkrecht zueinander orientierten Lichtquellen zur Erzeugung von zwei unterschiedlichen Leuchtgrafiken,
• 14 eine schematische Seitenansicht der Beleuchtungsvorrichtung mit zwei in einem Winkel zueinander angeordneten Lichtquellen zur Erzeugung von zwei unterschiedlichen holografischen Leuchtgrafiken, wobei eine Leiterplatte der Lichtquelle mit einem Gehäuse des Hologrammlichtmoduls verschraubt ist und
• 15 eine Seitenansicht der Beleuchtungsvorrichtung, wobei das Hologrammelement mit dem Gehäuse des Hologrammlichtmoduls verschraubt ist.

Show it:

• 1 FIG. 2 a schematic side view of a lighting device according to a first embodiment of a lighting device provided with conical blending means, FIG.
• 2 FIG. 2 a schematic side view of the lighting device according to a second embodiment with a scattered light receiving unit arranged next to a hologram element, FIG.
• 3 an enlarged view of a detail X of the scattered light receiving unit according to 2 .
• 4 a schematic side view of a lighting device with a laterally arranged light source,
• 5 FIG. 2 a schematic side view of a lighting device with laterally arranged light source and scattered light receiving unit arranged next to the hologram element, FIG.
• 6 an enlarged view of a detail Y of a curtain wall of the lighting device according to 5 .
• 7 3 a schematic side view of the illumination device with a laterally arranged light source, which is associated with a lens,
• 8th a side view of the illumination device with respect to the hologram element opposite arranged light source and a reflector as a light-guiding element,
• 9 a side view of the lighting device according to a further embodiment of the invention,
• 10 a side view of the lighting device according to another embodiment,
• 11 a side view of the illumination device with a light source, which is directed to a reflection hologram element,
• 12 a side view of the illumination device with a reflection hologram element and a remote light source arranged to the same,
• 13 a side view of the lighting device with two substantially perpendicular to each other light sources oriented to produce two different lighting graphics,
• 14 a schematic side view of the lighting device with two light sources arranged at an angle to each other for the production of two different holographic lighting graphics, wherein a circuit board of the light source is bolted to a housing of the hologram light module and
• 15 a side view of the lighting device, wherein the hologram element is screwed to the housing of the hologram light module.

A lighting device according to the invention serves to generate signal functions, such as a direction indicator, taillight, brake light, position light or daytime running light function. It can be used in the rear or bow area of the vehicle or as another lamp, for example in the interior of the vehicle.

According to a first embodiment of the invention according to 1 is a hologram light module in a housing, not shown, of the lighting device 1 integrated, which is essentially a light source unit 2 and a hologram element 3 comprising having optical unit. The light source unit 2 has an LED light source 22 on. The light source unit 2 may be formed by one or more LED chips. Alternatively, the light source unit 2 also have another semiconductor-based, for example, a laser light source having.

An optical axis 4 the light source 22 runs in the direction of a main emission direction H the lighting device. In main emission direction H in front of the hologram element 3 or in front of the hologram light module 1 a transparent cover plate, not shown, is provided which covers an opening of the housing of the lighting device in a conventional manner.

Between the light source 22 and substantially perpendicular to the main emission direction H extending hologram element 3 runs as a blend a conically widening Blendwandung 5 , The dazzling wall 5 For example, it may be circular or ellipsoidal in cross-section. The dazzling wall 5 runs in the present embodiment according to 1 in one the optical axis 4 having a cutting plane straight to an edge 6 of the hologram element 3 , A hologram element 3 facing end region 7 the dazzling wall 5 is formed frame-shaped and serves to receive the hologram element 3 , The dazzling wall 5 closes in the direction of the luminous flux 8th the light source 22 an opening angle φ preferably in the range of 60 ° to 80 °, in the present embodiment 70 °, a.

The dazzling wall 5 is part of a housing wall of the hologram light module 1 and can be on one of the light source 22 facing side a holder, not shown, for the light source 22 exhibit.

The hologram element 3 may be formed as a surface hologram element having a diffractive / holographic structure or as a volume hologram element having a transparent photopolymer film. Becomes the hologram element 3 from the light of the light source 22 illuminated, there is a light steering due to the in the hologram element 3 impressed diffraction structure corresponding to a predetermined spectral geometric intensity distribution function. For this purpose, the light source 22 positioned such that light emitted by it according to the reference or reconstruction direction on the hologram element 3 meets.

