EP2771613B1 - Lighting module for a motor vehicle - Google Patents

Lighting module for a motor vehicle Download PDF

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Publication number
EP2771613B1
EP2771613B1 EP13708335.8A EP13708335A EP2771613B1 EP 2771613 B1 EP2771613 B1 EP 2771613B1 EP 13708335 A EP13708335 A EP 13708335A EP 2771613 B1 EP2771613 B1 EP 2771613B1
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EP
European Patent Office
Prior art keywords
lens
lens portion
illumination
light
module according
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EP13708335.8A
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German (de)
French (fr)
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EP2771613A1 (en
Inventor
Dietmar KIESLINGER
Andreas Moser
Friedrich Bauer
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ZKW Group GmbH
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ZKW Group GmbH
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Publication of EP2771613A1 publication Critical patent/EP2771613A1/en
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Classifications

    • 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
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • 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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device
    • F21S41/148—Light emitting diodes [LED] the main emission direction of the LED being angled to the optical axis of the illuminating device the main emission direction of the LED being perpendicular to the optical axis
    • 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
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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
    • F21S41/265—Composite lenses; Lenses with a patch-like 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
    • 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
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/26—Elongated lenses
    • 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
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/17—Arrangement or contour of the emitted light for regions other than high beam or low beam
    • F21W2102/18—Arrangement or contour of the emitted light for regions other than high beam or low beam for overhead signs

