EP4025827B1 - Lighting device for a motor vehicle headlight - Google Patents
Lighting device for a motor vehicle headlight Download PDFInfo
- Publication number
- EP4025827B1 EP4025827B1 EP20753367.0A EP20753367A EP4025827B1 EP 4025827 B1 EP4025827 B1 EP 4025827B1 EP 20753367 A EP20753367 A EP 20753367A EP 4025827 B1 EP4025827 B1 EP 4025827B1
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- EP
- European Patent Office
- Prior art keywords
- light
- optical element
- collimator
- illumination
- module
- 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.)
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- 230000003287 optical effect Effects 0.000 claims description 109
- 238000005286 illumination Methods 0.000 claims description 54
- 238000010168 coupling process Methods 0.000 claims description 53
- 238000005859 coupling reaction Methods 0.000 claims description 53
- 230000008878 coupling Effects 0.000 claims description 48
- 238000009826 distribution Methods 0.000 claims description 27
- 230000001154 acute effect Effects 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims 1
- 239000003086 colorant Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
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
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
-
- 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
- F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
-
- 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
- F21S41/25—Projection lenses
- F21S41/275—Lens surfaces, e.g. coatings or surface structures
-
- 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
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/322—Optical layout thereof the reflector using total internal reflection
-
- 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
- F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
- F21S41/63—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates
- F21S41/635—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on refractors, filters or transparent cover plates by moving refractors, filters or transparent cover plates
-
- 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
- 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
- F21S43/26—Refractors, transparent cover plates, light guides or filters not provided in groups F21S43/235 - F21S43/255
-
- 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
-
- 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
- F21S43/40—Signalling devices specially adapted for vehicle exteriors, e.g. brake lamps, direction indicator lights or reversing lights characterised by the combination of reflectors and refractors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2103/00—Exterior vehicle lighting devices for signalling purposes
- F21W2103/55—Daytime running lights [DRL]
Definitions
- Numerous lighting devices for motor vehicle headlights are known from the prior art (see for example CH 296 715 A and WO 2017/066817 A ).
- the disadvantage is that lighting devices in which light is emitted over a relatively large area do not achieve a homogeneous luminous impression. This is due to the spatially inhomogeneous light intensity of the light sources.
- scattering lenses were attached after a collimator, for example. However, these are very heavy and do not achieve the legally required light values, which are required for lighting devices in the area of motor vehicle headlights.
- the object of the present invention is to alleviate or eliminate the disadvantages of the prior art.
- the invention therefore aims in particular to create a lighting device in which the homogenization of the luminous impression is further improved.
- the light exit surface of the collimator is formed from a large number of lenses, which are preferably arranged in a uniform grid over the entire light exit surface of the collimator, with each lens being set up to emit the light of the illuminant divergently onto the light coupling surface of the optical element, so that each the multiplicity of lenses illuminates the light in-coupling surface of the optics element, all lenses having essentially the same focal length, the collimator and the optics element being spaced apart from one another, the distance essentially corresponding to the focal length of the lenses.
- the light from the light source is scattered onto the light input surface by all lenses which are arranged on the light exit surface of the collimator, whereby the light input surface of the optical element is particularly evenly illuminated per unit area.
- the light intensity at the light in-coupling surface of the optical element per unit area is essentially constant.
- the lenses are preferably designed as diffusing lenses and are formed in one piece with the collimator.
- the light radiated divergently by each lens strikes the light coupling surface of the optical element and is coupled into the optical system via the Fresnel lens.
- the weight of the optical element can be reduced by using a Fresnel lens.
- the light beams run parallel within the optical element and are scattered by the optical elements on the light output surface when they exit the optical system. A particularly homogeneous luminous impression can thus be achieved on the light output surface.
- the light output surface has a uniform brightness per unit area.
- the optical element can be designed in the form of a plate, it being possible for the plate-shaped optical element to be curved or planar. With this, a special low weight can be achieved.
- the width of the plate which corresponds to the extent of the plate in the direction of light propagation, can be between 5 mm and 15 mm.
- the length of the plate can be between 20 mm and 50 mm.
- the height of the plate can be between 20mm and 50mm.
- Each of the plurality of lenses preferably illuminates the light coupling surface of the optical element completely, as a result of which the illumination of the light coupling surface is composed of a superimposition of the light emitted by all the lenses.
- the light exiting from an individual lens is essentially completely superimposed on the light coupling surface with the light exiting from all other lenses.
- the light intensity at the light coupling surface of the optics element per unit area is thus advantageously essentially constant or of the same magnitude. In other words, the differences in intensity of the light emitted by the lighting means are compensated or evened out by the superimposition of the light emitted by each lens.
- each lens has the same dimensions and/or optical properties.
- each lens is 0.2mm to 5mm, preferably 0.6mm to 3mm, most preferably 1mm to 2mm.
- the entire light exit surface can be formed from a large number of lenses. This advantageously leads to a superimposition of a large number of light bundles, which in turn improves the uniform illumination of the light coupling surface of the optical element.
- the collimator can be conically shaped and have an opening angle of, for example, 25° to 30°.
- the light exit surface of the collimator is smaller than the light coupling surface of the optical element.
- the overall size of the lighting device can be reduced by a collimator that is small relative to the optical element.
- the light exit surface of the collimator can be connected to the light coupling surface of the optics element in such a way be spaced and arranged so that the light emerging from each lens exclusively illuminates the light coupling surface of the optical element completely or exactly.
- the individual lenses are preferably calculated by a person skilled in the art in such a way that, at a distance from the lenses which corresponds to the focal length of the lenses, each lens is illuminated on an area of the same size, which corresponds to the light in-coupling area of the optical element.
- the lighting device can have a first and a second light module, with the first light module preferably illuminating a first partial area of the light coupling surface, and the second light module illuminating a second partial surface of the light coupling surface, with the first and the second partial surface each forming one half of the light coupling surface, for example.
- the first and the second light module can, for example, have illuminants with different colors, as a result of which light of different colors can advantageously be emitted via the light coupling-out surface of the optical system.
- the first and the second light module can also each illuminate the entire light coupling surface of the optical system, preferably completely or over the entire surface.
- the lighting device can also include three or more light modules.
- the first and the second partial surface can in particular be illuminated by the respective light module without overlapping.
- an illumination system comprising an illumination device according to the invention and an illumination unit, the illumination unit being set up to generate light and emit it along a light emission direction, with the light emission direction being aimed at the focal plane of the lenses of the collimator of the light module, the illumination system having an adjustment device comprises, with which the optical element of the lighting device can be transferred between a first and a second position, wherein in the first position the optical element is arranged in such a way that the light emitted by the at least one light module of the lighting device impinges on the light coupling surface of the optical element, wherein in the second position, the optical element is arranged in such a way that no light emitted by the at least one light module of the lighting device impinges on the light coupling surface of the optical element and that Optical element is outside the light emission direction of the light that can be emitted by the lighting unit.
- the entire lighting device or the lighting unit of the lighting system does not have to be adjusted between two positions, but only the optical system.
- smaller, less powerful adjustment devices such as a linear drive or a servomotor, can be used.
- the optics system can, for example, be adjustably fastened to one or more guide rails.
- the optical element can also be pivoted about a pivot axis with the adjustment device, the optical system being in the pivoted state outside the light propagation direction of the at least one light module of the lighting device and outside the light emission direction of the lighting unit.
- the light module of the lighting device and the lighting unit can be arranged relative to one another in such a way that the light propagation direction of the collimator of the light module and the light emission direction of the lighting unit have an acute angle to one another.
