DE102019122318A1 - Arrangement for illuminating a volume hologram and illuminating device for a motor vehicle with such an arrangement - Google Patents

Abstract

Arrangement for illuminating a volume hologram (11), comprising a volume hologram (11) which has an optical axis (12) and a reference direction (13), the reference angle (a) between the optical axis and the reference direction (13) not equal to 0 ° and is not equal to 180 °, so that the optical axis (12) and the reference direction (13) span a reference plane (14), a device (10) for illuminating a volume hologram (11) which has a plurality of light sources (15), from which light (16) emanates during operation of the device (10) which at least partially strikes the volume hologram (11) in order to reconstruct it, the light sources (15) in the reference plane (14) or in one of the reference plane ( 14) are arranged in parallel plane.

Description

The present invention relates to an arrangement for illuminating a volume hologram according to the preamble of claim 1 and according to the preamble of claim 3 as well as a lighting device for a motor vehicle with such an arrangement.

An arrangement of the aforementioned type is from WO 2010/076571 A1 known. In one of the arrangements described therein, a plurality of light sources are provided for illuminating and reconstructing the hologram. Due to the overlapping light of the plurality of light sources on the hologram, multiple reconstructions of the hologram occur. Depending on the distance between the light sources and the distance to the hologram, these appear as double images or as image blurring.

A typical arrangement of a plurality of light sources that generate a multiple reconstruction of the hologram is shown for a transmission hologram by the 6a and 6b as well as for a reflection hologram by the 12a and 12b clarified.

This in 6a and 6b pictured volume hologram 1 has an optical axis 2 and a reference direction 3 on, parallel to the light should be irradiated to form the volume hologram 1 to reconstruct. The optical axis close 2 and the reference direction 3 a reference angle α with each other, which is not equal to 0 ° and not equal to 180 °, so that the optical axis 2 and the reference direction 3 Spanning a plane, which is called the reference plane in the following.

The device according to 6a and 6b includes three light sources 4th which are arranged side by side in a direction perpendicular to the reference plane. This arrangement of the light sources 4th due to the angle selectivity or the angle-dependent efficiency of the hologram, the occurrence of undesired multiple reconstructions is favorable to one another. The use of a light source with an elongated light exit surface, the longitudinal direction of which is perpendicular to the reference plane, has a comparable effect.

For use in a lighting device for a motor vehicle, arrangements for illuminating a volume hologram with only one light source, in particular only one light-emitting diode (LED), can only be used to a limited extent because the light intensity is insufficient for many types of lights such as tail lights. However, if more than one light source is used, there is a risk that the undesired multiple reconstructions will occur.

The problem on which the present invention is based is to create an arrangement of the type mentioned at the beginning in which the occurrence of multiple reconstructions is reduced or prevented. Furthermore, a lighting device of the type mentioned is to be specified.

This is achieved according to the invention by an arrangement of the type mentioned with the characterizing features of claim 1, an arrangement of the type mentioned with the characterizing features of claim 3 and by a lighting device with the features of claim 15. The subclaims relate to preferred embodiments of the invention.

According to claim 1 it is provided that the light sources are arranged in the reference plane or in a plane parallel to the reference plane. By arranging the light sources in the reference plane or in a plane parallel to the reference plane, the occurrence of undesired multiple reconstructions can be reduced or prevented. As a result, several light sources can be used without having to accept the disadvantages of multiple reconstructions.

It can be provided that the light sources are designed as light emitting diodes (LED).

According to claim 3 it is provided that the first direction is arranged in the reference plane or in a plane parallel to the reference plane. In particular, the second direction can be oriented perpendicular to the reference plane. The occurrence of undesired multiple reconstructions can also be reduced or prevented by arranging the first direction of an elongated light exit surface of a light source in the reference plane or in a plane parallel to the reference plane. This means that flat light sources can also be used without having to accept the disadvantages of multiple reconstructions.

The at least one light source can be designed as an organic light-emitting diode (OLED). Alternatively, the at least one light source can be designed as a two-row or multi-row LED matrix, the at least two rows of the LED matrix being arranged next to one another in the second direction.

There is the possibility that the light exit surface in the first direction is larger than 5 mm, in particular larger than 10 mm, preferably larger than 20 mm. By correspondingly large lengths the light exit surface can be used to increase the amount of light used for the reconstruction. Furthermore, it can be provided that the light exit surface in the second direction is smaller than 20 mm, in particular smaller than 10 mm, preferably smaller than 5 mm. With dimensions of the light exit surface in the second direction that are greater than, for example, 20 mm, there is the possibility that disruptive multiple reconstructions will occur.