Definitions

  • the invention relates to a lighting module for a motor vehicle with the features of the preamble of claim 1.
  • the invention further relates to a vehicle headlight with at least one such lighting module.
  • light from the at least one lighting unit is deflected in the forward direction of the lighting module by a lens arranged on the front of the lighting module and emitted onto the roadway, where it can form a defined light distribution pattern, such as a low beam distribution or a high beam distribution.
  • the light distribution is essentially influenced by the design of the lens used. It is known that imaging errors are unavoidable in spherical lenses. Accordingly, in order to be able to at least partially correct such lens errors, aspherical lenses are used. As a rule, a compromise must always be found as to which imaging errors are (more) corrected in favor of other imaging errors.
  • the problem can arise in particular with a lighting module described at the beginning that an undesired gap occurs due to the thickness (in the vertical direction) of the diaphragm in the high beam distribution. It is an object of the invention to provide a solution to this problem.
  • Headlights are usually designed for an image distance (distance of the image plane) of 25 meters, e.g. according to the ECE regulation.
  • Other regulations e.g. in the USA (SAE regulation), however, provide for a width of 10 meters, for which a headlight is to be designed.
  • SAE regulation e.g. in the USA
  • At least two lens areas differ with regard to the calculation rules on which they are based in at least one of the above-mentioned parameters, which are included in the respective calculation rule.
  • the division into lens areas takes place on the light entry surface of the lens.
  • the light entry surface is flat over all areas, while the light exit surface has a different curvature depending on the lens area, etc.
  • the individual lens areas of the lens differ from one another both on the light entry surface and on the light exit surface.
  • the transition between two adjacent areas on the light exit surface is continuous. This results in a flowing, soft transition, the is aesthetically pleasing, which can be particularly advantageous for the outside of the lens. In addition, such a surface is easy to manufacture.
  • transition between two adjacent areas on the light exit surface is discontinuous, for example in the form of a staircase. Such transitions are easier to calculate.
  • the range limits are clearly recognizable, but undesirable stray light may occur at the steps or the steps can be perceived as less visually appealing.
  • any combination is possible, such as continuous transition (continuous transitions) on one side, discontinuous transition or discontinuous transitions on the other side or even continuous transition between two areas on one side and discontinuous transition between two other areas on the same side, etc. .
  • the lens is divided into two, three or four lens areas.
  • the individual parameters that flow into a calculation rule can each be constant for a lens area. However, it can also be provided that one, several or all parameters of a calculation rule for a lens area vary as a function of the position of the lens area being considered.
  • an image generated by this lens area can be deliberately blurred or shifted, for example.
  • the lens area under consideration is computationally composed of a large number of smaller lens sub-areas, for example of several hundred such sub-areas, which when combined then form the lens area.
  • Such parameters that are variable over a lens area typically change continuously, for example linear, quadratic, sigmoid, etc.
  • a lens according to the invention can be optimally used if it is further provided that defined light emission areas of a lighting unit are only in a defined, assigned lens area or in two or more defined, assigned lens areas the lens emit light. In this way, the lighting unit and the lens or the areas assigned to one another can be optimally matched to one another.
  • each lighting unit emitting light only in at least one, two or more lens areas, preferably exactly one defined lens area of the lens.
  • the at least one lighting unit comprises at least one reflector and at least one light source assigned to the at least one reflector.
  • the (different) light emission region or regions are formed by the reflecting surface or surfaces of the reflector or reflectors and / or by two or more such lighting units.
  • Figure 1 shows a lighting module, specifically an LED bi-function projection module 1, which comprises a lighting device 2 and a lens 3.
  • the lighting device 2 consists of an upper reflector 20, to which a light source 22 in the form of one or more LEDs is assigned (reflector 20 and light source 22 form the upper lighting unit 2a), and a lower reflector 21 with a light source 23, also in the form of one or more LEDs (reflector 21 and light source 23 form a second, lower lighting unit).
  • the two light sources 22, 23 can preferably be controlled separately.
  • the light sources 22, 23 lie essentially in a focal point of the assigned reflector 20, 21.
  • the focal plane of the lens 3 runs approximately or exactly through the second focal points of the two reflectors 20, 21.
  • a (in this case rigid) horizontal diaphragm 24 is provided, the optically effective edge of which faces the lens 3 in order to produce a light-dark boundary.
  • a low beam distribution LVb as in FIG Figure 1a are generated, a part LVa of a high beam distribution is generated via the lower lighting unit 2b, the overall light distribution (entire high beam distribution) when the upper and lower lighting unit is activated is designated LV.
  • a lens 30 modified compared to lens 3 is used according to the invention.
  • the lens 30 has two lens areas 30a, 30b, the lower lens area 30b from the lower section of the lens 3 (that section which lies below the optical axis X of the module) Figure 1 corresponds to.
  • the upper lens region 30a is tilted in relation to the “original” lens contour of the lens 3 in the direction of the lighting units 2.
  • the light entry surface 30a ' which is also tilted towards the optical axis X, is "parallelized" to the flat light entry surface of the lens area 30b, that is, the light entry surface represents a continuous plane which is preferably normal to the axis X.
  • the upper lens half looks as if its axis had been shifted downwards in parallel and its center thickness had been slightly increased.
  • the lens areas therefore only differ in terms of the light exit surface, the two lens areas 30a, 30b merging into one another discontinuously at the light exit surface, for example as shown.
  • An unsteady transition offers the best use of space, but it is more difficult to create.
  • a "rounded", steady transition on the other hand, is easier to manufacture, but can, under certain circumstances, lead to scattered light.
  • the lens 30 corresponds to an asphere like the lens 3 from Figure 1 , these form a light distribution LVb 'as in Figure 2a shown which in the shape and position of the light distribution LVb Figure 1a corresponds to.
  • the lens area 30a is optimized in such a way that the light beams are refracted more downwardly the further up a light beam passes through the lens area 30a.
  • the light distribution LVa 'generated over the upper lens region 30a is shifted downwards, as a result of which the gap S is opened out Figure 1a concludes like this in Figure 2a is shown, so that a closed (long-range) light distribution LV 'results.
  • the lower lighting unit 2b only uses a certain area of the lens 30 to generate the high beam distribution, preferably only the upper area 30a.
  • Light from the upper lighting unit 2a can in principle pass through the entire lens 30, but the low beam preferably passes through other areas of the lens (namely through the lower sub-area 30b) than the high beam.
  • the two lens areas 30a, 30b are thus preferably each illuminated by their own lighting unit 2a, 2b assigned to the respective lens area 30a, 30b, with each lighting unit 2a, 2b preferably emitting light only into the lens area 30a, 30b assigned to it.
  • the lens 30 off Figure 2 thus has two different lens regions 30a, 30b which have different imaging properties and are based, for example, on different calculation rules, that is to say, for example, were determined by means of different calculation rules.
  • the two calculation rules differ in the parameter that the "optical axis" of the area 30a has been tilted with respect to the module axis X (see FIG Figure 2b , Tilting by angle a), while the optical axis of the lower region 30b continues to run parallel to the X axis.
  • the resulting lens 30 accordingly no longer has a clear optical axis.
  • the optical axis of the area 30a in the example shown is tilted by approx. 1.3 ° relative to the module axis X, as shown in FIG Figure 2b is sketched.
  • Figure 2b illustrates the process of how the upper region 30a of the lens 30 is calculated / generated. This is based on a lens 3 Figure 1 (left lens in Figure 2b ) and tilts it by the angle a. This results in the in Figure 2b right, tilted lens, the area above the X axis of which forms the contour of the light exit surface of the lens 30.
  • the light entry surface of the upper area is tilted against the axis X at an angle not equal to 90 °.
  • This light entry surface is "straightened" (mathematically or during production) so that a continuously flat light entry surface results in the resulting lens 30, as already described above.
  • this is equivalent to shifting the lens axis parallel downwards and slightly increasing the center thickness.
  • the invention makes it possible to implement a lighting module or a vehicle headlight with at least one such module with which legal regulations such as ECE, SAE, CCC, etc. can be met.

Description

Die Erfindung betrifft ein Beleuchtungsmodul für ein Kraftfahrzeug mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to a lighting module for a motor vehicle with the features of the preamble of claim 1.

Weiters betrifft die Erfindung einen Fahrzeugscheinwerfer mit zumindest einem solchen Beleuchtungsmodul.The invention further relates to a vehicle headlight with at least one such lighting module.

