EP3752765B1 - Motor vehicle headlamp with a shielding screen against incoming solar radiation - Google Patents

Motor vehicle headlamp with a shielding screen against incoming solar radiation Download PDF

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Publication number
EP3752765B1
EP3752765B1 EP19705093.3A EP19705093A EP3752765B1 EP 3752765 B1 EP3752765 B1 EP 3752765B1 EP 19705093 A EP19705093 A EP 19705093A EP 3752765 B1 EP3752765 B1 EP 3752765B1
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EP
European Patent Office
Prior art keywords
light
motor vehicle
vehicle headlamp
shielding screen
shielding
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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Application number
EP19705093.3A
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German (de)
French (fr)
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EP3752765A1 (en
Inventor
Lukas Taudt
Nina Brauner
Mathias SCHRAGL
Christoph Längauer
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ZKW Group GmbH
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ZKW Group GmbH
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Publication date
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Publication of EP3752765A1 publication Critical patent/EP3752765A1/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • F21S41/143Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141Light emitting diodes [LED]
    • F21S41/151Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25Projection lenses
    • F21S41/255Lenses with a front view of circular or truncated circular outline
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32Optical layout thereof
    • F21S41/36Combinations of two or more separate reflectors
    • F21S41/365Combinations of two or more separate reflectors successively reflecting the light
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21SNON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/10Protection of lighting devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21LIGHTING
    • F21YINDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00Light-generating elements of semiconductor light sources
    • F21Y2115/10Light-emitting diodes [LED]

