EP4251916A1 - Beleuchtungsvorrichtung für ein kraftfahrzeug - Google Patents
Beleuchtungsvorrichtung für ein kraftfahrzeugInfo
- Publication number
- EP4251916A1 EP4251916A1 EP21819778.8A EP21819778A EP4251916A1 EP 4251916 A1 EP4251916 A1 EP 4251916A1 EP 21819778 A EP21819778 A EP 21819778A EP 4251916 A1 EP4251916 A1 EP 4251916A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hologram
- lighting device
- light
- leg
- reflecting area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
- F21S43/235—Light guides
- F21S43/236—Light guides characterised by the shape of the light guide
- F21S43/241—Light guides characterised by the shape of the light guide of complex shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/50—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/24—Light guides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/50—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by aesthetic components not otherwise provided for, e.g. decorative trim, partition walls or covers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
- F21S43/235—Light guides
- F21S43/236—Light guides characterised by the shape of the light guide
- F21S43/239—Light guides characterised by the shape of the light guide plate-shaped
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
- F21S43/235—Light guides
- F21S43/242—Light guides characterised by the emission area
- F21S43/245—Light guides characterised by the emission area emitting light from one or more of its major surfaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/20—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by refractors, transparent cover plates, light guides or filters
- F21S43/235—Light guides
- F21S43/247—Light guides with a single light source being coupled into the light guide
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/30—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by reflectors
- F21S43/31—Optical layout thereof
- F21S43/315—Optical layout thereof using total internal reflection
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/32—Holograms used as optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
- G02B6/006—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to produce indicia, symbols, texts or the like
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/22—Processes or apparatus for obtaining an optical image from holograms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S43/00—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights
- F21S43/10—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source
- F21S43/13—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the light source characterised by the type of light source
- F21S43/14—Light emitting diodes [LED]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2223/00—Optical components
- G03H2223/16—Optical waveguide, e.g. optical fibre, rod
Definitions
- the present invention relates to a lighting device for a motor vehicle according to the preamble of claim 1.
- a lighting device of the type mentioned above is known from DE 102012 101 451 A1.
- the lighting device described therein comprises a light source designed as a light-emitting diode (LED), a light guide with an entry surface and a reflecting area, and a hologram arranged on the light guide.
- a light source designed as a light-emitting diode (LED)
- a light guide with an entry surface and a reflecting area and a hologram arranged on the light guide.
- a hologram arranged on the light guide.
- light emitted by the light source enters the entry surface of the light guide in the direction of the reflecting area and is reflected by this in the inner part of the light guide in the direction of the hologram.
- images stored in the hologram can be reconstructed or a desired light distribution in the exterior of the motor vehicle can be generated.
- the lighting devices mentioned in this document have comparatively short distances between the light source and the entry surface and between the entry surface and the reflecting area.
- the problem on which the present invention is based is the creation of an illumination device of the type mentioned at the outset, which enables the design of a narrow and wide light exit surface with simple means, the hologram arranged on the light guide being illuminated with as precise an angle as possible who is to.
- the average distance between the light source and the entry surface is at least half as large as the average distance between the reflective area and the hologram.
- the average distance between the light source and the entry surface together with the average distance between the entry surface and the reflecting area is between 0.8 and 1.2 times as large as the average distance between the reflecting area and the hologram.
- the extensive avoidance of these reflections can ensure clean, angle-exact illumination of the hologram.
- the large distance between the light source and the reflecting area results in a long distance over which the light emanating from the light source can expand in a transverse direction.
- a large width extension and a space-saving, compact design of the light guide can thus be made possible, so that it can also be easily integrated into small installation spaces for lights and headlights.
- the coupling path or the distance between the light source and the reflecting area can therefore be used with a corresponding divergence of the light emanating from the light source designed in particular as a light-emitting diode (LED) to spread the light over a large width of the reflecting area.
- LED light-emitting diode
- the extent of the reflective area in the first transverse direction is between 0.8 and 1.2 times the extent of the hologram in the first transverse direction, preferably approximately the same as the extent of the hologram in the first transverse direction is.