Mit einem solchen Beleuchtungsmodul wird Licht aus der zumindest einen Beleuchtungseinheit durch eine an der Vorderseite des Beleuchtungsmoduls angeordnete Linse in der Vorwärtsrichtung des Beleuchtungsmoduls abgelenkt und auf die Fahrbahn abgestrahlt, wo es ein definiertes Lichtverteilungsmuster, etwa eine Abblendlichtverteilung oder eine Fernlichtverteilung bilden kann.With such a lighting module, light from the at least one lighting unit is deflected in the forward direction of the lighting module by a lens arranged on the front of the lighting module and emitted onto the roadway, where it can form a defined light distribution pattern, such as a low beam distribution or a high beam distribution.

Die Lichtverteilung wird bei solchen Projektionssystemen wesentlich von der Ausgestaltung der verwendeten Linse beeinflusst. Bekanntermaßen sind bei sphärischen Linsen Abbildungsfehler unvermeidlich. Entsprechend werden, um solche Linsenfehler zumindest teilweise korrigieren zu können, asphärische Linsen verwendet. In der Regel muss dabei immer ein Kompromiss gefunden werden, welche Abbildungsfehler zu Gunsten anderer Abbildungsfehler (stärker) korrigiert werden.In such projection systems, the light distribution is essentially influenced by the design of the lens used. It is known that imaging errors are unavoidable in spherical lenses. Accordingly, in order to be able to at least partially correct such lens errors, aspherical lenses are used. As a rule, a compromise must always be found as to which imaging errors are (more) corrected in favor of other imaging errors.

Unter gewissen Voraussetzungen kann bei einem eingangs beschriebenen Beleuchtungsmodul insbesondere das Problem auftreten, dass aufgrund der Dicke (in vertikaler Richtung) der Blende in der Fernlichtverteilung ein unerwünschter Spalt auftritt.Es ist eine Aufgabe der Erfindung, eine Lösung für dieses Problem anzugeben.Under certain conditions, the problem can arise in particular with a lighting module described at the beginning that an undesired gap occurs due to the thickness (in the vertical direction) of the diaphragm in the high beam distribution. It is an object of the invention to provide a solution to this problem.

Diese Aufgabe wird mit einem eingangs erwähnten Beleuchtungsmodul mit den Merkmalen des Kennzeichens des Anspruchs 1 gelöst.This object is achieved with a lighting module mentioned at the beginning with the features of the characterizing part of claim 1.

Ein eingangs genanntes Beleuchtungsmodul, bei dem allerdings das Problem eines Spaltes nicht auftritt, ist aus der US 2007/086202 A1 bekannt.A lighting module mentioned at the beginning, in which, however, the problem of a gap does not arise, is from the US 2007/086202 A1 known.

Bei einer konkreten Ausführungsform der Erfindung ist vorgesehen, dass zur Berechnung der Linsenbereiche, etwas unter Verwendung von Berechnungsregeln, zumindest einer der folgenden Parameter verwendet wird:

  • *) Abbildungsmaßstab (Vergrößerung) des Linsenbereiches;
  • *) Position bzw. Abstand der Objektebene in Bezug auf den Linsenbereich;
  • *) Position bzw. Abstand der objektseitigen Brennebene in Bezug auf den Linsenbereich;
  • *) Position bzw. Abstand der Bildebene in Bezug auf den Linsenbereich;
  • *) Schnittweite des Linsenbereiches;
  • *) Ausrichtung der optischen Achse des Linsenbereiches;
  • *) Auswahl des zu korrigierenden Abbildungsfehlers.
In a specific embodiment of the invention, it is provided that at least one of the following parameters is used to calculate the lens areas, somewhat using calculation rules:
  • *) Image scale (enlargement) of the lens area;
  • *) Position or distance of the object plane in relation to the lens area;
  • *) Position or distance of the object-side focal plane in relation to the lens area;
  • *) Position or distance of the image plane in relation to the lens area;
  • *) Back focus of the lens area;
  • *) Alignment of the optical axis of the lens area;
  • *) Selection of the aberration to be corrected.

Scheinwerfer werden üblicherweise, z.B. nach der ECE-Regelung für eine Bildentfernung (Abstand der Bildebene) von 25 Metern entworfen. Andere Regelungen, z.B. in den USA (SAE-Regelung) sehen hingegen z.B. eine Weite von 10 Metern vor, für welche ein Scheinwerfer zu entwerfen ist. Durch das Vorsehen von zwei Linsenbereichen, die für unterschiedliche Positionen der Bildebene entworfen sind, kann es z.B. möglich werden, einen Scheinwerfer bzw. ein Lichtmodul zu entwerfen, welches beiden Regelungen genügt.Headlights are usually designed for an image distance (distance of the image plane) of 25 meters, e.g. according to the ECE regulation. Other regulations, e.g. in the USA (SAE regulation), however, provide for a width of 10 meters, for which a headlight is to be designed. By providing two lens areas, which are designed for different positions of the image plane, it can be possible, for example, to design a headlight or a light module that satisfies both regulations.

Insbesondere ist dabei vorgesehen, dass sich zumindest zwei Linsenbereiche hinsichtlich der ihnen zu Grunde liegenden Berechnungsregeln in zumindest einem der oben angeführten Parameter, welcher in die jeweilige Berechnungsregel einfließt, unterscheiden.In particular, it is provided that at least two lens areas differ with regard to the calculation rules on which they are based in at least one of the above-mentioned parameters, which are included in the respective calculation rule.