Definitions

  • the invention relates to a motor vehicle headlight with a substantially flat shielding screen for shielding incoming solar radiation, the shielding screen being arranged between a lighting unit with at least one light source and projection optics, and having a light exit opening for light emitted forwards by the lighting unit, the light emanating from the lighting unit is projected as a light image into the traffic area by means of the projection optics and the shielding screen is outside the focal plane of the projection optics.
  • the solar radiation in connection with optical elements of the headlight can heat up parts inside the headlight so much due to the so-called burning glass effect that irreversible damage occurs.
  • plastic parts can burn or melt, or electronic components can be destroyed. Therefore, various measures have been devised to counteract the harmful magnifying glass effect.
  • the document DE 10 2013 214 990 A1 shows a lens holder in the form of a conical tube, which is provided with a metal coating on the inside in order to prevent this lens holder from being damaged by solar radiation. In order to further reduce the heating of the lens holder, it can also have grooves in the area of the metal coating.
  • a screening screen of the present type is arranged in front of a lighting unit, e.g. which undesirably affects the light image projected onto the road.
  • shielding shade is used in this specification for a cover used to avoid the sun's magnifying glass effect, which cover does not necessarily have to be made of sheet metal. Rather, the cover can also consist of plastics and the shielding screen, whether it is made of metal or plastic, can have a radiation-absorbing coating, so that light or heat radiation is absorbed by the shielding screen.
  • deflection structures are formed at least in regions on the border of the light exit opening of the shielding screen, which lead to deflection of the scattered light emanating from the lighting unit and which is undesirable in the light image.
  • the border of the light exit opening of the shielding screen has a beveled edge as a deflection structure, at least in some areas, with the bevel running across the thickness of the shielding screen being inclined at a predetermined angle in the direction of the optical axis and the lighting unit.
  • Particularly inexpensive and easy to produce is an embodiment in which the border of the light exit opening of the shielding screen is angled at least in regions in the direction of the lighting unit and inclined towards the optical axis at a predetermined angle.
  • deflection structures are designed in the form of a large number of prongs for deflecting interfering marginal rays arriving from the lighting unit. It has proven to be expedient if 20 to 400, in particular 50 to 200, teeth are provided on one side of the border in the longitudinal extension of the light exit opening.
  • the invention is particularly useful in a headlight in which an optical attachment is arranged in the beam path between the light source and the shielding screen.
  • the shielding screen is arranged in front of the focal plane of the projection lens.
  • the invention also offers particular advantages when the light source comprises a number of LEDs arranged in a matrix.
  • the shielding screen is made of metal.
  • the shielding screen is made of plastic.
  • the shielding screen In both cases, it is often advisable for the shielding screen to have a radiation-absorbing coating in order to absorb and not reflect light or heat radiation.
  • a headlight 1 according to the invention can be seen in a schematic view with its components that are essential for explaining the invention, it being clear to the person skilled in the art that a headlight has a large number of other components not shown here, such as adjustment and adjustment devices, electrical supply means and much more. If the term "headlight” is used in connection with the invention, this term should also include individual projection modules, which can also be contained in a superordinate headlight in combination.
  • the headlight 1 has a lighting unit 2 in which a number of LEDs 5 are arranged in a matrix on a printed circuit board 4 as a light source 3 .
  • a lens attachment 6 is arranged in front of the LEDs 5 and is held here on the printed circuit board 4 by means of a holder 7 .
  • the LEDs 5 radiate their light into the light-guiding attachment lens 6, which emits a desired light pattern to the front. This light pattern is projected into the traffic space by means of projection optics 8, which in the present case is a one-piece lens.
  • projection optics 8 Between the projection optics 8 and the lighting unit 2 there is a screening screen 9 for screening incoming solar radiation, in which screen a light exit opening 10 is formed.
  • the individual parts are housed or held in a housing 11 , which is shown here only roughly schematically.
  • the headlight 1 shown corresponds to the prior art in terms of the design of its shielding screen 9 and the problem of the unwanted scattered light occurring here is explained below with reference to a basic beam path.
  • the optical path of the light emitted by the lighting unit 2 is in 2 denoted by Le .
  • This light or the beam path L e runs from the front of the attachment optics 6 through the light exit opening 10 of the shielding screen 9 and through the projection optics 8 into the traffic area in front of the motor vehicle.
  • Sunlight or sunbeams which fall at an angle of approx. 45° in this example, are in 2 marked with Ls.
  • the incident sunbeams are bundled by the projection optics 8 and, if there were no shielding screen 9, would be concentrated on a focal point or focal spot on the front of the attachment optics, where they could cause damage, namely by overheating of components, such as the holder 7, which often made of heat-sensitive plastic. Such overheating can not only lead to damage, such as warping of adjusted elements, but even to local fires up to and including vehicle fires. In this context one speaks of a burning glass effect of the headlight optics.
  • the sun's rays L S will strike the shielding screen, which can be designed to be heat-resistant as well as absorbing and/or reflecting according to its purpose.
  • the shielding screen In 2 the light rays that would reach the light unit 2 without the shielding screen 9 are denoted by L S '.
  • the shielding screen 9 does not influence those rays L e which are intended to generate the light image on the road, in practice the never-perfect attachment optics 6 also emit undesired marginal rays L R which are emitted on the essentially horizontally running inner boundary surface 12 the border 13 of the light exit opening 10 are deflected in the direction of the projection optics 8 as scattered light L RS and reach areas of the light image where they cause undesired artefacts.
  • the invention now provides for deflection structures to be formed at least in regions on the border of the light exit opening of the shielding screen, which lead to a reduction in the scattered light occurring at the border.
  • FIGS. 3 and 4 show a first inventive design of the deflection structures.
  • the light exit opening 10 or its border 13 is formed in the shielding screen 9 in such a way that the beam path generating the desired light image is not cut.
  • the border 13 is angled at a predetermined angle relative to the optical axis a , so that an angled edge region 14 is formed.
  • This angling of the border 13 does not necessarily have to be carried out over the entire border; it is usually sufficient to bend in some areas, preferably in the lower part of the border. Whether the angling runs in the direction of the lighting unit 2 or in the direction of the projection optics 8 is essentially irrelevant, which will be explained in more detail below.
  • the angle must be large enough so that incident marginal rays L R are not directed forwards to the projection optics 8 .
  • the minimum required angle depends on the respective geometry of the arrangement, in particular on the size of the light exit opening of the shielding screen, its thickness and the position of the shielding screen 9 in relation to the exit surface of the front optics.
  • the shielding screen 9 in contrast to screens which define the edges of the light image and should therefore be imaged sharply, is not in the focal plane of the projection optics 8, but outside it, sensibly in front of it. Limitations of the luminous image are determined by the luminous unit 2 or the front optics 6 and not by the light exit opening 10 of the shielding screen 9.
  • An example of a screen in the focal plane of the projection optics can be found in FIG EP 2 742 282 B1 the applicant.
  • a light exit opening 10 with a border 13 is formed in the shielding screen 9, this border having a plurality of prongs 15 in its upper and lower region for deflecting disruptive marginal rays L R arriving from the lighting unit 2.
  • two undesired marginal rays L R arriving from the lighting unit 2 are shown, as well as two light rays L A deflected or scattered at the points 15 .
  • spikes should not necessarily include “pointed” elevations, but very generally elevations, with typically 20 to 400, mostly 50 to 200 such elevations being provided on one longitudinal side of the light exit opening.
  • the approximately rectangular light exit opening 10 of the shielding screen 9 was 80 mm wide and 18 mm high and the prongs 15 had a height and width between 0.5 up to 2 mm.
  • Figures 8 and 9 which show a light distribution measured for a headlight with the exemplary embodiment according to the invention - 8 - or for the same headlight without spikes 15 on the border of the light exit opening 10 - 9 you can see scattered light areas above and below the desired light pattern, of which the upper area is particularly pronounced.
  • the undesired scattered light achieves a maximum light intensity of 162 cd, but 323 cd in a design without spikes.
  • Fig. 10a shows again in a detail 2 the undesired reflection of marginal rays LR as deflected light rays L A forward in the direction of the projection optics.
  • Fig. 10b shows an embodiment in which the border of the shielding screen 9 has a beveled edge 17 at least in regions as a deflection structure, the bevel running across the thickness of the shielding screen 9 being inclined at a predetermined angle in the direction of the optical axis a and the lighting unit.
  • the inclination of this angle is opposite to that according to FIG. 10b, but in both cases the incident marginal rays L R are kept away from the projection optics as deflected light rays L A .
  • Fig. 10d and Fig. 10e show analogous to 4 angled edge areas, the bend 18 in FIG. 10d running backwards in the direction of the lighting unit, but in FIG. 10e forwards to the projection optics.
  • the effect is as can be seen from the course of the rays of the incoming marginal rays L R and the deflected light rays L A however, the deflection structure is comparable in both cases and similar to the bevels of Figures 10b and 10c.
  • Fig. 10f shows an embodiment in which the border is tapered at least in regions in the manner of a cutting edge 19 , the effect of reducing the scattered light being evident here too, since there is no flat area which has marginal rays L R as deflected light rays L A could lead in the direction of the projection optics, rather a beveled edge 17 is effective as in the embodiment according to FIG. 10c.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Description