In the present embodiment, the hologram element 3 is formed as a transmission hologram element in which the light comes from a back side through the hologram element 3 in the direction of a front and in the main direction of radiation H is diverted.

According to a second embodiment of the invention according to the 2 and 3 is different from the embodiment according to 1 a stray light receiving unit 9 within the hologram light module 1 provided for receiving an undesirable scattered light component 10 of the light source 22 radiated luminous flux is used. The scattered light pickup unit 9 is immediately adjacent to the edge 6 of the hologram element 3 arranged. The scattered light pickup unit 9 is in extension of the curtain wall 5 arranged, with a front edge 11 the dazzling wall 5 with the edge 6 of the hologram element 3 combines. The scattered light pickup unit 9 is pocket-shaped in cross section with two opposite legs 12 , which are in a crest area with each other through a bottom piece 13 are connected. If the hologram element 3 has a circular or ellipsoidal contour, also extends the scattered light receiving unit 9 circular or ellipsoidal. The scattered light pickup unit 9 preferably extends continuously and circumferentially around the edge 6 of the hologram element 3 , It has such a receiving width b on top of that on the dazzling wall 5 impinging scattered light component 10 in the scattered light receiving unit 9 enters and vagabond in the same and thus no longer out of the hologram light module 1 can escape.

Preferably, the glare wall 5 on at least the hologram element 3 facing inside as a matte black, diffuse-acting surface or as a provided with optical scattering means surface. For example, the inside of the curtain wall 5 be provided with an antireflection coating (moth eye structure). Alternatively, the inside of the curtain wall 5 with an in 3 shown Streuprismenstruktur 14 be provided. The Streuprismenstruktur 14 is like that designed that collection of unwanted spill light 10 of the light source 22 radiated light in the direction of the scattered light receiving unit 9 directed or "collected".

The same components or component functions of the embodiments are provided with the same reference numerals.

According to an alternative embodiment of the invention, not shown, the scattered light receiving unit 9 even at a distance to the edge 6 of the hologram element 3 be arranged.

According to a further embodiment of the invention according to 4 is the light source 22 laterally offset to the hologram element 3 arranged. The light source 22 is therefore not visible to the viewer from the outside. The light source 22 is in projection on one to the main emission direction H the lighting device vertical plane e next to the hologram element 3 or arranged laterally offset to the same. This results in an asymmetrically designed glare, wherein the glare a short glare wall 15 and a long curtain wall 15 ' having. Front edges of the short dazzling wall 15 or long glare wall 15 ' close the hologram element 3 like a frame.

According to one embodiment of the invention according to the 5 and 6 can in contrast to the embodiment according to 4 the long curtain wall 15 ' a Streuprismenstruktur 16 have, so that the striking stray light component 10 of the light source 22 emitted light in the direction of a to the short Blendwandung 15 subsequent scattered light receiving unit 19 meets. The scattered light pickup unit 19 is like stray light imaging unit 9 designed such that the incoming light (stray light 10 ) in the same vagabond, without re-emerge.

According to a further embodiment of the invention according to 7 can in contrast to the embodiment according to 4 the light source unit 2 a light source 22 and one of them immediately upstream and formed as a primary optics unit lens 23 by means of which of the light source 22 radiated light 20 so that it is collected exclusively on the hologram element 3 meets. On a long curtain wall 15 ' - As in the embodiment according to 4 - Can be omitted here. The Lens 23 serves as a light directing optical element.

According to a further embodiment of the invention according to 8th the optical unit has a reflector surface as light-directing optical element 24 on, with respect to the hologram element 3 on an opposite side to the light source 22 is arranged. As a glare means extends from the light source 22 in the direction of the reflector surface 24 a front glare wall 25 " as well as a rear long curtain wall 25 ' , wherein the front Blendwandung 25 " away from the light source 22 in the direction of the reflector surface 24 so far extends that a direct emission of light 20 the light source 22 in the direction of the hologram element 3 is prevented. The rear long curtain wall 25 ' is on a hologram element 3 opposite side of an opening 26 arranged the Blendmittel and extends continuously from the light source 22 to the reflector surface 24 , The short front dazzling wall 25 " and the long curtain wall 25 ' are shaped so that that of the light source 22 radiated light 20 only on the reflector surface 24 which is formed such that of the reflector surface 24 as light-deflecting element reflected light 20 exclusively on the hologram element 3 meets. The short front dazzling wall 25 " and the long curtain wall 25 ' form a depression in which the light source 22 is arranged.