There is the possibility that the volume hologram and the plurality of light sources or the at least one light source are arranged in such a way that the reconstruction of the volume hologram takes place in a reflection arrangement. The device can include at least one screen or at least one housing part which at least partially conceals the at least one light source or the plurality of light sources. In this way, only the hologram is essentially visible to the viewer, whereas the at least one light source remains largely invisible.

As an alternative, there is the possibility that the volume hologram and the plurality of light sources or the at least one light source are arranged in such a way that the reconstruction of the volume hologram takes place in a transmission arrangement.

In particular in the case of a transmission arrangement, at least one optical component can be arranged between the volume hologram and the at least one light source or the plurality of light sources, which is designed, for example, as a diffuser or as TIR optics or as a microstructure or as a nanostructure or as a light guide or a diffuser or a TIR optics or a microstructure or a nanostructure or a light guide comprises. By means of this optical component, the at least one light source can be integrated as a homogeneously luminous element into the design of the overall arrangement, for example into the design of a vehicle light.

It can be provided that the optical component is an Edgelit light guide, in which light can be coupled out laterally and frontally, with the laterally coupled out light in particular striking the volume hologram at least partially in order to reconstruct it, whereas the frontally Outcoupled light serves a different light function. As a result of the lateral coupling-out of the light, the at least one light source can be arranged invisible to the user.

The volume hologram can be a computer-generated volume hologram.

According to claim 15 it is provided that the lighting device for a motor vehicle comprises an arrangement according to the invention.

• 1a eine perspektivische Ansicht einer ersten Ausführungsform einer erfindungsgemäßen Anordnung;
• 1 b eine Vorderansicht der Anordnung gemäß 1a;
• 2a eine perspektivische Ansicht einer zweiten Ausführungsform einer erfindungsgemäßen Anordnung;
• 2b eine Vorderansicht der Anordnung gemäß 2a;
• 3a eine perspektivische Ansicht einer dritten Ausführungsform einer erfindungsgemäßen Anordnung;
• 3b eine Vorderansicht der Anordnung gemäß 3a;
• 4a eine perspektivische Ansicht einer vierten Ausführungsform einer erfindungsgemäßen Anordnung;
• 4b eine Vorderansicht der Anordnung gemäß 4a;
• 5a eine perspektivische Ansicht einer fünften Ausführungsform einer erfindungsgemäßen Anordnung;
• 5b eine Vorderansicht der Anordnung gemäß 5a;
• 6a eine perspektivische Ansicht einer nicht von der Erfindung umfassten Ausführungsform einer Anordnung zur Beleuchtung eines Volumenhologramms;
• 6b eine Vorderansicht der Anordnung gemäß 6a;
• 7a eine perspektivische Ansicht einer sechsten Ausführungsform einer erfindungsgemäßen Anordnung;
• 7b eine Vorderansicht der Anordnung gemäß 7a;
• 8a eine perspektivische Ansicht einer siebten Ausführungsform einer erfindungsgemäßen Anordnung;
• 8b eine Vorderansicht der Anordnung gemäß 8a;
• 9a eine perspektivische Ansicht einer achten Ausführungsform einer erfindungsgemäßen Anordnung;
• 9b eine Vorderansicht der Anordnung gemäß 9a;
• 10a eine perspektivische Ansicht einer neunten Ausführungsform einer erfindungsgemäßen Anordnung;
• 10b eine Vorderansicht der Anordnung gemäß 10a;
• 11a eine perspektivische Ansicht einer zehnten Ausführungsform einer erfindungsgemäßen Anordnung;
• 11b eine Vorderansicht der Anordnung gemäß 11a;
• 12a eine perspektivische Ansicht einer nicht von der Erfindung umfassten Ausführungsform einer Anordnung zur Beleuchtung eines Volumenhologramms;
• 12b eine Vorderansicht der Anordnung gemäß 12a.