Die Erfindung bezieht sich auf einen Kraftfahrzeugscheinwerfer mit einer im Wesentlichen flachen Abschirmblende zur Abschirmung eintretender Sonnenstrahlung, wobei die Abschirmblende zwischen einer Leuchteinheit mit zumindest einer Lichtquelle und einer Projektionsoptik angeordnet ist, und sie eine Lichtaustrittsöffnung für von der Leuchteinheit nach vorne abgestrahltes Licht aufweist, wobei das von der Leuchteinheit ausgehende Licht mittels der Projektionsoptik als Lichtbild in den Verkehrsraum projiziert wird und die Abschirmblende außerhalb der Brennebene der Projektionsoptik liegt.The invention relates to a motor vehicle headlight with a substantially flat shielding screen for shielding incoming solar radiation, the shielding screen being arranged between a lighting unit with at least one light source and projection optics, and having a light exit opening for light emitted forwards by the lighting unit, the light emanating from the lighting unit is projected as a light image into the traffic area by means of the projection optics and the shielding screen is outside the focal plane of the projection optics.

Wenn ein Kraftfahrzeug mit seinen Scheinwerfern gegen die Sonne steht kann die Sonneneinstrahlung in Verbindung mit optischen Elementen des Scheinwerfers, wie z.B. Linsen, durch den sogenannten Brennglaseffekt Teile im Inneren des Scheinwerfers so stark erhitzen, dass es zu irreversiblen Schäden kommt. Beispielsweise können Kunststoffteile verschmoren oder schmelzen oder elektronische Bauteile zerstört werden. Daher wurden verschiedene Maßnahmen erdacht, welche dem schädlichen Brennglaseffekt entgegenwirken sollen. Insbesondere versucht man durch besonders gestaltete Blenden die Strahlen einer höherstehenden Sonne unschädlich zu machen, wobei eine Blende dieser Art beispielsweise in der DE 10 2005 021 704 A1 gezeigt und beschrieben ist.If a motor vehicle is standing with its headlights against the sun, the solar radiation in connection with optical elements of the headlight, such as lenses, can heat up parts inside the headlight so much due to the so-called burning glass effect that irreversible damage occurs. For example, plastic parts can burn or melt, or electronic components can be destroyed. Therefore, various measures have been devised to counteract the harmful magnifying glass effect. In particular, one tries to make the rays of a higher sun harmless by specially designed panels, with a panel of this type, for example, in the DE 10 2005 021 704 A1 shown and described.

Das Dokument DE 10 2013 214 990 A1 zeigt eine Linsenhalterung in Form eines konischen Tubus, die innen mit einer Metallbeschichtung versehen ist, um eine Beschädigung dieser Linsenhalterung durch eine Sonneneinstrahlung zu verhindern. Um die Erwärmung der Linsenhalterung weiter zu verringern, kann diese im Bereich der Metallbeschichtung zusätzlich auch Rillen aufweisen.The document DE 10 2013 214 990 A1 shows a lens holder in the form of a conical tube, which is provided with a metal coating on the inside in order to prevent this lens holder from being damaged by solar radiation. In order to further reduce the heating of the lens holder, it can also have grooves in the area of the metal coating.