Both the reflector surface 24 as well as the light source 22 are laterally offset from the hologram element 3 arranged so that they are not visible to a viewer from the outside. When projecting the light source 22 and the reflector surface 24 on the extension plane e of the hologram element 3 These two components are outside the hologram element 3 or at a distance to the edge 6 of the hologram element 3 ,

According to a further embodiment of the invention according to 9 is the light source 22 in the main emission direction H behind the hologram element 3 arranged while the reflector surface 24 furthermore laterally offset to the hologram element 3 is arranged. As a glare are the light source 22 associated glare walls 35 provided, which are designed such that the of the light source 22 radiated light 20 only on the reflector surface 24 meets. As a blend 35 ' Blendwandungen are provided which are designed such that the of the reflector surface 24 reflected light 20 exclusively on the hologram element 3 meets. One of the light source 22 facing part of the curtain wall 35 ' is integral with one in Hauptabstrahlrichtung H front part of the curtain wall 35 connected.

According to a further embodiment of the invention according to 10 is the light source 22 laterally offset to the hologram element 3 arranged. That from the light source 22 radiated light 20 is opposite to the main emission direction H emitted and from the reflector surface 24 reflected. As a glare are essentially the Blendwandungen 35 ' intended.

The aforementioned hologram elements 3 are each formed as a transmission hologram elements. According to a further embodiment of the invention according to 11 can the hologram element 3 also as a reflection hologram element 30 be formed at the of the light source 22 radiated light 20 in the main emission direction H is reflected. Between the light source 22 and the lens associated therewith 23 on the one hand and the hologram element 30 on the other hand, are glare 40 arranged so that from the light source 22 radiated light 20 exclusively on the hologram element 30 meets. The blinding agents 40 are designed as a flat Blendwandungen, with an opening 41 to the passage of light 20 is provided.

According to an alternative embodiment of the invention according to 12 can the light source 22 also at a main radiation direction H front front of the hologram light module 1 be arranged, wherein the reflector surface 24 the deflection of the light source 22 radiated light 20 in the direction of the reflection hologram element 30 causes. The blinding agents 40 have such an opening 41 on that from the reflector surface 24 reflected light 20 exclusively on the reflection hologram element 30 meets.

According to a further embodiment of the invention according to 13 is different from the embodiment according to 8th a second light source 32 provided in a rear area of the hologram light module 1 is arranged. The second light source 32 is a light guide element as a primary optic element 33 upstream, with a front decoupling surface 34 near a shutter 27 enough. The aperture 27 is through a breakthrough of the long curtain wall 25 ' educated. The light guide 33 is relative to the aperture 27 arranged such that light exiting from the same 21 at least over the hologram element 3 can be radiated into the environment for generating a second illuminated graphic. The second light source 32 or the same associated light guide 33 is so to the first light source 22 or the reflector surface 24 arranged that from the second light source 32 emitted light is not under one of the first light source 22 generated holographic luminous graphics associated with the reconstruction angle on the hologram element 3 meets. To avoid such mutual interference is the light source 22 having light source unit 2 substantially perpendicular or at a right angle to that through the second light source 32 and the light guide 33 formed second light source unit 31 arranged.

According to a further embodiment of the invention according to 14 is the light source 22 the first light source unit 2 and the light source 32 the second light source unit 31 on a lower side of the hologram light module 1 arranged, wherein they are aligned substantially perpendicular or at a near 90 ° angle to each other. The reflector surface 24 is in a housing 38 of the hologram light module 1 integrated arranged. The light source 22 is on a backing plate 39 arranged, via a screw connection 42 non-positively with the housing 38 connected is. In the direction of the light in front of the light source 22 is the lens 23 arranged, by means of which of the light source 22 radiated light is collected so that it is exclusively on the reflector surface 24 meets. By means of the screw connection 42 is an adjustment of the light source 22 relative to the hologram element 3 ensures, with the hologram element 3 firmly in the housing 38 is installed.