Die Einteilung in Linsenbereiche erfolgt dabei auf der Lichteintrittsfläche der Linse. Die Lichteintrittsfläche ist über alle Bereiche eben ausgebildet, während die Lichtaustrittsfläche je nach Linsenbereich eine unterschiedliche Krümmung aufweist etc.The division into lens areas takes place on the light entry surface of the lens. The light entry surface is flat over all areas, while the light exit surface has a different curvature depending on the lens area, etc.

Es kann natürlich auch vorgesehen sein, dass sich die einzelnen Linsenbereiche der Linse sowohl auf der Lichteintrittsfläche als auch der Lichtaustrittsfläche voneinander unterscheiden.It can of course also be provided that the individual lens areas of the lens differ from one another both on the light entry surface and on the light exit surface.

Es kann von Vorteil sein, wenn der Übergang zwischen zwei benachbarten Bereichen an der Lichtaustrittsfläche stetig erfolgt. Dadurch ergibt sich ein fließender, weicher Übergang, der ästhetisch ansprechend ist, was insbesondere für die Linsenaußenseite von Vorteil sein kann. Außerdem ist eine solche Oberfläche einfach zu fertigen.It can be advantageous if the transition between two adjacent areas on the light exit surface is continuous. This results in a flowing, soft transition, the is aesthetically pleasing, which can be particularly advantageous for the outside of the lens. In addition, such a surface is easy to manufacture.

Es kann auch vorgesehen sein, dass der Übergang zwischen zwei benachbarten Bereichen an der Lichtaustrittsfläche unstetig, beispielsweise treppenförmig erfolgt. Solche Übergänge sind einfacher zu berechnen.It can also be provided that the transition between two adjacent areas on the light exit surface is discontinuous, for example in the form of a staircase. Such transitions are easier to calculate.

Die Bereichsgrenzen sind in einem solchen Fall offensichtlich erkennbar, u.U. kann an den Stufen aber unerwünschtes Streulicht auftreten bzw. die Stufen können als optisch weniger ansprechend empfunden werden.In such a case, the range limits are clearly recognizable, but undesirable stray light may occur at the steps or the steps can be perceived as less visually appealing.

Natürlich sind beliebige Kombinationen, wie z.B. stetiger Übergang (stetige Übergänge) an einer Seite, unstetiger Übergang bzw. unstetige Übergänge an der anderen Seite oder auch stetiger Übergang zwischen zwei Bereichen an einer Seite und unstetiger Übergang zwischen zwei weiteren Bereichen auf derselben Seite etc. möglich.Of course, any combination is possible, such as continuous transition (continuous transitions) on one side, discontinuous transition or discontinuous transitions on the other side or even continuous transition between two areas on one side and discontinuous transition between two other areas on the same side, etc. .

Typischerweise ist vorgesehen, dass die Linse in zwei, drei oder vier Linsenbereiche unterteilt ist.It is typically provided that the lens is divided into two, three or four lens areas.

Die einzelnen Parameter, die in eine Berechnungsregel einfließen, können für einen Linsenbereich jeweils konstant sein. Es kann aber auch vorgesehen sein, dass einer, mehrere oder alle Parameter einer Berechnungsregel für einen Linsenbereich in Abhängigkeit von der betrachteten Position des Linsenbereiches variieren.The individual parameters that flow into a calculation rule can each be constant for a lens area. However, it can also be provided that one, several or all parameters of a calculation rule for a lens area vary as a function of the position of the lens area being considered.

In einem solchen Fall kann eine Abbildung, die von diesem Linsenbereich erzeugt wird, z.B. bewusst verwischt oder verschoben werden. Bei einer solchen Variante setzt sich der betrachtete Linsenbereich rechnerisch aus einer Vielzahl kleinerer Linsenunterbereiche zusammen, beispielsweise aus mehreren hundert solcher Unterbereiche, die zusammengesetzt dann den Linsenbereich bilden. Typischweise ändern sich solche über einen Linsenbereich variablen Parameter kontinuierlich, beispielsweise linear, quadratisch, sigmoid etc.In such a case, an image generated by this lens area can be deliberately blurred or shifted, for example. In such a variant, the lens area under consideration is computationally composed of a large number of smaller lens sub-areas, for example of several hundred such sub-areas, which when combined then form the lens area. Such parameters that are variable over a lens area typically change continuously, for example linear, quadratic, sigmoid, etc.

Optimal kann eine erfindungsgemäße Linse ausgenützt werden, wenn weiters vorgesehen ist, dass definierte Lichtemissionsbereiche einer Beleuchtungseinheit lediglich in einen definierten, zugeordneten Linsenbereich oder in zwei oder mehrere definierte, zugeordnete Linsenbereiche der Linse Licht abstrahlen. Auf diese Weise können die Beleuchtungseinheit und die Linse bzw. die einander zugeordneten Bereiche optimal aufeinander abgestimmt werden.A lens according to the invention can be optimally used if it is further provided that defined light emission areas of a lighting unit are only in a defined, assigned lens area or in two or more defined, assigned lens areas the lens emit light. In this way, the lighting unit and the lens or the areas assigned to one another can be optimally matched to one another.