- the light propagation direction of the collimator of the light module and the light emission direction of the lighting unit preferably have an intersection point, with the intersection point lying in the focal plane of the lenses of the collimator.
- the light module of the lighting device and the lighting unit are positioned relative to one another in such a way that the light propagation direction and the light emission direction are each directed onto the light coupling surface of the optical element.
- the at least one light module of the lighting device can be in an active state, in which Light is emitted from the at least one light module onto the light coupling surface, with the lighting unit being in an inactive state while the lighting device is in the active state, in which the lighting unit does not emit any light.
- the lighting unit When the optical element is in the second position, the lighting unit can be in an active state, in which light is emitted from the lighting unit as a light beam, with the at least one light module of the lighting device being in the active state while the lighting unit is in is in an inactive state in which the at least one light module does not emit any light.
- the lighting system can generate a first light distribution when the optical element is in the first position and the at least one light module of the lighting device is in an active state, and generate a second light distribution when the optical element is in the second position and the lighting unit is in is an active state, preferably wherein the first and second light distributions are different.
- the first light distribution preferably comprises a light distribution of a daytime running light or a signal light function
- the second light distribution comprises a low-beam light distribution or a high-beam light distribution.
- the light module of the lighting device can be active and the optical element can be in the first position.
- the light module of the lighting device in particular can be brought into an inactive state, with the lighting unit being brought into an active state, in particular essentially at the same time, and the optical system being moved from the first to the second position . This means that the transition from different light functions or light distributions can be carried out quickly and easily.
- the lighting device and/or the lighting unit preferably each have a lighting means which is set up to generate white and/or colored light.
- the lighting device can advantageously provide, for example, colored light for a signal light function and the lighting unit can provide essentially white light for a low beam or high beam.
- top, bottom, horizontal, vertical are to be understood as indications of the orientation when the lighting device or the lighting system is arranged in the normal use position after it or it is in an im Motor vehicle headlight was installed.
- the Figures 1-3 show different views of a lighting device 1 for a motor vehicle headlight with two light modules 2, wherein the light modules 2 each have a light source 2a and a collimator 3.
- the light modules 2 are preferably identical in construction.
- An embodiment with a light module 2 is in 4 shown.
- the collimator 3 is set up so that the light generated by the illuminant 2a is emitted via a light exit surface 3a of the collimator 3 as a divergent light beam in a light propagation direction 4 (see Fig. Figures 4-5 ) exit.
- the collimator 3 is conically shaped and has an opening angle ⁇ of 25° to 30° (see Fig 2 ).
- the lighting device also includes an optical element 5 which is arranged after the collimator 3 in the direction of light propagation 4 .
- the optical element 5 has a light coupling surface 5a and a light coupling surface 5b, the light from the collimator 3 hitting the light coupling surface 5a, being guided through the optical element 5 to the light coupling surface 5b, and exiting the optical element 5 at the light coupling surface 5b.
- the light in-coupling surface 5a has Fresnel optics, which are set up to break the light beams when they enter the optics element 5 in such a way that the light beams propagate parallel to one another within the optics element 5 .
- the light decoupling surface 5b of the optical element 5 has a multiplicity of optical elements 6, each optical element 6 being designed and set up in such a way that the light emerges from each optical element 6 as a divergent light beam (see Fig. Figures 4-5 ).
- the light exit surface 3a of the collimator 3 is formed from a multiplicity of lenses 7 .
- the lenses 7 are arranged in a uniform grid over the entire light exit surface 3 of the collimator 3 .
- Each lens 7 is set up to radiate the light of the illuminant 2a divergently onto the light coupling surface 5a of the optics element 5 , so that each of the plurality of lenses 7 illuminates the light coupling surface 5a of the optics element 5 .
- All lenses 7 have essentially the same focal length, with the distance between the collimator 3 and the optical element 5 essentially corresponds to the focal length of the lenses 7 .
- the optics element 5 is planar or even and plate-shaped, with the optics element 5 also being able to be embodied as a curved plate.
- Each of the plurality of lenses 7 completely illuminates the light coupling surface 5a of the optics element 5 .
- the illumination of the light coupling surface 5a is composed of a superimposition of the light emitted by all lenses 7 .
- Each lens 7 has the same dimensions and/or optical properties.
- the diameter of each lens 7 is 0.2 mm to 5 mm, preferably 0.6 mm to 3 mm, particularly preferably 1 mm to 2 mm.
- the light exit surface 3a of the collimator 3 is smaller than the light coupling surface 5a of the optical element 5.
- the light exit surface 3a of the collimator 3 is at a distance from the light coupling surface 5a of the optical element 5, with the light emerging from each lens 7 only completely or .precisely illuminated. In particular, no light rays run laterally or beyond an edge of the optical element 5 .
- the lenses 7 of the light exit surface 3a are thus calculated for the size of the light coupling surface 5a.
- the collimator 3 illuminates the entire light coupling surface 5a.
- the first light module 2 illuminates a first partial surface of the light coupling surface 5a and the second light module 2 illuminates a second partial surface of the light coupling surface 5a, with the first and second partial surfaces each forming one half of the light coupling surface 5a, for example.
- the first and second partial areas are preferably illuminated without overlapping.
- the beam path of the light beams between the collimator 3 and the optical element 5 and after the optical element 5 is shown schematically, with only the two outer and one central light beam being shown.
- the Fresnel optics of the light coupling surface 5a has a structure which compensates for the angle between the collimators 3 and the light coupling surface 5a, so that all light beams within the optics element are directed in parallel.
- FIG. 1 shows an illumination system 8 with an illumination device 1 and an illumination unit 9.
- the illumination unit 9 is set up to generate light and to emit it along a light emission direction 10.
- the light emission direction 10 is directed towards the focal plane of the lenses 7 of the collimator 3 of the light module 2 or towards the optics element 5 if this is in a first position (see Fig. 6 ) is arranged.
- the lighting system 8 includes an adjustment device 11 with which the optical element 5 can be transferred between the first and a second position. The second position is in 7 shown. In the first position, the light emitted by the collimator 3 of the illumination device 1 strikes the light coupling surface 5a of the optics element 5.
- the illumination unit 9 is inactive at this point in time and does not emit any light, this being indicated by the dashed lines.
- the optical element In the second position, the optical element is outside the light propagation direction 4 of the collimator 3 and also outside the light emission direction 10 of the lighting unit 9. The light from the lighting unit 9 can thus be emitted unhindered, for example onto a roadway.
- the light module 2 of the lighting device 1 and the lighting unit 9 are arranged relative to one another such that the light propagation direction 4 of the collimator 3 of the light module 2 and the light emission direction 10 of the lighting unit 9 have an acute angle to one another.
- the light propagation direction 4 and the light emission direction 10 have a point of intersection which lies in the focal plane of the lenses 7 of the collimator 3 .
- the light module 2 of the lighting device 1 When the optical element 5 is in the first position, the light module 2 of the lighting device 1 is in an active state, in which light is emitted from the light module 2 onto the light coupling surface 5a. At this time, the lighting unit 9 is in an inactive state in which the lighting unit 9 does not emit light.
- the lighting unit 9 is in an active state in which light is emitted from the lighting unit 9 as a light beam.
- the light module 2 of the lighting device 1 is in an inactive state in which the light module 2 does not emit any light. This is indicated by the dashed lines in 7 implied.
- the first position of the optical element 5 is in 7 also indicated as a dashed line.
- the lighting system 8 can generate a first light distribution when the optical element 5 is in the first position and the at least one light module 2 of the lighting device 1 is in an active state. Furthermore, a second light distribution can be generated when the optical element 5 is in the second position and the lighting unit 9 is in an active state.