Ordnet man eine Abschirmblende der gegenständlichen Art vor einer Leuchteinheit, z.B. einem LED-Lichtquellenmodul an, wobei die Abschirmblende eine Lichtaustrittsöffnung für von der Leuchteinheit nach vorne abgestrahltes Licht aufweist, tritt als störender Nebeneffekt an den Rändern der meist aus einem Blech ausgestanzten Lichtaustrittsöffnung Streulicht auf, welches das auf die Straße projizierte Lichtbild unerwünscht beeinflusst. Es sei angemerkt, dass der Begriff die Abschirmblende in dieser Beschreibung für eine Abdeckung verwendet wird, welche zur Vermeidung des Brennglaseffekts der Sonne verwendet wird, wobei diese Abdeckung nicht notwendigerweise aus metallischem Blech gefertigt sein muss. Die Abdeckung kann vielmehr auch aus Kunststoffen bestehen und die Abschirmblende kann, sei sie aus Metall oder aus Kunststoff gefertigt, eine strahlungsabsorbierende Beschichtung aufweisen, sodass Licht bzw. Wärmestrahlung an der Abschirmblende absorbiert werden.If a screening screen of the present type is arranged in front of a lighting unit, e.g. which undesirably affects the light image projected onto the road. It should be noted that the term shielding shade is used in this specification for a cover used to avoid the sun's magnifying glass effect, which cover does not necessarily have to be made of sheet metal. Rather, the cover can also consist of plastics and the shielding screen, whether it is made of metal or plastic, can have a radiation-absorbing coating, so that light or heat radiation is absorbed by the shielding screen.

Es ist eine Aufgabe der Erfindung, diesen Effekt zu vermindern und dadurch die Qualität des Lichtbildes zu verbessern.It is an object of the invention to reduce this effect and thereby improve the quality of the light image.

Diese Aufgabe wird mit einem Kraftfahrzeugscheinwerfer der eingangs genannten Art gelöst, bei welchem erfindungsgemäß an der Umrandung der Lichtaustrittsöffnung der Abschirmblende zumindest bereichsweise Ablenkstrukturen ausgebildet sind, welche zu Ablenkung des von der Leuchteinheit ausgehenden, im Lichtbild unerwünschten Streulichts führen.This object is achieved with a motor vehicle headlight of the type mentioned at the beginning, in which, according to the invention, deflection structures are formed at least in regions on the border of the light exit opening of the shielding screen, which lead to deflection of the scattered light emanating from the lighting unit and which is undesirable in the light image.

Dank der Erfindung wird von der Leuchteinheit bzw. Lichtquelle des Scheinwerfers ausgehendes Licht an der Umrandung der Lichtaustrittsöffnung der Abschirmblende nicht mehr in Richtung der Projektionsoptik reflektiert, wodurch unerwünschtes Streulicht in dem auf die Straße projizierten Lichtbild deutlich verringert werden kann.Thanks to the invention, light emanating from the lighting unit or light source of the headlight is no longer reflected at the border of the light exit opening of the shielding screen in the direction of the projection optics, which means that unwanted scattered light in the light image projected onto the road can be significantly reduced.

Bei einer herstellungstechnisch einfachen Ausführung kann vorgesehen sein, dass die Umrandung der Lichtaustrittsöffnung der Abschirmblende als Ablenkstruktur zumindest bereichsweise eine abgeschrägte Kante aufweist, wobei die über die Dicke der Abschirmblende verlaufende Abschrägung in Richtung der optischen Achse und der Leuchteinheit unter einem vorgegebenen Winkel geneigt ist.In an embodiment that is simple in terms of production technology, it can be provided that the border of the light exit opening of the shielding screen has a beveled edge as a deflection structure, at least in some areas, with the bevel running across the thickness of the shielding screen being inclined at a predetermined angle in the direction of the optical axis and the lighting unit.

Besonders preisgünstig und leicht herzustellen ist eine Ausführung, bei welcher die Umrandung der Lichtaustrittsöffnung der Abschirmblende zumindest bereichsweise in Richtung der Leuchteinheit und gegen die optische Achse geneigt unter einem vorgegebenen Winkel in einer Abwinklung abgewinkelt ist.Particularly inexpensive and easy to produce is an embodiment in which the border of the light exit opening of the shielding screen is angled at least in regions in the direction of the lighting unit and inclined towards the optical axis at a predetermined angle.

Eine andere wirksame Ausbildung der Erfindung zeichnet sich dadurch aus, dass die Ablenkstrukturen in Form einer Vielzahl von Zacken zur Ablenkung störender, von der Leuchteinheit einlangenden Randstrahlen ausgebildet sind. Dabei hat es sich als zweckmäßig herausgestellt, wenn in Längsausdehnung der Lichtaustrittsöffnung 20 bis 400, insbesondere 50 bis 200 Zacken an einer Seite der Umrandung vorgesehen sind.Another effective embodiment of the invention is characterized in that the deflection structures are designed in the form of a large number of prongs for deflecting interfering marginal rays arriving from the lighting unit. It has proven to be expedient if 20 to 400, in particular 50 to 200, teeth are provided on one side of the border in the longitudinal extension of the light exit opening.

Die Erfindung ist besonders zweckmäßig bei einem Scheinwerfer, bei welchem zwischen der Lichtquelle und der Abschirmblende eine Vorsatzoptik im Strahlengang angeordnet ist.The invention is particularly useful in a headlight in which an optical attachment is arranged in the beam path between the light source and the shielding screen.