Es kann auch vorgesehen sein, dass zwei oder mehreren Beleuchtungseinheiten vorgesehen sind, wobei jede Beleuchtungseinheit Licht lediglich in zumindest einen, zwei oder mehrere Linsenbereiche, vorzugsweise genau einen definierten Linsenbereich der Linse emittiert.It can also be provided that two or more lighting units are provided, each lighting unit emitting light only in at least one, two or more lens areas, preferably exactly one defined lens area of the lens.

In jedem Fall ist es günstig, wenn die Lichtemissionsbereiche einer Beleuchtungseinheit und/oder die verschiedenen Beleuchtungseinheiten getrennt voneinander angesteuert werden können.In any case, it is favorable if the light emission areas of a lighting unit and / or the various lighting units can be controlled separately from one another.

Die zumindest eine Beleuchtungseinheit umfasst zumindest einen Reflektor und zumindest eine dem zumindest einen Reflektor zugeordnete Lichtquelle.The at least one lighting unit comprises at least one reflector and at least one light source assigned to the at least one reflector.

Der bzw. die (unterschiedlichen) Lichtemissionsbereiche werden von der oder den reflektierenden Oberflächen des oder der Reflektoren gebildet, und/oder von zwei oder mehreren solchen Beleuchtungseinheiten.The (different) light emission region or regions are formed by the reflecting surface or surfaces of the reflector or reflectors and / or by two or more such lighting units.

Im Folgenden ist die Erfindung an Hand von Beispielen wie in der Zeichnung dargestellt näher erläutert. In dieser zeigt

  • Fig. 1 eine Beleuchtungsvorrichtung in einem Vertikalschnitt nach dem Stand der Technik,
  • Fig. 1a mit einer Beleuchtungsvorrichtung nach Figur 1 erzeugte Lichtverteilungen,
  • Fig. 2 eine erfindungsgemäße Beleuchtungsvorrichtung in einem Vertikalschnitt mit modifizierter Linse,
  • Fig. 2a mit einer Beleuchtungsvorrichtung nach Figur 1 erzeugte Lichtverteilungen, und
  • Fig. 2b die Linse aus Figur 2 in einer vergrößerten Darstellung im Vergleich zu einer herkömmlichen Linse.
The invention is explained in more detail below using examples as shown in the drawing. In this shows
  • Fig. 1 a lighting device in a vertical section according to the prior art,
  • Fig. 1a with a lighting device according to Figure 1 generated light distributions,
  • Fig. 2 a lighting device according to the invention in a vertical section with a modified lens,
  • Fig. 2a with a lighting device according to Figure 1 generated light distributions, and
  • Figure 2b the lens off Figure 2 in an enlarged view compared to a conventional lens.

Figur 1 zeigt ein Beleuchtungsmodul, konkret ein LED-Bi-Funktions-Projektionsmodul 1, welches eine Beleuchtungsvorrichtung 2 und eine Linse 3 umfasst. Die Beleuchtungsvorrichtung 2 besteht aus einem oberen Reflektor 20, dem eine Lichtquelle 22 in Form von einer oder mehreren LEDs zugeordnet ist (Reflektor 20 und Lichtquelle 22 bilden die obere Beleuchtungseinheit 2a), sowie aus einem unteren Reflektor 21 mit einer Lichtquelle 23, ebenfalls in Form von einer oder mehreren LEDs (Reflektor 21 und Lichtquelle 23 bilden eine zweite, untere Beleuchtungseinheit). Die beiden Lichtquellen 22, 23 sind vorzugsweise getrennt ansteuerbar. Figure 1 shows a lighting module, specifically an LED bi-function projection module 1, which comprises a lighting device 2 and a lens 3. The lighting device 2 consists of an upper reflector 20, to which a light source 22 in the form of one or more LEDs is assigned (reflector 20 and light source 22 form the upper lighting unit 2a), and a lower reflector 21 with a light source 23, also in the form of one or more LEDs (reflector 21 and light source 23 form a second, lower lighting unit). The two light sources 22, 23 can preferably be controlled separately.

Die Lichtquellen 22, 23 liegen dabei im Wesentlichen in einem Brennpunkt des zugeordneten Reflektors 20, 21. Die Brennebene der Linse 3 verläuft in etwa bzw. exakt durch die zweiten Brennpunkte der beiden Reflektoren 20, 21.The light sources 22, 23 lie essentially in a focal point of the assigned reflector 20, 21. The focal plane of the lens 3 runs approximately or exactly through the second focal points of the two reflectors 20, 21.