- the first light distribution is, for example, a light distribution of a daytime running light or a signal light function
- the second light distribution is, for example, a low beam distribution or a high beam distribution. Accordingly, it is possible to switch between different light distributions, depending on the position in which the optical element 5 is.
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Optics & Photonics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Description
Die Erfindung betrifft eine Beleuchtungsvorrichtung für einen Kraftfahrzeugscheinwerfer, umfassend:
- zumindest ein Lichtmodul, wobei das Lichtmodul ein Leuchtmittel und einen dem Leuchtmittel zugeordneten Kollimator umfasst, wobei das Leuchtmittel Licht erzeugt und in den Kollimator einkoppelt, wobei der Kollimator dazu eingerichtet ist, dass das von dem Leuchtmittel erzeugte Licht über eine Lichtaustrittsfläche des Kollimators als divergentes Lichtbündel in einer Lichtausbreitungsrichtung austritt,
- ein Optikelement, welches in Lichtausbreitungsrichtung nach dem Kollimator angeordnet ist, mit einer Lichteinkoppelfläche und einer Lichtauskoppelfläche, wobei das Licht, welches aus dem Kollimator austritt, auf die Lichteinkoppelfläche des Optikelements trifft, durch das Optikelement an die Lichtauskoppelfläche des Optikelements geleitet wird, und an der Lichtauskoppelfläche aus dem Optikelement austritt, wobei die Lichteinkoppelfläche des Optikelements eine Fresneloptik aufweist, wobei die Fresneloptik dazu eingerichtet ist, die Lichtstrahlen beim Eintritt in das Optikelement derart zu brechen, dass sich die Lichtstrahlen innerhalb des Optikelements parallel zu einander ausbreiten, wobei die Lichtauskoppelfläche des Optikelements eine Vielzahl von optischen Elementen aufweist, wobei jedes optische Element jeweils derart ausgestaltet und eingerichtet ist, dass das Licht aus jedem optischen Element als, vorzugsweise divergentes, Lichtbündel austritt. Die Erfindung betrifft ferner ein Beleuchtungssystem.
- at least one light module, wherein the light module comprises a light source and a collimator assigned to the light source, the light source generating light and coupling it into the collimator, the collimator being set up to emit the light generated by the light source via a light exit surface of the collimator as a divergent light beam exits in a direction of light propagation,
- an optical element, which is arranged downstream of the collimator in the direction of light propagation, with a light coupling surface and a light coupling-out surface, the light exiting the collimator hitting the light coupling-in surface of the optical element, being guided through the optical element to the light coupling-off surface of the optical element, and on the Light coupling-out surface emerges from the optical element, the light coupling-in surface of the optical element having Fresnel optics, the Fresnel optics being set up to break the light beams when they enter the optical element in such a way that the light beams propagate parallel to one another within the optical element, the light coupling-out surface of the optical element has a multiplicity of optical elements, each optical element being designed and set up in such a way that the light emerges from each optical element as a, preferably divergent, light beam. The invention also relates to a lighting system.
Aus dem Stand der Technik sind zahlreiche Beleuchtungsvorrichtungen für Kraftfahrzeugscheinwerfer bekannt (siehe zum Beispiel
Die Aufgabe der vorliegenden Erfindung besteht darin, die Nachteile des Standes der Technik zu lindern bzw. zu beseitigen. Die Erfindung setzt sich daher insbesondere zum Ziel, eine Beleuchtungsvorrichtung zu schaffen, bei welcher die Homogenisierung des Leuchteindrucks weiter verbessert wird.The object of the present invention is to alleviate or eliminate the disadvantages of the prior art. The invention therefore aims in particular to create a lighting device in which the homogenization of the luminous impression is further improved.
Diese Aufgabe wird durch eine Beleuchtungsvorrichtung mit den Merkmalen von Anspruch 1 gelöst. Bevorzugte Ausführungen sind in den abhängigen Ansprüchen angegeben.This object is achieved by a lighting device having the features of
Erfindungsgemäß ist die Lichtaustrittsfläche des Kollimators aus einer Vielzahl von Linsen gebildet ist, welche vorzugsweise in einem gleichmäßigen Raster auf der gesamten Lichtaustrittsfläche des Kollimators angeordnet sind, wobei jede Linse dazu eingerichtet ist, das Licht des Leuchtmittels auf die Lichteinkoppelfläche des Optikelements divergent abzustrahlen, sodass jede der Vielzahl von Linsen jeweils die Lichteinkoppelfläche des Optikelements beleuchtet, wobei alle Linsen im Wesentlichen die gleiche Brennweite aufweisen, wobei der Kollimator und das Optikelement zueinander beabstandet sind, wobei der Abstand im Wesentlichen der Brennweite der Linsen entspricht.According to the invention, the light exit surface of the collimator is formed from a large number of lenses, which are preferably arranged in a uniform grid over the entire light exit surface of the collimator, with each lens being set up to emit the light of the illuminant divergently onto the light coupling surface of the optical element, so that each the multiplicity of lenses illuminates the light in-coupling surface of the optics element, all lenses having essentially the same focal length, the collimator and the optics element being spaced apart from one another, the distance essentially corresponding to the focal length of the lenses.
Dadurch ergibt sich der Vorteil, dass das Licht der Lichtquelle durch alle Linsen, welche auf der Lichtaustrittsfläche des Kollimators angeordnet sind, auf die Lichteinkoppelfläche gestreut wird, wodurch die Lichteinkoppelfläche des Optikelements pro Flächeneinheit besonders gleichmäßig beleuchtet wird. Insbesondere ist die Lichtintensität an der Lichteinkoppelfläche des Optikelements pro Flächeneinheit im Wesentlichen konstant. Die Linsen sind vorzugsweise als Streulinsen ausgebildet und einteilig mit dem Kollimator gebildet. Das von jeder Linse jeweils divergent abgestrahlte Licht trifft auf die Lichteinkoppelfläche des Optikelements und wird über die Fresneloptik in das Optiksystem eingekoppelt. Vorteilhafterweise kann durch die Verwendung einer Fresneloptik das Gewicht des Optikelements reduziert werden. Innerhalb des Optikelements verlaufen die Lichtstrahlen parallel und werden beim Austritt aus dem Optiksystem durch die optischen Elemente an der Lichtauskoppelfläche gestreut. Damit kann ein besonders homogener Leuchteindruck an der Lichtauskoppelfläche erreicht werden. Mit anderen Worten weist die Lichtauskoppelfläche eine pro Flächeneinheit gleichmäßige Helligkeit auf.This has the advantage that the light from the light source is scattered onto the light input surface by all lenses which are arranged on the light exit surface of the collimator, whereby the light input surface of the optical element is particularly evenly illuminated per unit area. In particular, the light intensity at the light in-coupling surface of the optical element per unit area is essentially constant. The lenses are preferably designed as diffusing lenses and are formed in one piece with the collimator. The light radiated divergently by each lens strikes the light coupling surface of the optical element and is coupled into the optical system via the Fresnel lens. Advantageously, the weight of the optical element can be reduced by using a Fresnel lens. The light beams run parallel within the optical element and are scattered by the optical elements on the light output surface when they exit the optical system. A particularly homogeneous luminous impression can thus be achieved on the light output surface. In other words, the light output surface has a uniform brightness per unit area.