- the hologram can thus be optimally illuminated by the reflective area illuminated over its entire width, for example.
- the reflecting area can be convexly curved, in particular to be designed as a paraboloid surface. This ensures that the reflection forms a parallel bundle of light that illuminates the hologram at a defined angle.
- the reflecting area can also be designed as a free-form surface in order to enable further optimization of the illumination or to enable optimal adaptation to the light coupled in from the light-emitting diode.
- the reflective area can alternatively with be provided with additional optics depending on the desired light formation of the reflected light.
- the reflecting area can be mirrored because there is no total reflection at steep illumination angles.
- the light guide prefferably be designed in a V-shape with two legs and a connecting area between the two legs, with the entry surface being arranged on the first of the legs, the reflecting area being arranged on or in the connecting area and on or the hologram is arranged in the second of the legs.
- the entry surface can be arranged on the end of the first leg facing away from the connection area. This results in a front side formed by the second limb with the hologram, from which the light can emerge in the desired distribution, and a back side partially formed by the first limb, in front of and in which the light emanating from the light source propagates in the transverse direction can.
- the lighting device in the motor vehicle can be chosen such that the connection area is at the top and the ends of the legs that face away from the connection area are at the bottom.
- the lighting device can also be installed in reverse in the motor vehicle, so that the connection area is arranged at the bottom and the ends of the legs that are remote from the connection area are arranged at the top.
- the entry surface can be concavely curved, with the entry surface in particular having the shape of a partial hollow sphere.
- a neutral light entrance adapted to the divergence of the light emanating from the light source can be achieved.
- the edges of the entry surface adjacent to the front and rear surfaces of the first leg are rounded.
- the rounded edges are not only useful in terms of production technology, but also in terms of lighting technology, because they easily deflect light in the edge area so that it leaves the light guide or at least only slightly disturbs the angle-exact illumination of the hologram.
- the rounded edges can also be provided with a black coating or a black lacquer.
- the angle between the two legs is between 10° and 120°, preferably between 20° and 90°, in particular between 30° and 70°.
- the selected angle between the two legs of the light guide is defined by the illumination angle with which the hologram has to be illuminated in order to reconstruct the hologram. With a steep illumination angle of 50° to 80° from the perpendicular on the hologram, there is a narrow angle between the two legs of the light guide, which is advantageous for a compact design that does not require a great deal of overall depth. In the case of flat illumination angles of, for example, 20° to 40° from the perpendicular to the hologram, the angle between the two legs of the light guide becomes larger, so the light guide loses its compactness with regard to the overall depth.
- the lighting device includes a screen, preferably a blackened screen, which is arranged between the two legs.
- the aperture in black is important for a hologram in order to offer a high contrast to a black surface on the back for the reconstructed hologram or the holographic image.
- a film provided with a volume hologram, which is glued onto the second leg has a high degree of transparency because the holographic image can only be seen when illuminated. This allows the intermediate panel area to be used to show, for example, a graphic pattern or element, or a decorative element such as letters or text or symbols, or any other additional element.
- the panel can also be used as a holding element for the LED printed circuit board and the light guide are used to form an assembly or a module from all the components. It makes sense to provide a fastening geometry that is hidden behind a front-side decoupling surface arranged on the second leg and the intermediate screen, in order to be able to provide a series of several light guides in a lateral direction.
- the hologram is a transmission hologram, which is arranged in particular on the surface of the second leg facing away from the first leg.
- the transmission hologram can be in the form of a volume hologram stored in a foil, it being possible for the foil to be glued onto the surface of the second limb facing away from the first limb.
- the transmission hologram can be designed, for example, as an edge lithologram that is exposed at large angles.
- the hologram is a reflection hologram, which is arranged in particular on the surface of the second leg facing the first leg, preferably with the light guide having an exit surface on the side of the second leg opposite the reflection hologram.
- the reflection hologram can also be in the form of a volume hologram stored in a film, with the film being able to be glued onto the surface of the second limb facing the first limb.
- the reflection hologram can also be in the form of an edge lithologram that is exposed at large angles.