Weiters ist eine (in diesem Fall starre) waagrechte Blende 24 vorgesehen, deren optisch wirksame Kante zur Erzeugung einer Hell-Dunkel-Grenze der Linse 3 zugewandt ist. Mit der oberen Beleuchtungseinheit 2a (Reflektor 20, Lichtquelle 22) kann somit eine Abblendlichtverteilung LVb wie in Figur 1a dargestellt erzeugt werden, über die untere Beleuchtungseinheit 2b wird ein Teil LVa einer Fernlichtverteilung erzeugt, die Gesamtlichtverteilung (gesamte Fernlichtverteilung) bei aktivierter oberer und unterer Beleuchtungseinheit ist mit LV bezeichnet.Furthermore, a (in this case rigid) horizontal diaphragm 24 is provided, the optically effective edge of which faces the lens 3 in order to produce a light-dark boundary. With the upper lighting unit 2a (reflector 20, light source 22), a low beam distribution LVb as in FIG Figure 1a are generated, a part LVa of a high beam distribution is generated via the lower lighting unit 2b, the overall light distribution (entire high beam distribution) when the upper and lower lighting unit is activated is designated LV.

Aufgrund der Dicke (in vertikaler Richtung) der Blende 24 ergibt sich allerdings in der Lichtverteilung LV ein unerwünschter Spalt S, wie dies in Figur 1a schematisch dargestellt ist.Due to the thickness (in the vertical direction) of the diaphragm 24, however, there is an undesired gap S in the light distribution LV, as shown in FIG Figure 1a is shown schematically.

Um dieses Problem zu beseitigen, wird erfindungsgemäß eine gegenüber der Linse 3 modifizierte Linse 30 verwendet. Die Linse 30 weist zwei Linsenbereiche 30a, 30b auf, wobei der untere Linsenbereich 30b dem unteren Abschnitt der Linse 3 (jener Abschnitt, der unterhalb der optischen Achse X des Moduls liegt) aus Figur 1 entspricht. Der obere Linsenbereich 30a ist gegenüber der "ursprünglichen" Linsenkontur der Linse 3 in Richtung der Beleuchtungseinheiten 2 verkippt. An der Lichteintrittsseite der Linse 30 wird dabei die ebenfalls gegen die optische Achse X verkippte Lichteintrittsfläche 30a' zu der ebenen Lichteintrittsfläche des Linsenbereichs 30b "parallelisiert", d.h., dass die Lichteintrittsfläche eine durchgehende Ebene darstellt, welche vorzugsweise normal auf die Achse X steht.In order to eliminate this problem, a lens 30 modified compared to lens 3 is used according to the invention. The lens 30 has two lens areas 30a, 30b, the lower lens area 30b from the lower section of the lens 3 (that section which lies below the optical axis X of the module) Figure 1 corresponds to. The upper lens region 30a is tilted in relation to the “original” lens contour of the lens 3 in the direction of the lighting units 2. On the light entry side of the lens 30, the light entry surface 30a ', which is also tilted towards the optical axis X, is "parallelized" to the flat light entry surface of the lens area 30b, that is, the light entry surface represents a continuous plane which is preferably normal to the axis X.

Die obere Linsenhälfte sieht somit rein formal so aus, als ob ihre Achse parallel nach unten verschoben wäre und deren Mittendicke geringfügig erhöht worden wäre.In purely formal terms, the upper lens half looks as if its axis had been shifted downwards in parallel and its center thickness had been slightly increased.

Die Linsenbereiche unterscheiden sich also in nur an der Lichtaustrittsfläche, wobei die beiden Linsenbereiche 30a, 30b an der Lichtaustrittsfläche beispielsweise wie gezeigt unstetig ineinander übergehen. Ein unstetiger Übergang bietet die beste Flächennutzung, ist allerdings schwieriger herzustellen. Ein "verrundeter", stetiger Übergang hingegen ist besser Herstellbar, kann aber u.U. zu Streulicht führen.The lens areas therefore only differ in terms of the light exit surface, the two lens areas 30a, 30b merging into one another discontinuously at the light exit surface, for example as shown. An unsteady transition offers the best use of space, but it is more difficult to create. A "rounded", steady transition, on the other hand, is easier to manufacture, but can, under certain circumstances, lead to scattered light.

Im unteren Bereich 30b entspricht die Linse 30 einer Asphäre wie die Linse 3 aus Figur 1, diese bilden eine Lichtverteilung LVb' wie in Figur 2a gezeigt, welcher in Form und Lage der Lichtverteilung LVb aus Figur 1a entspricht.In the lower region 30b, the lens 30 corresponds to an asphere like the lens 3 from Figure 1 , these form a light distribution LVb 'as in Figure 2a shown which in the shape and position of the light distribution LVb Figure 1a corresponds to.

Der Linsenbereich 30a ist dahingehend optimiert, dass die Lichtstrahlen umso stärker nach unten gebrochen werden, je weiter oben ein Lichtstrahl durch den Linsenbereich 30a durchtritt. Dadurch wird die über den oberen Linsenbereich 30a erzeugte Lichtverteilung LVa' nach unten verschoben, wodurch sich der Spalt S aus Figur 1a schließt, wie dies in Figur 2a dargestellt ist, sodass sich eine geschlossene (Fern-)Lichtverteilung LV' ergibt.The lens area 30a is optimized in such a way that the light beams are refracted more downwardly the further up a light beam passes through the lens area 30a. As a result, the light distribution LVa 'generated over the upper lens region 30a is shifted downwards, as a result of which the gap S is opened out Figure 1a concludes like this in Figure 2a is shown, so that a closed (long-range) light distribution LV 'results.