Das Optikelement kann plattenförmig ausgestaltet sein, wobei das plattenförmige Optikelement gekrümmt oder plan ausgebildet sein kann. Damit kann ein besonders niedriges Gewicht erreicht werden. Die Breite der Platte, die der Ausdehnung der Platte in Lichtausbreitungsrichtung entspricht, kann zwischen 5 mm und 15 mm liegen. Die Länge der Platte kann zwischen 20 mm und 50 mm liegen. Die Höhe der Platte kann zwischen 20 mm und 50 mm liegen.The optical element can be designed in the form of a plate, it being possible for the plate-shaped optical element to be curved or planar. With this, a special low weight can be achieved. The width of the plate, which corresponds to the extent of the plate in the direction of light propagation, can be between 5 mm and 15 mm. The length of the plate can be between 20 mm and 50 mm. The height of the plate can be between 20mm and 50mm.
Bevorzugt beleuchtet jede der Vielzahl von Linsen die Lichteinkoppelfläche des Optikelements vollständig, wodurch sich die Beleuchtung der Lichteinkoppelfläche aus einer Überlagerung des von allen Linsen abgestrahlten Lichts zusammensetzt. Vorzugsweise überlagert sich das aus einer einzelnen Linse austretende Licht an der Lichteinkoppelfläche im Wesentlichen vollständig mit dem aus allen anderen Linsen austretenden Licht. Damit ist vorteilhafterweise die Lichtintensität an der Lichteinkoppelfläche des Optikelements pro Flächeneinheit im Wesentlichen konstant bzw. gleich groß. Mit anderen Worten werden die Intensitätsunterschiede des von dem Leuchtmittel emittierten Lichts durch die Überlagerung des von jeder Linse abgestrahlten Lichts kompensiert bzw. ausgeglichen.Each of the plurality of lenses preferably illuminates the light coupling surface of the optical element completely, as a result of which the illumination of the light coupling surface is composed of a superimposition of the light emitted by all the lenses. Preferably, the light exiting from an individual lens is essentially completely superimposed on the light coupling surface with the light exiting from all other lenses. The light intensity at the light coupling surface of the optics element per unit area is thus advantageously essentially constant or of the same magnitude. In other words, the differences in intensity of the light emitted by the lighting means are compensated or evened out by the superimposition of the light emitted by each lens.
Um eine besonders gleichmäßige Beleuchtung der Lichteinkoppelfläche des Optikelements zu ermöglichen, weist insbesondere jede Linse die gleichen Abmessungen und/oder optischen Eigenschaften auf.In order to enable a particularly uniform illumination of the light coupling surface of the optics element, each lens has the same dimensions and/or optical properties.
Vorzugsweise beträgt der Durchmesser jeder Linse 0,2 mm bis 5 mm, vorzugsweise 0,6 mm bis 3 mm, besonders bevorzugt 1 mm bis 2 mm. Durch die relativ zu der Lichtaustrittsfläche des Kollimators kleine Linsenfläche, kann die gesamte Lichtaustrittsfläche aus einer hohen Anzahl an Linsen gebildet sein. Dies führt vorteilhafterweise zu einer Überlagerung von einer hohen Anzahl an Lichtbündeln, was wiederum die gleichmäßige Beleuchtung der Lichteinkoppelfläche des Optikelements verbessert. Der Kollimator kann konisch geformt sein und einen Öffnungswinkel von beispielsweise 25° bis 30° aufweisen.Preferably the diameter of each lens is 0.2mm to 5mm, preferably 0.6mm to 3mm, most preferably 1mm to 2mm. Because the lens surface is small relative to the light exit surface of the collimator, the entire light exit surface can be formed from a large number of lenses. This advantageously leads to a superimposition of a large number of light bundles, which in turn improves the uniform illumination of the light coupling surface of the optical element. The collimator can be conically shaped and have an opening angle of, for example, 25° to 30°.
Insbesondere ist die Lichtaustrittsfläche des Kollimators kleiner als die Lichteinkoppelfläche des Optikelements. Durch einen, relativ zu dem Optikelement, kleinen Kollimator, kann die Gesamtgröße der Beleuchtungsvorrichtung verkleinert werden.In particular, the light exit surface of the collimator is smaller than the light coupling surface of the optical element. The overall size of the lighting device can be reduced by a collimator that is small relative to the optical element.
Um störendes Streulicht, welches seitlich an dem Optikelement vorbeistrahlen kann und somit den gleichmäßigen Leuchteindruck verschlechtert, zu vermeiden, kann die Lichtaustrittsfläche des Kollimators zu der Lichteinkoppelfläche des Optikelements derart beabstandet und angeordnet sein, dass das aus jeder Linse austretende Licht ausschließlich die Lichteinkoppelfläche des Optikelements vollständig bzw. exakt beleuchtet. Vorzugsweise werden die einzelnen Linsen von einem Fachmann derart berechnet, dass, in einem Abstand von den Linsen, welcher der Brennweite der Linsen entspricht, jede Linse eine gleich große Fläche, welche der Lichteinkoppelfläche des Optikelements entspricht, beleuchtet wird.In order to avoid disturbing scattered light, which can radiate past the side of the optics element and thus impairs the uniform lighting impression, the light exit surface of the collimator can be connected to the light coupling surface of the optics element in such a way be spaced and arranged so that the light emerging from each lens exclusively illuminates the light coupling surface of the optical element completely or exactly. The individual lenses are preferably calculated by a person skilled in the art in such a way that, at a distance from the lenses which corresponds to the focal length of the lenses, each lens is illuminated on an area of the same size, which corresponds to the light in-coupling area of the optical element.
Die Beleuchtungsvorrichtung kann ein erstes und ein zweites Lichtmodul aufweisen, wobei vorzugsweise das erste Lichtmodul eine erste Teilfläche der Lichteinkoppelfläche beleuchtet, und das zweite Lichtmodul eine zweite Teilfläche der Lichteinkoppelfläche beleuchtet, wobei beispielsweise die erste und die zweite Teilfläche jeweils eine Hälfte der Lichteinkoppelfläche bilden. Das erste und das zweite Lichtmodul können beispielsweise Leuchtmittel mit unterschiedlicher Farbe aufweisen, wodurch vorteilhafterweise über die Lichtauskoppelfläche des Optiksystems verschiedenfarbiges Licht abgestrahlt werden kann. Es kann auch das erste und das zweite Lichtmodul jeweils die gesamte Lichteinkoppelfläche des Optiksystems, vorzugsweise vollständig bzw. vollflächig, beleuchten. Die Beleuchtungsvorrichtung kann auch drei oder mehr Lichtmodule umfassen.The lighting device can have a first and a second light module, with the first light module preferably illuminating a first partial area of the light coupling surface, and the second light module illuminating a second partial surface of the light coupling surface, with the first and the second partial surface each forming one half of the light coupling surface, for example. The first and the second light module can, for example, have illuminants with different colors, as a result of which light of different colors can advantageously be emitted via the light coupling-out surface of the optical system. The first and the second light module can also each illuminate the entire light coupling surface of the optical system, preferably completely or over the entire surface. The lighting device can also include three or more light modules.
Um eine pro Flächeneinheit gleichmäßige bzw. homogene Lichtintensität an der Lichteinkoppelfläche des Optikelements zu erreichen, kann insbesondere die erste und die zweite Teilfläche von dem jeweiligen Lichtmodul überlappungsfrei beleuchtet werden.In order to achieve a light intensity that is uniform or homogeneous per unit area on the light in-coupling surface of the optical element, the first and the second partial surface can in particular be illuminated by the respective light module without overlapping.