According to an alternative embodiment of the invention according to 15 can in contrast to the embodiment according to 14 the hologram element 3 over the screw connection 42 non-positively with the housing 38 be connected. In this embodiment, the light source 22 with the carrier plate 39 firmly installed in the housing. By adjusting the screw connection 42 is an adjustment of the hologram element 3 relative to the light source 22 guaranteed.

It is understood that the mentioned features of the embodiments can also be combined with each other. In particular, the shape of the surface coating of the blend can be optionally combined for each embodiment of the invention.

LIST OF REFERENCE NUMBERS

1

Hologram light module

2

Light source unit

3

hologram element

4

optical axis

5

blind wall

6

edge

7

end

8th

Luminous flux direction

9

Scattered light receiving unit

10

Stray light

11

edge

12

leg

13

breech

14

Scattered prismatic structure

15.15 '

short glare wall / long glare wall

16

Scattered prismatic structure

19

Scattered light receiving unit

20

light

21

light

22

light source

23

lens

24

reflector surface

25.25 '

short glare wall / long glare wall

26

opening

27

aperture

30

Reflection hologram element

31

2. Light source unit

32

2. Light source

33

light guide

34

outcoupling

35.35 '

blend funds

38

casing

39

support plate

40

blend funds

41

opening

42

screw

H

main radiation

e

extension plane

b

width

φ

opening angle

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 102015115128 A1 [0002]

Claims (10)

Lighting device for vehicles with a closed by a transparent cover housing in which a light source (22, 32) and a hologram element (3) having optical unit for generating a holographic luminous image are arranged, characterized in that in the luminous flux direction (8) between the light source (22, 32) and the hologram element (3) at least one glare means (5; 15, 15 '; 25, 25'; 35, 35 '; 40) is arranged such that light (21) emitted by the light source (22) is arranged. essentially exclusively on the hologram element (3) or substantially exclusively on a light-directing optical element (24) arranged upstream of the hologram element (3), wherein the light-directing optical element (24) is designed such that the light (21) striking the same is deflected substantially exclusively on the lustrel downstream hologram element (3). Lighting device after Claim 1 , characterized in that the glare means (5; 15, 15 '; 25, 25'; 35, 35 '; 40) has a gliding wall (5) which widens in the light flow direction. Lighting device after Claim 2 , characterized in that the Blendwandung (5) is conical. Lighting device after Claim 2 or 3 , characterized in that the glare wall (5) widens in the luminous flux direction (8) of the light source by an opening angle (φ) in the range of 60 ° to 80 °. Lighting device according to one of Claims 1 to 4 , characterized in that the glare means (5, 15, 15 ', 25, 25', 35, 35 ', 40) is formed as a housing wall of a light source and the hologram element (3) receiving hologram light module (1). Lighting device according to one of Claims 1 to 5 , characterized in that the blending means (5; 15, 15 '; 25, 25'; 35, 35 '; 40) is designed as a matt black, diffusely acting surface or as a surface provided with optical scattering means. Lighting device according to one of Claims 1 to 6 , characterized in that the glare means (5, 15, 15 ', 25, 25', 35, 35 ', 40) and / or the opening angle (φ) of the glare wall (5) is designed such that a light emitted by the light source and the scattered light component (19) striking the diaphragm (5; 15, 15 '; 25, 25'; 35, 35 '; 40) or the diaphragm wall (5) in the direction of one beside and / or at a distance from the hologram element (3 ) or the light-directing optical element (24) arranged scattered light receiving unit (9, 19) is directed. Lighting device according to one of Claims 1 to 7 , characterized in that the light source in projection on an extension plane (E) of the hologram element (3) laterally offset from the hologram element (3) is arranged. Lighting device according to one of Claims 1 to 8th , characterized in that a second light source (32) for generating a second luminous image is associated with at least one blend means, which is designed and / or arranged such that emitted by the second light source (32) light is not under one of the first holographic luminous image associated Rekonstruktionswinkel meets the hologram element (3). Lighting device according to one of Claims 1 to 9 , characterized in that the light directing optical element is formed as a reflector which is arranged in the housing (38) of the hologram light module (1) on a side opposite the light source, and in that the light source with the housing and / or the hologram element with the housing positively connected.

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