Bei der Auslegung der Beleuchtungseinheiten 2a, 2b und hier insbesondere der Reflektoren 20, 21 ist vorzugsweise darauf zu achten, dass die untere Beleuchtungseinheit 2b zur Erzeugung der Fernlichtverteilung nur einen bestimmten Bereich der Linse 30 nützt, vorzugsweise nur den oberen Bereich 30a.When designing the lighting units 2a, 2b, and here in particular the reflectors 20, 21, it is preferable to ensure that the lower lighting unit 2b only uses a certain area of the lens 30 to generate the high beam distribution, preferably only the upper area 30a.

Licht aus der oberen Beleuchtungseinheit 2a kann im Prinzip durch die gesamte Linse 30 durchtreten, vorzugsweise tritt das Abblendlicht aber durch andere Bereiche der Linse (nämlich durch den unteren Teilbereich 30b) als das Fernlicht.Light from the upper lighting unit 2a can in principle pass through the entire lens 30, but the low beam preferably passes through other areas of the lens (namely through the lower sub-area 30b) than the high beam.

Die beiden Linsenbereiche 30a, 30b werden somit vorzugsweise jeweils von einer eigenen, dem jeweiligen Linsenbereich 30a, 30b zugeordneten Beleuchtungseinheit 2a, 2b beleuchtet, wobei vorzugsweise jede Beleuchtungseinheit 2a, 2b Licht jeweils genau nur in den ihr zugeordneten Linsenbereich 30a, 30b abstrahlt.The two lens areas 30a, 30b are thus preferably each illuminated by their own lighting unit 2a, 2b assigned to the respective lens area 30a, 30b, with each lighting unit 2a, 2b preferably emitting light only into the lens area 30a, 30b assigned to it.

Die Linse 30 aus Figur 2 weist somit zwei unterschiedliche Linsenbereiche 30a, 30b auf, welche unterschiedlich abbildende Eigenschaften aufweisen und beispielsweise auf unterschiedlichen Berechnungsregeln basieren, also beispielsweise mittels unterschiedlicher Berechnungsregeln ermittelt wurden. Dabei unterscheiden sich die beiden Berechnungsregeln in dem Parameter, dass die "optische Achse" des Bereiches 30a gegenüber der Modul-Achse X verkippt wurde (siehe Figur 2b, Verkippung um Winkel a), während die optische Achse des unteren Bereiches 30b nach wie vor parallel zu der Achse X verläuft. Die resultierende Linse 30 weist dementsprechend keine eindeutige optische Achse mehr auf.The lens 30 off Figure 2 thus has two different lens regions 30a, 30b which have different imaging properties and are based, for example, on different calculation rules, that is to say, for example, were determined by means of different calculation rules. The two calculation rules differ in the parameter that the "optical axis" of the area 30a has been tilted with respect to the module axis X (see FIG Figure 2b , Tilting by angle a), while the optical axis of the lower region 30b continues to run parallel to the X axis. The resulting lens 30 accordingly no longer has a clear optical axis.

Beispielsweise ist dabei die optische Achse des Bereiches 30a bei dem gezeigten Beispiel um ca. 1,3° gegen die Modulachse X verkippt, wie dies in Figur 2b skizziert ist. Figur 2b veranschaulicht dabei den Vorgang, wie der obere Bereich 30a der Linse 30 berechnet/erzeugt wird. Dabei geht man von einer Linse 3 aus Figur 1 (linke Linse in Figur 2b) aus und kippt diese um den Winkel a. Somit ergibt sich die in Figur 2b rechte, verkippte Linse, deren oberhalb der Achse X liegender Bereich die Kontur der Lichtaustrittsfläche der Linse 30 bildet. Die Lichteintrittsfläche des oberen Bereiches ist gegen die Achse X gekippt unter einem Winkel ungleich 90°. Diese Lichteintrittsfläche wird "begradigt" (rechnerisch oder in der Fertigung), sodass sich bei der resultierenden Linse 30 wie oben schon beschrieben eine durchgehend ebene Lichteintrittsfläche ergibt.For example, the optical axis of the area 30a in the example shown is tilted by approx. 1.3 ° relative to the module axis X, as shown in FIG Figure 2b is sketched. Figure 2b illustrates the process of how the upper region 30a of the lens 30 is calculated / generated. This is based on a lens 3 Figure 1 (left lens in Figure 2b ) and tilts it by the angle a. This results in the in Figure 2b right, tilted lens, the area above the X axis of which forms the contour of the light exit surface of the lens 30. The light entry surface of the upper area is tilted against the axis X at an angle not equal to 90 °. This light entry surface is "straightened" (mathematically or during production) so that a continuously flat light entry surface results in the resulting lens 30, as already described above.

Wie weiter oben schon erwähnt, ist dies äquivalent zu einem Verschieben der Linsenachse parallel nach unten und geringfügiger Erhöhung der Mittendicke.As already mentioned above, this is equivalent to shifting the lens axis parallel downwards and slightly increasing the center thickness.