- the average distance between the entry surface and the reflecting area is at least half as large as the average distance from the reflecting area to the hologram and that at least one surface of the light guide is arranged between the entry surface and the reflecting area is provided with a coating or a paint, in particular is provided with a black coating or a black paint.
- the light guide can be V-shaped with two legs and a connecting area between the two legs, with the entry surface being arranged on the first of the legs, the reflecting area being arranged on or in the connecting area and the The hologram is arranged on the limb, the surface of the first limb facing away from the second limb and/or the surface of the first limb facing the second limb being provided with the coating or the lacquer.
- the coating or paint on the front surface and the rear surface of the first leg can reduce reflections on these surfaces or, ideally, completely avoid them. As a result, double images and blurring in the image generated by the hologram can also be reduced or avoided. Accordingly, the embodiment according to claim 14 can also ensure clean, angularly precise illumination of the hologram by largely avoiding these reflections.
- FIG. 1 shows a front view of a first embodiment of a lighting device according to the invention
- FIG. 2 shows a side view of the lighting device according to FIG. 1 ;
- FIG. 3 shows a rear view of the lighting device according to FIG. 1 ;
- FIG. 4 shows a perspective view of the lighting device according to FIG. 1;
- FIG. 5 shows a further perspective view of the lighting device according to FIG. 1;
- FIG. 6 shows a perspective view of several interconnected lighting devices according to FIG. 1;
- FIG. 7 shows a further perspective view of several lighting devices connected to one another according to FIG. 1;
- FIG. 8 shows a sectional view of a second embodiment of a lighting device according to the invention.
- FIG. 9 shows a rear view of the lighting device according to FIG. 8 with drawn beam paths of the light generated by the light source.
- FIG. 10 shows a side view of a lighting device not covered by the invention, with the beam paths of the light generated by the light source being drawn in;
- FIG. 11 shows a rear view of a third embodiment of a lighting device according to the invention.
- FIG. 12 shows a perspective view of the lighting device according to FIG. 11;
- FIG. 13 shows a perspective view of a detail of the lighting device according to FIG. 11;
- FIG. 14 shows a side view of the lighting device according to FIG. 11;
- FIG. 15 shows a side view of the lighting device according to FIG. 11 with drawn beam paths of the light generated by the light source
- Figure 16 shows a detail of Figure 15
- FIG. 17 shows a perspective view of a plurality of lighting devices according to FIG. 11 connected to one another;
- FIG. 18 shows a further perspective view of several lighting devices connected to one another according to FIG. 11;
- FIG. 19 is a front view of a fourth embodiment of a lighting device according to the present invention, showing a reconstruction of an image stored in a flolog of the embodiment;
- FIG. 20 is a front view of a fifth embodiment of a lighting device according to the present invention, showing a reconstruction of an image stored in a flolog of the embodiment;
- 21 is a front view of a sixth embodiment of a lighting device according to the present invention, showing a reconstruction of an image stored in a flolog of the embodiment;
- the first embodiment of a lighting device according to the invention shown in FIGS. 1 to 5 comprises a light source 1 embodied as a light-emitting diode (LED) which is arranged on a printed circuit board 2 .
- a light source 1 embodied as a light-emitting diode (LED) which is arranged on a printed circuit board 2 .
- LED light-emitting diode
- the lighting device further comprises a light guide 3 which has a substantially V-shaped cross section (see FIG. 2).
- the light guide 3 has a first leg 4, a second leg 5 and a connecting region 6 connecting the two legs 4, 5 ver.
- the first leg 4 has an entry surface 7 for the light emanating from the light source 1 at its end remote from the connecting region 6 (see FIG. 3). Starting from the entry surface 7, the first leg 4 widens in a V-shape in a corresponding transverse direction (see the direction from left to right in FIG. 3) until it reaches its greatest extent in the connection area 6. Through the V-shaped widening is achieved so that there is space for fastening elements 13 on the outer sides of the first leg 4, with which the light guide 3 can be fastened.
- the second leg 5 has an upper section 8 and a lower section 9 which is slightly angled relative to the upper section 8 .