Aus optischer und abbildungstechnisch vorteilhafter Sicht ist es günstig, wenn die Abschirmblende vor der Brennebene der Projektionslinse angeordnet ist.From an optical and imaging point of view, it is advantageous if the shielding screen is arranged in front of the focal plane of the projection lens.

Die Erfindung bietet auch besondere Vorteile, wenn die Lichtquelle eine Anzahl von in einer Matrix angeordneter LEDs umfasst.The invention also offers particular advantages when the light source comprises a number of LEDs arranged in a matrix.

Bei einer praxisbewährten Ausbildung besteht die Abschirmblende aus Metall. Andererseits kann es in anderen Fällen von Vorteil sei, wenn die Abschirmblende aus Kunststoff besteht.In a practice-proven training, the shielding screen is made of metal. On the other hand, it can be advantageous in other cases if the shielding screen is made of plastic.

In beiden Fällen ist es oft empfehlenswert, wenn die Abschirmblende eine strahlungsabsorbierende Beschichtung aufweist, um Licht- bzw. Wärmestrahlung zu absorbieren und nicht zu reflektieren.In both cases, it is often advisable for the shielding screen to have a radiation-absorbing coating in order to absorb and not reflect light or heat radiation.

Die Erfindung samt weiteren Vorteilen und ihren Unterschieden zum Stand der Technik ist im Folgenden auch an Hand von Ausführungsbeispielen näher erläutert und in der Zeichnung veranschaulicht. In dieser zeigen

  • Fig. 1 schematisch und in schaubildlicher Darstellung Komponenten eines Scheinwerfers, nämlich eine Leuchteinheit mit vorgesetzter Abschirmblende zur Abschirmung eintretender Sonnenstrahlung und einer Projektionslinse,
  • Fig. 2 einen schematischen Schnitt durch einen Scheinwerfer der gegenständlichen Art mit den in Fig. 1 dargestellten Komponenten, wobei einige wesentliche Strahlengänge eingezeichnet sind,
  • Fig. 3 eine Ansicht einer Abschirmblende einer ersten Ausführungsform der Erfindung von vorne,
  • Fig. 4 einen Schnitt nach der Linie IV-IV der Fig. 3, welcher eine Ablenkstruktur der ersten Ausführungsform zeigt,
  • Fig. 5 eine Ansicht einer Abschirmblende einer zweiten Ausführungsform der Erfindung von vorne,
  • Fig. 6 einen Schnitt nach der Linie VI-VI der Fig. 5, welcher eine Ablenkstruktur der zweiten Ausführungsform zeigt,
  • Fig. 7 ein vergrößertes Detail der Ablenkstruktur der Fig. 6,
  • Fig. 8 eine beispielsweise Lichtverteilung eines Scheinwerfers mit einer Abschirmblende nach der zweiten Ausführungsform der Erfindung gemäß Fig. 5 bis 7,
  • Fig. 9 eine beispielsweise Lichtverteilung eines Scheinwerfers mit einer Abschirmblende nach dem Stand der Technik und
  • Fig. 10a bis 10f Schnitte analog zu Fig. 4 durch unterschiedlich ausgebildete Abschirmblenden, wobei Fig. 10a den Stand der Technik und Fig. 10b bis 10f Ausführungsformen gemäß der Erfindung zeigen.
The invention, together with further advantages and its differences from the prior art, is explained in more detail below using exemplary embodiments and illustrated in the drawing. in this show
  • 1 schematic and diagrammatic representation of components of a headlight, namely a lighting unit with a shielding screen in front for shielding incoming solar radiation and a projection lens,
  • 2 a schematic section through a headlight of the present type with the in 1 components shown, whereby some essential beam paths are drawn,
  • 3 a front view of a shielding screen of a first embodiment of the invention,
  • 4 a cut along line IV-IV of the 3 , showing a deflection structure of the first embodiment,
  • figure 5 a view of a screening screen of a second embodiment of the invention from the front,
  • 6 a cut along line VI-VI of figure 5 , showing a deflection structure of the second embodiment,
  • 7 an enlarged detail of the baffle structure of the 6 ,
  • 8 an example light distribution of a headlight with a shield according to the second embodiment of the invention Figures 5 to 7 ,
  • 9 an example light distribution of a headlight with a screening screen according to the prior art and
  • 10a to 10f sections analogous to 4 by differently designed shielding screens, with FIG. 10a showing the prior art and FIGS. 10b to 10f showing embodiments according to the invention.