Erfindungsgemäß ist ein Beleuchtungssystem vorgesehen, umfassend eine erfindungsgemäße Beleuchtungsvorrichtung und eine Beleuchtungseinheit, wobei die Beleuchtungseinheit dazu eingerichtet ist, Licht zu erzeugen und entlang einer Lichtabstrahlrichtung abzustrahlen, wobei die Lichtabstrahlrichtung auf die Brennebene der Linsen des Kollimators des Lichtmoduls gerichtet ist, wobei das Beleuchtungssystem eine Verstellvorrichtung umfasst, mit welcher das Optikelement der Beleuchtungsvorrichtung zwischen einer ersten und einer zweiten Position überführbar ist, wobei in der ersten Position das Optikelement derart angeordnet ist, dass das von dem zumindest einen Lichtmodul der Beleuchtungsvorrichtung abgestrahlte Licht auf die Lichteinkoppelfläche des Optikelements trifft, wobei in der zweiten Position das Optikelement derart angeordnet ist, dass kein von dem zumindest einen Lichtmodul der Beleuchtungsvorrichtung abgestrahltes Licht auf die Lichteinkoppelfläche des Optikelements trifft und das Optikelement außerhalb der Lichtabstrahlrichtung des von der Beleuchtungseinheit abstrahlbaren Lichts liegt.According to the invention, an illumination system is provided, comprising an illumination device according to the invention and an illumination unit, the illumination unit being set up to generate light and emit it along a light emission direction, with the light emission direction being aimed at the focal plane of the lenses of the collimator of the light module, the illumination system having an adjustment device comprises, with which the optical element of the lighting device can be transferred between a first and a second position, wherein in the first position the optical element is arranged in such a way that the light emitted by the at least one light module of the lighting device impinges on the light coupling surface of the optical element, wherein in the second position, the optical element is arranged in such a way that no light emitted by the at least one light module of the lighting device impinges on the light coupling surface of the optical element and that Optical element is outside the light emission direction of the light that can be emitted by the lighting unit.
Durch die Verstellbarkeit des Optiksystems, können, je nachdem in welcher Position sich das Optiksystem befindet, verschiedene Lichtverteilungen von dem Beleuchtungssystem erzeugt werden. Vorteilhafterweise muss nicht die gesamte Beleuchtungsvorrichtung oder die Beleuchtungseinheit des Beleuchtungssystems zwischen zwei Positionen verstellt werden, sondern lediglich das Optiksystem. Damit können kleinere, leistungsschwächere Verstellvorrichtungen, beispielsweise ein Linearantrieb oder ein Servomotor, verwendet werden. Ist das Beleuchtungssystem beispielsweise in einem Kraftfahrzeug eingebaut, ergibt sich der weitere Vorteil, dass weniger Bauraum für den Übergang zwischen der ersten und der zweiten Position zur Verfügung gestellt werden muss, da das zumindest eine Lichtmodul der Beleuchtungsvorrichtung und die Beleuchtungseinheit ortsfest verbaut werden können, da lediglich das Optiksystem verstellbar ist. Das Optiksystem kann beispielsweise an einer oder mehreren Führungsschienen verstellbar befestigt sein. Das Optikelement kann mit der Verstellvorrichtung auch um eine Schwenkachse verschwenkt werden, wobei sich das Optiksystem im verschwenkten Zustand außerhalb der Lichtausbreitungsrichtung des zumindest einen Lichtmoduls der Beleuchtungsvorrichtung und außerhalb der Lichtabstrahlrichtung der Beleuchtungseinheit befindet.Due to the adjustability of the optical system, different light distributions can be generated by the lighting system, depending on the position in which the optical system is located. Advantageously, the entire lighting device or the lighting unit of the lighting system does not have to be adjusted between two positions, but only the optical system. This means that smaller, less powerful adjustment devices, such as a linear drive or a servomotor, can be used. If the lighting system is installed in a motor vehicle, for example, there is the further advantage that less installation space has to be made available for the transition between the first and second position, since the at least one light module of the lighting device and the lighting unit can be installed in a stationary manner, since only the optical system is adjustable. The optics system can, for example, be adjustably fastened to one or more guide rails. The optical element can also be pivoted about a pivot axis with the adjustment device, the optical system being in the pivoted state outside the light propagation direction of the at least one light module of the lighting device and outside the light emission direction of the lighting unit.
Um ein besonders platzsparendes Beleuchtungssystem zu schaffen, können das Lichtmodul der Beleuchtungsvorrichtung und die Beleuchtungseinheit derart zueinander angeordnet sein, dass die Lichtausbreitungsrichtung des Kollimators des Lichtmoduls und die Lichtabstrahlrichtung der Beleuchtungseinheit einen spitzen Winkel zueinander aufweisen.In order to create a particularly space-saving lighting system, the light module of the lighting device and the lighting unit can be arranged relative to one another in such a way that the light propagation direction of the collimator of the light module and the light emission direction of the lighting unit have an acute angle to one another.
Bevorzugt weisen die Lichtausbreitungsrichtung des Kollimators des Lichtmoduls und die Lichtabstrahlrichtung der Beleuchtungseinheit einen Schnittpunkt auf, wobei der Schnittpunkt in der Brennebene der Linsen des Kollimators liegt. Mit anderen Worten sind das Lichtmodul der Beleuchtungsvorrichtung und die Beleuchtungseinheit derart zu einander positioniert, dass die Lichtausbreitungsrichtung und die Lichtabstrahlrichtung jeweils auf die Lichteinkoppelfläche des Optikelements gerichtet sind.The light propagation direction of the collimator of the light module and the light emission direction of the lighting unit preferably have an intersection point, with the intersection point lying in the focal plane of the lenses of the collimator. In other words, the light module of the lighting device and the lighting unit are positioned relative to one another in such a way that the light propagation direction and the light emission direction are each directed onto the light coupling surface of the optical element.
Wenn sich das Optikelement in der ersten Position befindet, kann sich das zumindest eine Lichtmodul der Beleuchtungsvorrichtung in einem aktiven Zustand befinden, in welchem Licht von dem zumindest einen Lichtmodul auf die Lichteinkoppelfläche abgestrahlt wird, wobei sich die Beleuchtungseinheit, während sich die Beleuchtungsvorrichtung in dem aktiven Zustand befindet, in einem inaktiven Zustand befindet, in welchem die Beleuchtungseinheit kein Licht abstrahlt.When the optical element is in the first position, the at least one light module of the lighting device can be in an active state, in which Light is emitted from the at least one light module onto the light coupling surface, with the lighting unit being in an inactive state while the lighting device is in the active state, in which the lighting unit does not emit any light.
Wenn sich das Optikelement in der zweiten Position befindet, kann sich die Beleuchtungseinheit in einem aktiven Zustand befinden, in welchem Licht von der Beleuchtungseinheit als Lichtbündel abgestrahlt wird, wobei sich das zumindest eine Lichtmodul der Beleuchtungsvorrichtung, während sich die Beleuchtungseinheit in dem aktiven Zustand befindet, in einem inaktiven Zustand befindet, in welchem das zumindest eine Lichtmodul kein Licht abstrahlt.When the optical element is in the second position, the lighting unit can be in an active state, in which light is emitted from the lighting unit as a light beam, with the at least one light module of the lighting device being in the active state while the lighting unit is in is in an inactive state in which the at least one light module does not emit any light.