- the lower section 9 of the second leg 5 forms, on its side facing away from the first leg 4, an exit surface onto which a hologram 10 in the form of a volume hologram read into a foil is applied, in particular glued, from the outside.
- the hologram 10 is a transmission hologram with which the light passing through from the exit surface can interact. With a correspondingly small angle a between the two legs 4, 5, the hologram is also an edge lithologram, because the illumination angle ß is then comparatively large at which the hologram 10 must be illuminated in order to reconstruct the holographic image (see Fig. 15 ).
- the reflection hologram can also be in the form of a volume hologram stored in a film, with the film being able to be glued onto the surface of the lower section 9 of the second leg 5 facing the first leg 4 .
- light emanating from the reflection hologram can emerge from the light conductor 3 through the exit surface formed on the side of the lower section 9 of the second leg 5 facing away from the first leg 4 .
- the reflection hologram can also be designed as an edge lithologram that is illuminated at large angles.
- the connecting area 6 is mostly provided with a reflective coating on the outside and thus serves as a reflective area 11. Accordingly, light 12 emanating from the light source 1 and entering the light guide 3 through the entry surface 7 passes through the first leg 4, impinges on the reflective area 11 and reflects it downwards in FIG. 2 into the second leg 5. In the second leg 5, the light passes through the exit surface of the lower section 9 of the second leg 5 and into the hologram 10.
- the reflecting area 11 is convexly curved and, in particular, is designed as a paraboloid surface. What is achieved by this curvature is that the portions of the light 12 striking the reflecting area 11 at different angles are reflected essentially in the same direction downwards in FIG. 9 .
- the essentially mutually parallel light beams of the light 12 ensure essentially the same illumination angle ⁇ of the hologram 10, which is advantageous for an effective reconstruction of the holographic image.
- the reflecting area 11 is designed as a free-form surface in order to enable further optimization of the illumination or to enable optimal adaptation to the coupled-in light 12 of the light source 1 .
- the reflective area 11 can alternatively be provided with additional optics depending on the desired light shaping of the reflected light 12.
- FIGS. 2 and 3 show that the average distance between the entry surface 7 and the reflecting area 11 is essentially as large as the average distance from the reflecting surface 11 to the hologram 10 .
- the first leg 4 Due to the comparatively large distance between the entrance surface 7 and the reflecting area 11, the first leg 4 can be used effectively as a coupling path, on which the light 12 can expand in the transverse direction over the entire width of the reflecting area 11 (see Fig. 9). .
- the width of the reflecting area 11 essentially corresponds to the width of the hologram 10, the hologram 10 can be uniformly illuminated with a single light-emitting diode.
- Fig. 8 shows a second embodiment of a lighting device in which between the two legs 4, 5's a diaphragm 14 is provided.
- the panel 14 can be blackened in particular on its side facing the second leg.
- the aperture 14 in black is important in order to offer a high contrast to a black surface on the back for the reconstructed hologram or the holographic image.
- the intermediate panel area can be used to show, for example, a graphic pattern or element, or a decorative element such as letters or text or symbols, or any other additional element.
- the aperture 14 can also serve as a holding element for the printed circuit board 2 and the light guide 3 in order to form an assembly or a module from all the components.
- the fastening elements 13 shown in FIG. 3 can be screwed to the panel.
- FIGS. 6 and 7 make it clear that a plurality of the lighting devices can be arranged next to one another on a common mount 15 .
- this version offers the possibility of positioning several lighting devices next to one another for a greater width extension of the appearance and thus adapting the illuminated area or the size of the holographic image, composed of several individual images, in relation to the narrow and elongated luminaire version.
- the front surface 4a and the rear surface 4b of the first leg 4 are coated with an absorbent coating or are provided with an absorbing lacquer, not shown.
- This coating or this paint can be black in particular.
- the coating or the paint prevents reflections of the coupled-in light 12 on the front and rear surfaces 4a, 4b of the first leg 4.