The invention is explained in more detail below with reference to the accompanying drawings. It shows:

• 1a a perspective view of a first embodiment of an arrangement according to the invention;
• 1 b a front view of the arrangement according to 1a ;
• 2a a perspective view of a second embodiment of an arrangement according to the invention;
• 2 B a front view of the arrangement according to 2a ;
• 3a a perspective view of a third embodiment of an arrangement according to the invention;
• 3b a front view of the arrangement according to 3a ;
• 4a a perspective view of a fourth embodiment of an arrangement according to the invention;
• 4b a front view of the arrangement according to 4a ;
• 5a a perspective view of a fifth embodiment of an arrangement according to the invention;
• 5b a front view of the arrangement according to 5a ;
• 6a a perspective view of an embodiment not encompassed by the invention of an arrangement for illuminating a volume hologram;
• 6b a front view of the arrangement according to 6a ;
• 7a a perspective view of a sixth embodiment of an arrangement according to the invention;
• 7b a front view of the arrangement according to 7a ;
• 8a a perspective view of a seventh embodiment of an arrangement according to the invention;
• 8b a front view of the arrangement according to 8a ;
• 9a a perspective view of an eighth embodiment of an arrangement according to the invention;
• 9b a front view of the arrangement according to 9a ;
• 10a a perspective view of a ninth embodiment of an arrangement according to the invention;
• 10b a front view of the arrangement according to 10a ;
• 11a a perspective view of a tenth embodiment of an arrangement according to the invention;
• 11b a front view of the arrangement according to 11a ;
• 12a a perspective view of an embodiment not encompassed by the invention of an arrangement for illuminating a volume hologram;
• 12b a front view of the arrangement according to 12a .

Identical and functionally identical parts are provided with the same reference symbols in the figures.

In the 1a and 1b depicted arrangement comprises a device 10 for illuminating a volume hologram 11 with which the reconstruction of the volume hologram 11 takes place in a transmission arrangement. The volume hologram 11 as known from the prior art, has an optical axis 12 and a reference direction 13 on having a reference angle α include each other that is not equal to 0 ° and not equal to 180 °. A section of the from the optical axis 12 and the reference direction 13 spanned reference plane 14th is in 1a indicated by hatching. The reference plane 14th so extends in 1b in the vertical direction and in the plane of the drawing 1b inside.

The volume hologram 11 is preferably a computer-generated volume hologram.

The device 10 comprises three light sources in the illustrated embodiment 15th , whose light 16 on the volume hologram 11 hits to reconstruct it. The light sources 15th can for example be designed as light emitting diodes (LED). The light sources 15th are at least partially in the middle behind the volume hologram 11 arranged (see 1b) . There is definitely the possibility of more than three light sources 15th or just two light sources 15th to be provided.

The light sources 15th are spaced from one another and all arranged in a plane that is the reference plane 14th corresponds to or parallel to the reference plane 14th is. Preferably the light sources are 15th arranged side by side in one direction that is in the reference plane 14th or in one to the reference plane 14th parallel plane. Through the arrangement of the light sources 15th in the reference plane 14th or in one to the reference plane 14th parallel plane, the occurrence of undesired multiple reconstructions is reduced or prevented.

In the 2a and 2 B The arrangement shown also includes a device 10 for illuminating a volume hologram 11 with which the reconstruction of the volume hologram 11 takes place in a transmission arrangement. At the in 2a and 2 B depicted arrangement includes the device 10 a light source 17th that have an elongated light exit surface 18th having. The light source 17th is at least partially in the middle behind the volume hologram 11 arranged (see 2 B) .

The light emitting surface 18th points in a first direction X (see the Cartesian coordinate system in 2 B) a significantly larger extent than in the second perpendicular direction Y on. For example, the extent of the light exit surface 18th in the first direction X be greater than 20 mm, for example 40 mm, whereas the extension in the second direction Y smaller than 10 mm, for example 5 mm. The first direction extends here X in the reference plane 14th whereas the second direction Y perpendicular to the reference plane 14th is aligned.

Also by such an arrangement of the elongated light exit surface 18th the light source 17th relative to the reference plane 14th the occurrence of undesired multiple reconstructions is reduced or prevented.

At the light source 17th it can be, for example, an organic light-emitting diode (OLED). Alternatively, a plurality of light-emitting diodes can also be provided, for example in a single-line or two-line matrix arrangement, which together form an elongated light exit surface. Alternatively, one or more light-emitting diodes with at least one optical component can also be provided, which can contribute to the formation of an elongated light exit surface. Examples of such an optical component are a diffuser or TIR optics or a microstructure or a nanostructure or a light guide.

In the 3a and 3b The arrangement shown also includes a device 10 for illuminating a volume hologram 11 with which the reconstruction of the volume hologram 11 takes place in a transmission arrangement.