Das Beleuchtungssystem kann insbesondere eine erste Lichtverteilung erzeugen, wenn sich das Optikelement in der ersten Position befindet und das zumindest eine Lichtmodul der Beleuchtungsvorrichtung in einem aktiven Zustand ist, und eine zweite Lichtverteilung erzeugen, wenn sich das Optikelement in der zweiten Position befindet und die Beleuchtungseinheit in einem aktiven Zustand ist, wobei vorzugsweise die erste und die zweite Lichtverteilung unterschiedlich sind. Damit ergibt sich der Vorteil, dass das Beleuchtungssystem mit der Verstellung des Optikelements zwischen verschiedenen Lichtverteilungen oder Beleuchtungsfunktionen wechseln kann, ohne dass ein Lichtmodul oder die Beleuchtungseinheit verstellt oder verschwenkt werden muss.In particular, the lighting system can generate a first light distribution when the optical element is in the first position and the at least one light module of the lighting device is in an active state, and generate a second light distribution when the optical element is in the second position and the lighting unit is in is an active state, preferably wherein the first and second light distributions are different. This results in the advantage that the lighting system can switch between different light distributions or lighting functions when the optical element is adjusted, without a light module or the lighting unit having to be adjusted or pivoted.
Bevorzugt umfasst die erste Lichtverteilung eine Lichtverteilung eines Tagfahrlichts oder eine Signallichtfunktion, und die zweite Lichtverteilung eine Abblendlichtverteilung oder Fernlichtverteilung. Vorteilhafterweise kann somit, wenn ein Tagfahrlicht oder eine Signallichtfunktion benötigt wird, das Lichtmodul der Beleuchtungsvorrichtung aktiv und das Optikelement in der ersten Position sein. Wird jedoch ein Abblendlicht oder ein Fernlicht benötigt, kann insbesondere das Lichtmodul der Beleuchtungsvorrichtung in einen inaktiven Zustand gebracht werden, wobei, insbesondere im Wesentlichen gleichzeitig, die Beleuchtungseinheit in einen aktiven Zustand gebracht wird und ferner das Optiksystem von der ersten in die zweite Position übergeführt wird. Damit kann der Übergang von verschiedenen Lichtfunktionen bzw. Lichtverteilungen einfach und rasch durchgeführt werden.The first light distribution preferably comprises a light distribution of a daytime running light or a signal light function, and the second light distribution comprises a low-beam light distribution or a high-beam light distribution. Advantageously, when a daytime running light or a signal light function is required, the light module of the lighting device can be active and the optical element can be in the first position. However, if low beam or high beam is required, the light module of the lighting device in particular can be brought into an inactive state, with the lighting unit being brought into an active state, in particular essentially at the same time, and the optical system being moved from the first to the second position . This means that the transition from different light functions or light distributions can be carried out quickly and easily.
Bevorzugt weisen die Beleuchtungsvorrichtung und/oder die Beleuchtungseinheit jeweils ein Leuchtmittel auf, welches dazu eingerichtet ist, weißes und/oder farbiges Licht zu erzeugen. Damit kann vorteilhafterweise die Beleuchtungsvorrichtung beispielsweise farbiges Licht für eine Signallichtfunktion und die Beleuchtungseinheit im Wesentlichen weißes Licht für ein Abblend- oder Fernlicht bereitstellen.The lighting device and/or the lighting unit preferably each have a lighting means which is set up to generate white and/or colored light. In this way, the lighting device can advantageously provide, for example, colored light for a signal light function and the lighting unit can provide essentially white light for a low beam or high beam.
An dieser Stelle sei erwähnt, dass ein Fachmann auf dem Gebiet der Kraftfahrzeugscheinwerfertechnik das nötige Fachwissen bzgl. der erforderlichen Steuerungselemente bzw. Steuerungsverfahren besitzt, weshalb auf Details zur mechanischen und elektrischen Steuerung der Beleuchtungsvorrichtung und des Beleuchtungssystems nicht näher eingegangen wird.At this point it should be mentioned that a person skilled in the field of motor vehicle headlight technology has the necessary expertise with regard to the required control elements or control methods, which is why details of the mechanical and electrical control of the lighting device and the lighting system are not discussed in detail.
Im Rahmen dieser Beschreibung sind die Begriffe "oben", "unten", "horizontal", "vertikal" als Angaben der Ausrichtung zu verstehen, wenn die Beleuchtungsvorrichtung bzw. das Beleuchtungssystem in normaler Benutzungsstellung angeordnet ist, nachdem sie bzw. es in einem im Kraftfahrzeugscheinwerfer eingebaut wurde.In the context of this description, the terms "top", "bottom", "horizontal", "vertical" are to be understood as indications of the orientation when the lighting device or the lighting system is arranged in the normal use position after it or it is in an im Motor vehicle headlight was installed.
Die Erfindung wird nachstehend anhand eines bevorzugten Ausführungsbeispiels, auf das sie jedoch nicht beschränkt sein soll, noch weiter erläutert. In den Zeichnungen zeigt:
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Fig. 1 eine perspektivische Ansicht einer erfindungsgemäßen Beleuchtungsvorrichtung mit zwei Lichtmodulen; -
Fig. 2 eine Draufsicht der Beleuchtungsvorrichtung gemäßFig. 1 ; -
Fig. 3 eine Rückansicht der Beleuchtungsvorrichtung gemäßFig. 1 ; -
Fig. 4 eine Draufsicht der Beleuchtungsvorrichtung mit einem Lichtmodul mit schematischem Lichtstrahlenverlauf; -
Fig. 4a eine Draufsicht der Beleuchtungsvorrichtung gemäßFig. 1 mit schematischem Lichtstrahlenverlauf; -
Fig. 5 eine seitliche Ansicht der Beleuchtungsvorrichtung mit schematischem Lichtstrahlenverlauf; -
Fig. 6 eine seitliche Ansicht des Beleuchtungssystems in einem ersten Betriebszustand; und -
Fig. 7 eine seitliche Ansicht des Beleuchtungssystems in einem zweiten Betriebszustand.
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1 a perspective view of a lighting device according to the invention with two light modules; -
2 a plan view of the lighting device according to FIG1 ; -
3 a rear view of the lighting device according to FIG1 ; -
4 a plan view of the lighting device with a light module with a schematic light beam path; -
Figure 4a a plan view of the lighting device according to FIG1 with schematic light beam path; -
figure 5 a side view of the lighting device with a schematic light beam path; -
6 a side view of the lighting system in a first operating state; and -
7 a side view of the lighting system in a second operating state.
Die Zeichnungen sind zur besseren Übersicht stark vereinfacht und zeigen nur die wesentlichen Komponenten der Erfindung.The drawings are greatly simplified for a better overview and only show the essential components of the invention.