- 10 illustrates the extent to which such reflections can lead to an illumination of the hologram 10 at different angles using an illumination device that has no absorbent coating and no absorbent lacquer on the front and/or rear surface 4a, 4b of the first leg 4 . It can be seen that light beams 12a, 12b reflected from the front surface 4a or the rear surface 4b of the first leg 4 impinge on the hologram 10 at significantly different angles than light 12 that travels directly from the entry surface 7 to the reflecting area 11 has spread. This can lead to double images and blurring in the image generated by the hologram 10 .
- the coating or the lacquer on the front surface 4a and the rear surface 4b of the first leg 4 can reduce or ideally completely avoid reflections on the front surface 4a or the rear surface 4b of the first leg 4 .
- double images and blurring in the image generated by the hologram 10 can also be reduced or avoided.
- a disadvantage of the coating or the painting is the additional manufacturing process for each light guide 3 with corresponding costs.
- Another disadvantage is the need for a sensible subsequent storage and transport device for the coated light guides 3, so that the coating or paint is not damaged during further assembly.
- the narrow space between the legs 4, 5 can mean that a coating process or painting process cannot usually take place optimally up to the upper narrow area of the inverted V and thus the effect of the coating or painting does not have the desired optimal effect achieved.
- the third embodiment shown in FIGS. 11 to 18 therefore differs from the first two in that the first leg 4 is designed to be significantly shorter.
- the entry surface 7 is now arranged next to and to a large extent even above the two fastening elements 13 (see FIG. 12).
- the coupling takes place closer to the reflecting area 11 of the light guide 3, so that there are virtually no disruptive reflections on the front surface 4a and the rear surface 4b of the first leg 4.
- no light 12 emanating from the light source 1 can penetrate directly into the second leg 5 because the second leg 5 of the light guide 3 is covered by the screen 14 (see FIG. 14).
- the result is clean, angularly precise illumination of the hologram 10.
- the angularly precise illumination can be clearly seen from the beam path of the light 12 shown in FIG essentially enclose the same angle ß.
- the entry surface 7 is concavely curved and has in particular the shape of a partial hollow sphere (see in particular FIG. 13), whereby a neutral light entry matched to the divergence of the light 12 emanating from the light source 1 is achieved.
- 16 makes it clear that the edges 7a, 7b of the entry surface 7 adjoining the front and the rear surface 4a, 4b of the first leg 4 are rounded.
- the rounded edges 7a, 7b are not only useful in terms of production technology, but also in terms of lighting technology, because they easily deflect light 12 in the edge area. This applies in particular to the rear edge 7b, which prevents light from being able to impinge on the rear surface 4b of the first leg 4, which is arranged above the entry surface 7.
- the deflected light is largely aligned in such a way that it leaves the light guide 3 or appears very little as interfering light for the hologram 10 .
- the length of the beam path required for expanding the light 12 to the width of the reflecting area 11 is created on the way from the light source 1 to the entry surface 7 .
- the average distance di between the light source 1 and the entry surface 7 corresponds to more than half the average distance d2 between the reflecting area 11 and the hologram 10 (see FIG. 14).
- the average distance di between the light source 1 and the entrance surface 7 together with the average distance d3 between the entrance surface 7 and the reflecting area 11 is between 0.8 and 1.2 times as large, preferably about the same as that average distance d2 between the reflecting area 11 and the hologram 10.
- the third embodiment offers further advantages over the first two embodiments.
- the entire light guide 3 is more compact, so that material is saved and an injection molding process used to produce the light guide 3 can be controlled better than with a larger light guide.
- the deeply incising V-contour is omitted.
- FIG. 17 and 18 make it clear that a plurality of third embodiments of the lighting device can also be arranged next to one another. Any objects and geometries can be provided as the holographic image generated by the hologram 10 .