Die Erfindung erlaubt es, ein Beleuchtungsmodul bzw. einen Fahrzeugscheinwerfer mit zumindest einem solchen Modul zu realisieren, mit welchem sich gesetzliche Regelungen, wie ECE, SAE, CCC, usw. erfüllen lassen.The invention makes it possible to implement a lighting module or a vehicle headlight with at least one such module with which legal regulations such as ECE, SAE, CCC, etc. can be met.

Claims (10)

  1. Illumination module (1) for a motor vehicle, in particular projection module for a motor vehicle, comprising two illumination units (2a, 2b), an upper illumination unit (2a) and a lower illumination unit (2b), and a lens (30), preferably a projection lens, wherein the light radiated by the at least one illumination unit (2a, 2b) onto the lens (30) is projected by the lens (30) - in a mounted state of the illumination module - to a region located in front of the motor vehicle,
    wherein each illumination unit (2a, 2b) comprises a reflector (20, 21) and a light source (22, 23) located in a focal point of the reflector, and wherein the illumination module (1) further comprises
    a horizontal diaphragm (24) arranged on an optical module axis (X), having an optically effective edge facing the lens (30) and configured to produce a cut-off line, wherein
    the lens (30) is divided into two lens portions (30a, 30b), an upper lens portion (30a) and a lower lens portion (30b), wherein the division into lens portions is realized on the light entry surface of the lens, and wherein the lens portions (30a, 30b) are different with respect to their imaging properties,
    and wherein in each lens portion (30a, 30b), light is irradiated only from an illumination unit (2a, 2b) associated with the lens portion (30a, 30b),
    characterized in that
    a focal plane of the lens (30) passes through second focal points of the two reflectors (20, 21), and
    with the upper illumination unit (2a) and the lower lens portion (30b) a dipped beam distribution (LVb, LVb') is generated, and
    with the lower illumination unit (2b) and the upper lens portion (30a) a part of a main beam distribution (LVa, LVa') is generated, and wherein a main beam distribution (LV, LV') is generated when both illumination units (2a, 2b) are activated,
    and wherein, in order to achieve a closed main beam distribution (LV'),
    the upper lens portion (30a) is inclined from the module axis (X) towards the illumination units,
    an optical axis of the lower lens portion (30b) is parallel to the module axis (X), and
    the lens (30) has a flat light entry surface.
  2. Illumination module according to claim 1, characterized in that each lens portion (30a, 30b) is shaped according to a calculation rule, and wherein at least two lens portions (30a, 30b) of the lens (30) are different with respect to their calculation rule.
  3. Illumination module according to claim 1 or 2, characterized in that at least one of the following parameters is used to calculate the imaging properties of the lens portions, for example by using calculation rules:
    *) imaging scale (magnification) of the lens portion;
    *) position or distance of the object plane relative to the lens portion;
    *) position or distance of the object-side focal plane relative to the lens portion;
    *) position or distance of the image plane relative to the lens portion;
    *) focal distance of the lens portion;
    *) orientation of the optical axis of the lens portion;
    *) selection of the aberration to be corrected.
  4. Illumination module according to claim 3, characterized in that the two lens portions (30) differ, as regards the calculation rules underlying them, with respect to at least one of the parameters which enter into the respective calculation rule.
  5. Illumination module according to any one of claims 1 to 4, characterized in that the transition between two adjacent lens portions at the light entrance surface and/or the light exit surface is continuous.
  6. Illumination module according to any one of the claims 1 to 5, characterized in that the transition between two adjacent areas at the light exit surface is discontinuous, for example stepped.
  7. Illumination module according to any one of the claims 1 to 6, characterized in that one, several or all parameters of a calculation rule for a lens portion (30) vary as a function of the position under consideration of the lens portion (30).
  8. Illumination module according to any one of the claims 1 to 7, characterized in that the optical axis of the inclined region (30a) is inclined by about 1.3° from the module axis (X).
  9. Illumination module according to any one of claims 1 to 8, characterized in that the light exit surfaces of the lens portions (30a, 30b) have a discontinuous transition, or their transition is rounded.
  10. Vehicle headlamp having at least one illumination module according to any one of the claims 1 to 9.
EP13708335.8A 2012-02-13 2013-02-12 Lighting module for a motor vehicle Active EP2771613B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ATA50031/2012A AT512468B1 (en) 2012-02-13 2012-02-13 LIGHTING MODULE FOR A MOTOR VEHICLE
PCT/AT2013/050034 WO2013120121A1 (en) 2012-02-13 2013-02-12 Lighting module for a motor vehicle

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EP2771613A1 EP2771613A1 (en) 2014-09-03
EP2771613B1 true EP2771613B1 (en) 2021-04-07

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WO (1) WO2013120121A1 (en)

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CN104040249A (en) 2014-09-10
AT512468A1 (en) 2013-08-15
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WO2013120121A1 (en) 2013-08-22
CN104040249B (en) 2019-11-05
AT512468B1 (en) 2014-01-15

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