Die
Die Lichtaustrittsfläche 3a des Kollimators 3 ist aus einer Vielzahl von Linsen 7 gebildet. Die Linsen 7 sind in einem gleichmäßigen Raster auf der gesamten Lichtaustrittsfläche 3 des Kollimators 3 angeordnet. Jede Linse 7 ist dazu eingerichtet, das Licht des Leuchtmittels 2a auf die Lichteinkoppelfläche 5a des Optikelements 5 divergent abzustrahlen, sodass jede der Vielzahl von Linsen 7 jeweils die Lichteinkoppelfläche 5a des Optikelements 5 beleuchtet. Alles Linsen 7 haben im Wesentlichen die gleiche Brennweite, wobei der Abstand zwischen dem Kollimator 3 und dem Optikelement 5 im Wesentlichen der Brennweite der Linsen 7 entspricht.The
Das Optikelement 5 ist in der gezeigten Ausführungsform plan bzw. eben und plattenförmig ausgestaltet, wobei das Optikelement 5 auch als gekrümmte Platte ausgebildet sein kann. Jede der Vielzahl von Linsen 7 beleuchtet die Lichteinkoppelfläche 5a des Optikelements 5 vollständig. Dadurch setzt sich die Beleuchtung der Lichteinkoppelfläche 5a aus einer Überlagerung des von allen Linsen 7 abgestrahlten Lichts zusammen. Jede Linse 7 hat die gleichen Abmessungen und/oder optischen Eigenschaften. Der Durchmesser jeder Linse 7 beträgt 0,2 mm bis 5 mm, vorzugsweise 0,6 mm bis 3 mm, besonders bevorzugt 1 mm bis 2 mm.In the embodiment shown, the
Wie in
In der Ausführungsform gemäß
In den
Die
Das Lichtmodul 2 der Beleuchtungsvorrichtung 1 und die Beleuchtungseinheit 9 sind derart zueinander angeordnet, dass die Lichtausbreitungsrichtung 4 des Kollimators 3 des Lichtmoduls 2 und die Lichtabstrahlrichtung 10 der Beleuchtungseinheit 9 einen spitzen Winkel zueinander aufweisen. Die Lichtausbreitungsrichtung 4 und die Lichtabstrahlrichtung 10 weisen einen Schnittpunkt auf, welcher in der Brennebene der Linsen 7 des Kollimators 3 liegt.The
Wenn sich das Optikelement 5 in der ersten Position befindet, ist das Lichtmodul 2 der Beleuchtungsvorrichtung 1 in einem aktiven Zustand befindet, in welchem Licht von dem Lichtmodul 2 auf die Lichteinkoppelfläche 5a abgestrahlt wird. Die Beleuchtungseinheit 9 ist zu diesem Zeitpunkt in einem inaktiven Zustand, in welchem die Beleuchtungseinheit 9 kein Licht abstrahlt.When the
Wenn sich das Optikelement 5 in der zweiten Position befindet (s.
Das Beleuchtungssystem 8 kann eine erste Lichtverteilung erzeugen, wenn sich das Optikelement 5 in der ersten Position befindet und das zumindest eine Lichtmodul 2 der Beleuchtungsvorrichtung 1 in einem aktiven Zustand ist. Ferner kann eine zweite Lichtverteilung erzeugt werden, wenn sich das Optikelement 5 in der zweiten Position befindet und die Beleuchtungseinheit 9 in einem aktiven Zustand ist.The
Die erste Lichtverteilung ist beispielsweise eine Lichtverteilung eines Tagfahrlichts oder eine Signallichtfunktion, und die zweite Lichtverteilung ist beispielsweise eine Abblendlichtverteilung oder Fernlichtverteilung. Demnach kann zwischen verschiedenen Lichtverteilungen umgeschaltet werden, je nachdem in welcher Position das Optikelement 5 ist.The first light distribution is, for example, a light distribution of a daytime running light or a signal light function, and the second light distribution is, for example, a low beam distribution or a high beam distribution. Accordingly, it is possible to switch between different light distributions, depending on the position in which the
Claims (15)
- Illumination device (1) for a motor vehicle headlamp, comprising:- at least one light module (2), the light module (2) comprising a luminous means (2a) and a collimator (3) assigned to the luminous means (2a), the luminous means (2a) generating light and coupling it into the collimator (3), the collimator (3) being set up so that the light generated by the luminous means (2a) emerges as a divergent light beam in a light propagation direction (4) via a light exit surface (3a) of the collimator (3),- an optical element (5), which is arranged downstream of the collimator (3) in the light propagation direction (4), having a light input surface (5a) and a light output surface (5b), the light which emerges from the collimator (3) being incident on the light input surface (5a) of the optical element (5), and is guided through the optical element (5) to the light output surface (5b) of the optical element (5), and emerges from the optical element (5) at the light output surface (5b), wherein the light input surface (5a) of the optical element (5) has a Fresnel optic, the Fresnel optics being set up to refract the light beams as they enter the optical element (5) in such a way that the light beams propagate parallel to one another within the optical element (5), the light output coupling surface (5b) of the optical element (5) having a multiplicity of optical elements (6), each optical element (6) being in each case designed and set up in such a way that the light emerges from each optical element (6) as a, preferably divergent, light bundlecharacterized in that
the light exit surface (3a) of the collimator (3) is formed by a plurality of lenses (7) which are preferably arranged in a uniform grid on the entire light exit surface (3a) of the collimator (3), each lens (7) being arranged to divergently radiate the light of the illuminant (2a) onto the light input surface (5a) of the optical element (5) such that each of the plurality of lenses (7) respectively illuminates the light input surface (5a) of the optical element (5), all of the lenses (7) having substantially the same focal length, wherein the collimator (3) and the optical element (5) are spaced apart from each other, the spacing corresponding substantially to the focal length of the lenses (7). - Illumination device (1) according to claim 1, wherein the optical element (5) is plate-shaped, wherein the plate-shaped optical element (5) is curved or planar.
- Illumination device (1) according to any one of the preceding claims, wherein each of the plurality of lenses (7) completely illuminates the light incoupling surface (5a) of the optical element (5), wherein the illumination of the light incoupling surface (5a) is composed of a superposition of the light emitted by all lenses (7).
- Illumination device (1) according to any one of the preceding claims, wherein each lens (7) has the same dimensions and/or optical properties.
- Illumination device (1) according to any one of the preceding claims, wherein the diameter of each lens (7) is 0.2 mm to 5 mm, preferably 0.6 mm to 3 mm, more preferably 1 mm to 2 mm.
- Illumination device (1) according to any one of the preceding claims, wherein the light emitting area (3a) of the collimator (3) is smaller than the light coupling area (5a) of the optical element (5).
- Illumination device (1) according to one of the preceding claims, wherein the light exit surface (3a) of the collimator (3) is spaced and arranged relative to the light incoupling surface (5a) of the optical element (5) in such a way that the light emerging from each lens (7) illuminates exclusively the light incoupling surface (5a) of the optical element (5) completely and exactly.
- Illumination device (1) according to any one of the preceding claims, comprising a first (2) and a second light module (2a), wherein the first light module (2) illuminates a first partial surface of the light incoupling surface (5a), and the second light module (2b) illuminating a second partial surface of the light incoupling surface (5a), wherein, for example, the first and second partial surfaces each form one half of the light incoupling surface (5a), wherein preferably the first and second partial surfaces are illuminated without overlapping.
- Illumination system (8) comprising an illumination device (1) according to any one of the preceding claims and an illumination unit (9), wherein the illumination unit (9) is arranged to generate and radiate light along a light radiation direction (10), wherein the light emission direction (10) is directed towards the focal plane of the lenses (7) of the collimator (3) of the light module (2), wherein the illumination system (8) comprises an adjustment device (11) with which the optical element (5) of the illumination device (1) is transferable between a first and a second position, wherein in the first position the optical element (5) is arranged in such a way that the light emitted by the at least one light module (2) of the illumination device (1) impinges on the light coupling surface (5a) of the optical element (5), wherein in the second position the optical element (5) is arranged in such a way that no light emitted by the at least one light module (2) of the illumination device (1) impinges on the light coupling surface (5a) of the optical element (5), that no light emitted by the at least one light module (2) of the illumination device (1) impinges on the light coupling surface (5a) of the optical element (5) and the optical element (5) lies outside the light emission direction (10) of the light that can be emitted by the illumination unit (9).
- Illumination system (8) according to claim 9, wherein the light module (2) of the illumination device (1) and the illumination unit (9) are arranged relative to one another in such a way that the light propagation direction (4) of the collimator (3) of the light module (2) and the light emission direction (10) of the illumination unit (9) have an acute angle relative to one another.