At the in 3a and 3b depicted arrangement includes the device 10 two light source 17th , each with an elongated light exit surface 18th exhibit. The light sources correspond 17th with regard to the alignment and nature of the light exit surface 18th according to the embodiment 2a and 2 B . However, the two light sources are 17th not in the middle behind the volume hologram 11 but rather laterally on the edges of the volume hologram in the positive and negative Y-direction 11 .

A comparable arrangement is out 5a and 5b visible, but the reference plane 14th in 5b in the horizontal direction and in the plane of the drawing 5b extends into it. The elongated light exit surfaces are accordingly 18th of the two light sources 17th also horizontally in 5b arranged.

In the 4a and 4b depicted arrangement comprises a device 10 for lighting and three volume holograms 11 , the reconstruction of the volume holograms 11 also takes place in a transmission arrangement. The device 10 has three light sources 17th on, side by side and each at least partially in the middle behind one of the volume holograms 11 are arranged (see 4b) . The light sources 17th each have an elongated light exit surface 18th on that with regard to the alignment and nature of the light exit surface 18th according to the embodiment 2a and 2 B can correspond.

In the 7a and 7b depicted arrangement comprises a device 10 for illuminating a volume hologram 11 with which the reconstruction of the volume hologram 11 takes place in a reflection arrangement. In this embodiment too, the reference plane extends in 7b in the vertical direction and in the plane of the drawing 7b inside.

The device 10 includes as in the embodiment according to 1a and 1b three light sources 15th , whose light 16 on the volume hologram 11 hits to reconstruct it. In contrast to the 1a and 1b are in the embodiment according to 7a and 7b the light sources 15th in front of the volume hologram 11 arranged. The light sources 15th may like those of the embodiment according to 1a and 1b designed as light emitting diodes and at least partially in the middle in front of the volume hologram 11 be arranged (see 7b) be. There is definitely the possibility of more than three light sources 15th or just two light sources 15th to be provided.

The light sources 15th are spaced from one another and all arranged in a plane that is the reference plane 14th corresponds to or parallel to the reference plane 14th is. Preferably the light sources are 15th arranged side by side in one direction that is in the reference plane 14th or in one to the reference plane 14th parallel plane. Through the arrangement of the light sources 15th in the reference plane 14th or in one to the reference plane 14th parallel plane, the occurrence of undesired multiple reconstructions is reduced or prevented in the reflection arrangement.

At the in 8a and 8b The arrangement shown is in front of the light sources 15th an elongated aperture 19th arranged the the light sources 15th concealed for the viewer. The aperture 19th extends with its longitudinal direction in the X direction (see the Cartesian coordinate system in 8b) and accordingly points in the first direction X a significantly larger extent than in the second perpendicular direction Y on.

Instead of several light sources that are spaced apart from one another 15th For example, a single light source with an elongated light exit surface can also be provided.

In the 9a and 9b The arrangement shown also includes a device 10 for illuminating a volume hologram 11 with which the reconstruction of the volume hologram 11 takes place in a reflection arrangement. In contrast to 8a and 8b are in the embodiment according to 9a and 9b two rows of three light sources each 15th provided in terms of the orientation and nature of each row of light sources 15th according to 8a and 8b correspond. However, the two rows are light sources 15th not in the middle in front of the volume hologram 11 but rather laterally on the edges of the volume hologram in the positive and negative Y-direction 11 (please refer 9b) .

Instead of a single aperture 19th is a surrounding housing frame 20th provided that the two rows of light sources 15th concealed.

In this embodiment, instead of a plurality of mutually spaced light sources 15th For example, two individual light sources, each with an elongated light exit surface, can be provided per row.

A comparable arrangement is out 11a and 11b visible, but the reference plane 14th in 11b in the horizontal direction and in the plane of the drawing 11b extends into it. The two rows of light sources are accordingly 15th also horizontally in 11b arranged.

In the 10a and 10b depicted arrangement comprises a device 10 for lighting and three volume holograms 11 , the reconstruction of the volume holograms 11 also takes place in a reflection arrangement. The device 10 has three rows of light sources 15th on, side by side and each at least partially in the middle in front of one of the volume holograms 11 are arranged (see 10b) . The rows of light sources 15th can affect the orientation and nature of each row of light sources 15th according to 8a and 8b correspond. In front of each of the rows, as in the embodiment according to FIG 8a and 8b one aperture each 19th intended.