In den Darstellungen nach Fig. 1 und Fig. 2 erkennt man in schematischer Ansicht einen Scheinwerfer 1 nach der Erfindung mit seinen für die Erläuterung der Erfindung wesentlichen Bestandteilen, wobei es für den Fachmann klar ist, dass ein Schweinwerfer eine Vielzahl weiterer, hier nicht gezeigter Bestandteile besitzt, wie Ein- und Verstelleinrichtungen, elektrische Versorgungsmittel und vieles mehr. Wenn im Zusammenhang mit der Erfindung der Begriff "Scheinwerfer" verwendet wird, so soll dieser Begriff auch einzelne Projektionsmodule beinhalten, die auch in Kombination in einem übergeordneten Scheinwerfer enthalten sein können.In the representations after 1 and 2 a headlight 1 according to the invention can be seen in a schematic view with its components that are essential for explaining the invention, it being clear to the person skilled in the art that a headlight has a large number of other components not shown here, such as adjustment and adjustment devices, electrical supply means and much more. If the term "headlight" is used in connection with the invention, this term should also include individual projection modules, which can also be contained in a superordinate headlight in combination.

In diesen und den folgenden Figuren werden für gleiche oder vergleichbare Elemente zum Zwecke der einfacheren Erläuterung und Darstellung gleiche Bezugszeichen verwendet.In these and the following figures, the same reference numbers are used for the same or comparable elements for the purpose of simpler explanation and illustration.

Die in den Ansprüchen verwendeten Bezugszeichen sollen lediglich die Lesbarkeit der Ansprüche und das Verständnis der Erfindung erleichtern und haben keinesfalls einen den Schutzumfang der Erfindung beeinträchtigenden Charakter.The reference signs used in the claims are only intended to facilitate the legibility of the claims and the understanding of the invention and in no way have any character affecting the protective scope of the invention.

Begriffe hinsichtlich des Ortes oder einer Orientierung, wie beispielsweise "oben", "unten", "vorne", "darunter", "darüber" etc. werden in der Beschreibung lediglich zur Vereinfachung gewählt und beziehen sich möglicherweise auf die Darstellung in der Zeichnung nicht jedoch notwendigerweise auf eine Gebrauchs- oder Einbaulage.Terms of location or orientation, such as "top", "bottom", "front", "below", "above", etc., are used in the description for convenience only and may not relate to the depiction in the drawing however, necessarily to a position of use or installation.

Der Scheinwerfer 1 besitzt eine Leuchteinheit 2, bei welcher als Lichtquelle 3 auf einer Leiterplatte 4 eine Anzahl von LEDs 5 in einer Matrix angeordnet ist. Den LEDs 5 ist eine Vorsatzoptik 6 vorgeordnet, die mittels einer Halterung 7 hier an der Leiterplatte 4 gehalten ist. Die LEDs 5 strahlen ihr Licht in die lichtleitende Vorsatzoptik 6, welche nach vorne ein gewünschtes Lichtmuster abgibt. Dieses Lichtmuster wird mittels einer Projektionsoptik 8, welche im vorliegenden Fall eine einstückige Linse ist, in den Verkehrsraum projiziert. Zwischen der Projektionsoptik 8 und der Leuchteinheit 2 ist eine Abschirmblende 9 zur Abschirmung eintretender Sonnenstrahlung angeordnet, in welchem eine Lichtaustrittsöffnung 10 ausgebildet ist. In Fig. 2 erkennt man, dass die einzelnen Teile in einem hier nur grob schematisch dargestellten Gehäuse 11 untergebracht bzw. gehalten sind.The headlight 1 has a lighting unit 2 in which a number of LEDs 5 are arranged in a matrix on a printed circuit board 4 as a light source 3 . A lens attachment 6 is arranged in front of the LEDs 5 and is held here on the printed circuit board 4 by means of a holder 7 . The LEDs 5 radiate their light into the light-guiding attachment lens 6, which emits a desired light pattern to the front. This light pattern is projected into the traffic space by means of projection optics 8, which in the present case is a one-piece lens. Between the projection optics 8 and the lighting unit 2 there is a screening screen 9 for screening incoming solar radiation, in which screen a light exit opening 10 is formed. In 2 it can be seen that the individual parts are housed or held in a housing 11 , which is shown here only roughly schematically.

Der in den Fig. 1 und 2 dargestellte Scheinwerfer 1 entspricht hinsichtlich der Ausführung seiner Abschirmblende 9 dem Stand der Technik und es wird im Folgenden an Hand eines prinzipiellen Strahlenganges die Problematik des hier auftretenden unerwünschten Streulichts erläutert.The in the Figures 1 and 2 The headlight 1 shown corresponds to the prior art in terms of the design of its shielding screen 9 and the problem of the unwanted scattered light occurring here is explained below with reference to a basic beam path.