- Figures 19 to 21 illustrate some examples of the holographic image 16 produced. The examples of a holographic implementation show a letter 17 and a background pattern 18 and a ground pattern, respectively. Furthermore, Fig. 20 and Fig. 21 also show a lateral offset
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
- Planar Illumination Modules (AREA)
- Arrangements Of Lighting Devices For Vehicle Interiors, Mounting And Supporting Thereof, Circuits Therefore (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020131627.5A DE102020131627A1 (de) | 2020-11-30 | 2020-11-30 | Beleuchtungsvorrichtung für ein Kraftfahrzeug |
| PCT/EP2021/082689 WO2022112249A1 (de) | 2020-11-30 | 2021-11-23 | Beleuchtungsvorrichtung für ein kraftfahrzeug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4251916A1 true EP4251916A1 (de) | 2023-10-04 |
Family
ID=78821945
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21819778.8A Pending EP4251916A1 (de) | 2020-11-30 | 2021-11-23 | Beleuchtungsvorrichtung für ein kraftfahrzeug |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US12158253B2 (de) |
| EP (1) | EP4251916A1 (de) |
| CN (1) | CN116670428A (de) |
| DE (1) | DE102020131627A1 (de) |
| WO (1) | WO2022112249A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021207574A1 (de) * | 2021-07-15 | 2023-01-19 | Carl Zeiss Jena Gmbh | Holographische beleuchtungseinrichtung |
| DE102022100799A1 (de) | 2022-01-14 | 2023-07-20 | HELLA GmbH & Co. KGaA | Beleuchtungsvorrichtung für ein Kraftfahrzeug |
| DE102022131471A1 (de) | 2022-11-29 | 2024-05-29 | HELLA GmbH & Co. KGaA | Holografische Beleuchtungsvorrichtung für Fahrzeuge |
| US12331901B1 (en) * | 2024-03-11 | 2025-06-17 | Valeo Vision | Light system with a thick lens having a body portion, waterfall portion, and display mechanism |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012C (de) | ||||
| US5101193A (en) * | 1990-04-16 | 1992-03-31 | Hughes Aircraft Company | Universal stand-alone holographic center high mounted stoplight |
| JPH07192510A (ja) * | 1993-12-24 | 1995-07-28 | Nissan Motor Co Ltd | 車両用灯具 |
| US5857770A (en) * | 1997-03-24 | 1999-01-12 | Ford Motor Company | Laser illuminated vehicle lighting system utilizing a turning prism |
| DE102012100206A1 (de) * | 2012-01-11 | 2013-07-11 | Seereal Technologies S.A. | Optische Vorrichtung zum Beleuchten einer Pixelmatrix oder eines steuerbaren räumlichen Lichtmodulators eines Displays |
| DE102012101451B4 (de) | 2012-02-23 | 2023-12-14 | HELLA GmbH & Co. KGaA | Beleuchtungsvorrichtung für Fahrzeuge |
| JP6659348B2 (ja) * | 2015-12-18 | 2020-03-04 | スタンレー電気株式会社 | ウインドウリアランプ |
| DE102017109314A1 (de) * | 2017-05-02 | 2018-11-08 | HELLA GmbH & Co. KGaA | Beleuchtungsvorrichtung für Fahrzeuge |
| DE102017109331A1 (de) * | 2017-05-02 | 2018-11-08 | HELLA GmbH & Co. KGaA | Beleuchtungsvorrichtung für Fahrzeuge |
| DE102017124296A1 (de) * | 2017-10-18 | 2019-04-18 | Carl Zeiss Jena Gmbh | Leuchteinrichtung für Fahrzeuge |
| GB2585687B (en) * | 2019-07-11 | 2021-08-18 | Dyson Technology Ltd | Vehicle lamps |
-
2020
- 2020-11-30 DE DE102020131627.5A patent/DE102020131627A1/de active Pending
-
2021
- 2021-11-23 WO PCT/EP2021/082689 patent/WO2022112249A1/de not_active Ceased
- 2021-11-23 CN CN202180080283.3A patent/CN116670428A/zh active Pending
- 2021-11-23 EP EP21819778.8A patent/EP4251916A1/de active Pending
-
2023
- 2023-05-30 US US18/325,656 patent/US12158253B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| US12158253B2 (en) | 2024-12-03 |
| DE102020131627A1 (de) | 2022-06-02 |
| US20230304643A1 (en) | 2023-09-28 |
| CN116670428A (zh) | 2023-08-29 |
| WO2022112249A1 (de) | 2022-06-02 |
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