List of reference symbols

1

Volume hologram

2

optical axis of the volume hologram

3

Reference direction of the volume hologram

4th

Light source

α

Reference angle

10

Device for illuminating a volume hologram

11

Volume hologram

12

optical axis of the volume hologram

13

Reference direction of the volume hologram

14th

Reference plane of the volume hologram

15th

Light source

16

light emanating from the light source

17th

Light source

18th

Light exit surface

19th

cover

20th

Housing frame

X

first direction

Y

second direction

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

• WO 2010/076571 A1 [0002]

Claims (15)

Arrangement for illuminating a volume hologram (11), comprising - a volume hologram (11) which has an optical axis (12) and a reference direction (13), the reference angle (α) between the optical axis and the reference direction (13) not equal to 0 ° and not equal to 180 °, so that the optical axis (12) and the reference direction (13) span a reference plane (14), - a device (10) for illuminating a volume hologram (11) which has a plurality of light sources (15) has, from which light (16) emanates during operation of the device (10) which at least partially hits the volume hologram (11) in order to reconstruct it, characterized in that the light sources (15) in the reference plane (14) or in a plane parallel to the reference plane (14) are arranged. Arrangement according to Claim 1 , characterized in that the light sources (15) are designed as light emitting diodes (LED). Arrangement for illuminating a volume hologram, comprising - a volume hologram (11) which has an optical axis (12) and a reference direction (13), the reference angle (α) between the optical axis and the reference direction (13) not being equal to 0 ° and not being equal to 180 °, so that the optical axis (12) and the reference direction (13) span a reference plane (14), - a device (10) for illuminating a volume hologram (11), which has at least one light source (17) with a light exit surface ( 18) which has a greater extent in a first direction (X) than in a second direction (Y) perpendicular thereto, with light (16) emanating from the light exit surface (18) during operation of the device, which at least partially on the volume hologram (11) meets in order to reconstruct this, characterized in that the first direction (X) is arranged in the reference plane (14) or in a plane parallel to the reference plane (14). Arrangement according to Claim 3 , characterized in that the second direction (Y) is oriented perpendicular or almost perpendicular to the reference plane (14). Arrangement according to one of the Claims 3 or 4th , characterized in that the light exit surface (18) in the first direction (X) is greater than 5 mm, in particular greater than 10 mm, preferably greater than 20 mm. Arrangement according to one of the Claims 3 to 5 , characterized in that the light exit surface (18) in the second direction (Y) is smaller than 20 mm, in particular smaller than 10 mm, preferably smaller than 5 mm. Arrangement according to one of the Claims 3 to 6th , characterized in that the at least one light source (17) is designed as an organic light-emitting diode (OLED). Arrangement according to one of the Claims 3 to 6th , characterized in that the at least one light source (17) is designed as a two-line or multi-line LED matrix, the at least two lines of the LED matrix being arranged next to one another in the second direction (Y). Arrangement according to one of the Claims 1 to 8th , characterized in that the volume hologram (11) and the plurality of light sources (15) or the at least one light source (17) are arranged so that the reconstruction of the volume hologram (11) takes place in a reflection arrangement. Arrangement according to Claim 9 , characterized in that the device (10) comprises at least one screen (19) or at least one housing part, which at least partially conceals the at least one light source (17) or the plurality of light sources (15). Arrangement according to one of the Claims 1 to 8th , characterized in that the volume hologram (11) and the plurality of light sources (15) or the at least one light source (17) are arranged so that the reconstruction of the volume hologram (11) takes place in a transmission arrangement. Arrangement according to one of the Claims 1 to 11 , characterized in that at least one optical component is arranged between the volume hologram (11) and the at least one light source (17) or the plurality of light sources (15), for example as a diffuser or as TIR optics or as a microstructure or as a nanostructure or is designed as a light guide or comprises a diffuser or a TIR optic or a microstructure or a nanostructure or a light guide. Arrangement according to Claim 12 , characterized in that the optical component is an Edgelit light guide, in which light can be coupled out laterally and frontally, with the laterally coupled out light in particular striking the volume hologram (11) at least partially in order to apply it during operation of the device (10) reconstruct, whereas the frontally decoupled light serves a different light function. Arrangement according to one of the Claims 1 to 13 , characterized in that the volume hologram (11) is a computer-generated volume hologram (11). Lighting device for a motor vehicle, comprising an arrangement according to one of Claims 1 to 14th .

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