Der Strahlengang des von der Leuchteinheit 2 emittierten Lichts ist in Fig. 2 mit Le bezeichnet. Dieses Licht bzw. der Strahlengang Le verläuft von der Vorderseite der Vorsatzoptik 6 durch die Lichtaustrittsöffnung 10 der Abschirmblende 9 und durch die Projektionsoptik 8 in den Verkehrsraum vor dem Kraftfahrzeug. Sonnenlicht bzw. Sonnenstrahlen, die bei diesem Beispiel unter einem Winkel von ca. 45° einfallen, sind in Fig. 2 mit Ls bezeichnet. Die einfallenden Sonnenstrahlen werden durch die Projektionsoptik 8 gebündelt und würden bei Fehlen der Abschirmblende 9 konzentriert auf einen Brennpunkt bzw. Brennfleck auf die Vorderseite der Vorsatzoptik auftreffen, wo sie Schaden anrichten könnten, nämlich durch Überhitzung von Bauteilen, wie beispielsweise der Halterung 7, die oft aus wärmeempfindlichem Kunststoff besteht. Durch eine solche Überhitzung kann es nicht nur zu Beschädigungen, wie z.B. einem Verziehen justierter Elemente kommen, sondern sogar zu lokalen Bränden bis hin zu Fahrzeugbränden. Man spricht in diesem Zusammenhang von einem Brennglaseffekt der Scheinwerferoptik.The optical path of the light emitted by the lighting unit 2 is in 2 denoted by Le . This light or the beam path L e runs from the front of the attachment optics 6 through the light exit opening 10 of the shielding screen 9 and through the projection optics 8 into the traffic area in front of the motor vehicle. Sunlight or sunbeams, which fall at an angle of approx. 45° in this example, are in 2 marked with Ls. The incident sunbeams are bundled by the projection optics 8 and, if there were no shielding screen 9, would be concentrated on a focal point or focal spot on the front of the attachment optics, where they could cause damage, namely by overheating of components, such as the holder 7, which often made of heat-sensitive plastic. Such overheating can not only lead to damage, such as warping of adjusted elements, but even to local fires up to and including vehicle fires. In this context one speaks of a burning glass effect of the headlight optics.

Falls die Sonne nicht zu tief steht, werden die Sonnenstrahlen LS jedoch auf die Abschirmblende auftreffen, die ihrem Zweck entsprechend hitzefest sowie absorbierend und/oder reflektierend ausgebildet sein kann. In Fig. 2 sind die Lichtstrahlen, die ohne Abschirmblende 9 bis zu der Lichteinheit 2 gelangen würden, mit L S' bezeichnet.However, if the sun is not too low, the sun's rays L S will strike the shielding screen, which can be designed to be heat-resistant as well as absorbing and/or reflecting according to its purpose. In 2 the light rays that would reach the light unit 2 without the shielding screen 9 are denoted by L S '.

Die Abschirmblende 9 beeinflusst zwar nicht jene Strahlen Le, welche das Lichtbild auf der Straße erzeugen sollen, doch gehen in der Praxis von der niemals vollkommenen Vorsatzoptik 6 auch an sich unerwünschte Randstrahlen LR aus, welche an der im Wesentlichen horizontal verlaufenden inneren Begrenzungsfläche 12 der Umrandung 13 der Lichtaustrittsöffnung 10 in Richtung der Projektionsoptik 8 als Streulicht LRS abgelenkt werden und in Bereiche des Lichtbildes gelangen, wo sie unerwünschte Artefakte verursachen.Although the shielding screen 9 does not influence those rays L e which are intended to generate the light image on the road, in practice the never-perfect attachment optics 6 also emit undesired marginal rays L R which are emitted on the essentially horizontally running inner boundary surface 12 the border 13 of the light exit opening 10 are deflected in the direction of the projection optics 8 as scattered light L RS and reach areas of the light image where they cause undesired artefacts.

Um diesem Problem zu begegnen, sieht die Erfindung nun vor, zumindest bereichsweise Ablenkstrukturen an der Umrandung der Lichtaustrittsöffnung der Abschirmblende auszubilden, welche zu einer Verminderung des an der Umrandung entstehenden Streulichts führen.In order to counteract this problem, the invention now provides for deflection structures to be formed at least in regions on the border of the light exit opening of the shielding screen, which lead to a reduction in the scattered light occurring at the border.