- Illumination system (8) according to claim 9 or 10, wherein the light propagation direction (4) of the collimator (3) of the light module (2) and the light emission direction (10) of the illumination unit (9) have a point of intersection, said point of intersection being located in the focal plane of the lenses (7) of the collimator (3).
- Illumination system (8) according to any one of claims 9 to 11, wherein, when the optical element (5) is in the first position, the at least one light module (2) of the illumination device (1) is in an active state, in which light is emitted from the at least one light module (2) onto the light coupling surface (5a), wherein the illumination unit (9), while the illumination device (1) is in the active state, is in an inactive state in which the illumination unit (9) does not emit light.
- Illumination system (8) according to any one of claims 9 to 12, wherein, when the optical element (5) is in the second position, the illumination unit (9) is in an active state in which light is emitted from the illumination unit (9) as a light beam, wherein, while the illumination unit (9) is in the active state, the at least one light module (2) of the illumination device (1) is in an inactive state in which the at least one light module (2) does not emit light.
- Illumination system (8) according to any one of claims 9 to 13, wherein the lighting system (8) generates a first light distribution when the optical element (5) is in the first position and the at least one light module (2) of the lighting device (1) is in an active state, and generates a second light distribution, when the optical element (5) is in the second position and the lighting unit (9) is in an active state, wherein preferably the first and the second light distribution are different, wherein preferably the first light distribution comprises a light distribution of a daytime running light or a signal light function, and the second light distribution comprises a low beam light distribution or high beam light distribution.
- Illumination system (8) according to any one of claims 9 to 14, wherein the illumination device (1) and/or the illumination unit (9) each comprises an illuminant which is adapted to generate white and/or colored light.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19195885.9A EP3789658A1 (en) | 2019-09-06 | 2019-09-06 | Lighting device for a motor vehicle headlight |
PCT/EP2020/072517 WO2021043544A1 (en) | 2019-09-06 | 2020-08-11 | Lighting device for a motor vehicle headlight |
Publications (2)
Publication Number | Publication Date |
---|---|
EP4025827A1 EP4025827A1 (en) | 2022-07-13 |
EP4025827B1 true EP4025827B1 (en) | 2023-07-19 |
Family
ID=67875327
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19195885.9A Withdrawn EP3789658A1 (en) | 2019-09-06 | 2019-09-06 | Lighting device for a motor vehicle headlight |
EP20753367.0A Active EP4025827B1 (en) | 2019-09-06 | 2020-08-11 | Lighting device for a motor vehicle headlight |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19195885.9A Withdrawn EP3789658A1 (en) | 2019-09-06 | 2019-09-06 | Lighting device for a motor vehicle headlight |
Country Status (6)
Country | Link |
---|---|
US (1) | US11796148B2 (en) |
EP (2) | EP3789658A1 (en) |
JP (1) | JP7241241B2 (en) |
KR (1) | KR20220037519A (en) |
CN (1) | CN114286914B (en) |
WO (1) | WO2021043544A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021113704A1 (en) * | 2021-05-27 | 2022-12-01 | HELLA GmbH & Co. KGaA | headlights for vehicles |
EP4202289B1 (en) * | 2021-12-23 | 2024-08-21 | ZKW Group GmbH | Lens system for a motor vehicle headamp |
EP4290128A1 (en) * | 2022-06-07 | 2023-12-13 | ZKW Group GmbH | Lighting device for a motor vehicle headlamp or a motor vehicle |
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CH296715A (en) * | 1950-01-02 | 1954-02-28 | Wagner Karoline | Headlights for vehicles, in particular for motor vehicles. |
DE1259747B (en) * | 1962-07-24 | 1968-01-25 | Elastic Stop Nut Corp | Arrangement for preventing phantom light in a signal light system for Automobileod. like |
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DE19822846C2 (en) * | 1998-05-22 | 2000-06-08 | Metz Werke Gmbh & Co Kg | Optical system with several optical elements for a lighting arrangement with variable light intensity distribution |
FR2782370B1 (en) * | 1998-08-14 | 2000-11-10 | Valeo Vision | HOMOGENEOUS ILLUMINATION LIGHT INCLUDING SMOOTH BEACHES |
JP3839235B2 (en) * | 2000-09-18 | 2006-11-01 | 株式会社小糸製作所 | Vehicle lighting |
JP2005228715A (en) * | 2004-02-16 | 2005-08-25 | Koito Mfg Co Ltd | Vehicular head-light |
DE102014112937B4 (en) * | 2014-09-09 | 2018-05-24 | HELLA GmbH & Co. KGaA | Lighting device for vehicles |
DE102015213827B4 (en) * | 2015-07-22 | 2021-03-18 | Automotive Lighting Reutlingen Gmbh | Lens attachment for a signal lamp of a motor vehicle lighting device |
CN106555959A (en) * | 2015-09-18 | 2017-04-05 | 堤维西交通工业股份有限公司 | Double lens distance lamp switching car light |
AT517885B1 (en) * | 2015-10-23 | 2018-08-15 | Zkw Group Gmbh | Microprojection light module for a motor vehicle headlight for generating aberration-free light distributions |
AT517887B1 (en) | 2015-10-23 | 2018-06-15 | Zkw Group Gmbh | Microprojection light module for vehicle headlights |
JP6655978B2 (en) * | 2015-12-18 | 2020-03-04 | 株式会社小糸製作所 | Vehicle lighting |
AT518552B1 (en) * | 2016-08-19 | 2017-11-15 | Zkw Group Gmbh | Lighting unit for a motor vehicle headlight for generating at least two light distributions |
CN207364926U (en) * | 2017-04-25 | 2018-05-15 | 广东烨嘉光电科技股份有限公司 | A kind of curved month type lens of car light system |
CN108036277B (en) * | 2017-12-25 | 2020-10-27 | 上海小糸车灯有限公司 | Car light and light path conduction device thereof |
CN108397746B (en) * | 2018-04-13 | 2024-06-14 | 华域视觉科技(上海)有限公司 | Far and near light system and car light based on light guide |
US10222019B1 (en) * | 2018-04-30 | 2019-03-05 | Tan De Tech Co., Ltd. | Light module of laser headlamp |
KR20200080838A (en) * | 2018-12-27 | 2020-07-07 | 에스엘 주식회사 | lamp for vehicle |
-
2019
- 2019-09-06 EP EP19195885.9A patent/EP3789658A1/en not_active Withdrawn
-
2020
- 2020-08-11 US US17/639,421 patent/US11796148B2/en active Active
- 2020-08-11 CN CN202080062086.4A patent/CN114286914B/en active Active
- 2020-08-11 KR KR1020227007358A patent/KR20220037519A/en not_active Application Discontinuation
- 2020-08-11 JP JP2022514829A patent/JP7241241B2/en active Active
- 2020-08-11 WO PCT/EP2020/072517 patent/WO2021043544A1/en unknown
- 2020-08-11 EP EP20753367.0A patent/EP4025827B1/en active Active
Also Published As
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JP2022547104A (en) | 2022-11-10 |
EP3789658A1 (en) | 2021-03-10 |
US20220299182A1 (en) | 2022-09-22 |
CN114286914B (en) | 2024-04-19 |
KR20220037519A (en) | 2022-03-24 |
CN114286914A (en) | 2022-04-05 |
WO2021043544A1 (en) | 2021-03-11 |
JP7241241B2 (en) | 2023-03-16 |
EP4025827A1 (en) | 2022-07-13 |
US11796148B2 (en) | 2023-10-24 |
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