Dazu wird nun auf Fig. 3 und 4 verwiesen, welche eine erste erfindungsgemäße Gestaltung der Ablenkstrukturen zeigen. Gemäß Fig. 3 ist in der Abschirmblende 9 die Lichtaustrittsöffnung 10 bzw. deren Umrandung 13 so ausgebildet, dass der das gewünschte Lichtbild erzeugende Strahlengang nicht beschnitten wird. Im Schnitt der Fig. 4 erkennt man nun, dass die Umrandung 13 gegen die optische Achse a geneigt unter einem vorgegebenen Winkel abgewinkelt ist, sodass ein abgewinkelter Kantenbereich 14 entsteht. Dieses Abwinkeln der Umrandung 13 muss nicht notwendigerweise über die gesamte Umrandung vorgenommen werden, es genügt meist eine bereichsweise Abwinklung, vorzugsweise im unteren Teilbereich der Umrandung. Ob die Abwinklung in Richtung der Leuchteinheit 2 oder in Richtung der Projektionsoptik 8 verläuft, ist im Wesentlichen ohne Bedeutung, was weiter unten noch genauer erläutert wird. Im Schnitt der Fig. 4 erkennt man das der Erfindung zugrunde liegende Prinzip, das darin besteht, dass von der Leuchteinheit 2 bzw. deren Vorsatzoptik 6 einfallende Randstrahlen LR an der nun nicht mehr horizontal verlaufenden inneren Begrenzungsfläche 12 der Umrandung 13 der Lichtaustrittsöffnung 10 nicht mehr in Richtung der Projektionsoptik reflektiert werden, sondern im vorliegenden Fall nach hinten in Richtung der Leuchteinheit. Unerwünschte Lichtartefakte im Lichtbild auf Grund der Randstrahlen LR werden dadurch vermieden.This will now open Figures 3 and 4 referenced, which show a first inventive design of the deflection structures. According to 3 the light exit opening 10 or its border 13 is formed in the shielding screen 9 in such a way that the beam path generating the desired light image is not cut. On average the 4 one can now see that the border 13 is angled at a predetermined angle relative to the optical axis a , so that an angled edge region 14 is formed. This angling of the border 13 does not necessarily have to be carried out over the entire border; it is usually sufficient to bend in some areas, preferably in the lower part of the border. Whether the angling runs in the direction of the lighting unit 2 or in the direction of the projection optics 8 is essentially irrelevant, which will be explained in more detail below. On average the 4 the principle on which the invention is based can be seen, which consists in the fact that marginal rays L R incident from the lighting unit 2 or its attachment optics 6 are no longer reflected in the direction of the projection optics on the inner boundary surface 12 of the border 13 of the light exit opening 10, which is now no longer horizontal be, but in the present case to the rear in the direction of the lighting unit. Undesirable light artefacts in the light image due to the edge rays L R are thereby avoided.

Was das Ausmaß der Abwinklung betrifft, so muss deren Winkel groß genug sein, damit auftreffende Randstrahlen LR nicht nach vorne zur Projektionsoptik 8 gelenkt werden. Der minimal notwendige Winkel hängt von der jeweiligen Geometrie der Anordnung ab, insbesondere von der Größe der Lichtaustrittsöffnung der Abschirmblende, von deren Dicke und von der Position der Abschirmblende 9 in Bezug zur Austrittsfläche der Vorsatzoptik.As far as the extent of the angling is concerned, its angle must be large enough so that incident marginal rays L R are not directed forwards to the projection optics 8 . The minimum required angle depends on the respective geometry of the arrangement, in particular on the size of the light exit opening of the shielding screen, its thickness and the position of the shielding screen 9 in relation to the exit surface of the front optics.

Es soll darauf hingewiesen werden, dass die Abschirmblende 9 im Gegensatz zu Blenden, welche Umrandungen des Leuchtbild festlegen und daher scharf abgebildet werden sollen, nicht in der Brennebene der Projektionsoptik 8 liegt, sondern außerhalb, in sinnvoller Weise vor dieser. Begrenzungen des Leuchtbilds werden durch die Leuchteinheit 2 bzw. die Vorsatzoptik 6 bestimmt und nicht durch die Lichtaustrittsöffnung 10 der Abschirmblende 9. Ein Beispiel für eine Blende in der Brennebene der Projektionsoptik findet sich in der EP 2 742 282 B1 der Anmelderin.It should be pointed out that the shielding screen 9, in contrast to screens which define the edges of the light image and should therefore be imaged sharply, is not in the focal plane of the projection optics 8, but outside it, sensibly in front of it. Limitations of the luminous image are determined by the luminous unit 2 or the front optics 6 and not by the light exit opening 10 of the shielding screen 9. An example of a screen in the focal plane of the projection optics can be found in FIG EP 2 742 282 B1 the applicant.

Eine andere Ausgestaltung einer Ablenkstruktur im Rahmen der Erfindung wird nun an Hand der Fig. 5, 6 und 7 erläutert. Auch hier ist in der Abschirmblende 9 eine Lichtaustrittsöffnung 10 mit einer Umrandung 13 ausgebildet, wobei diese Umrandung in ihrem oberen und in ihrem unteren Bereich eine Vielzahl von Zacken 15 zur Ablenkung störender, von der Leuchteinheit 2 einlangender Randstrahlen LR aufweist. Man kann auch, wenn man die vergrößerte Darstellung der Fig. 7 betrachtet, von einem gewellten Rand sprechen, der abwechselnd Zacken 15 und Rillen 16 aufweist. In den Fig. 5 bis 7 sind je zwei von der Leuchteinheit 2 einlangende unerwünschte Randstrahlen LR eingezeichnet sowie zwei an den Zacken 15 abgelenkte oder gestreute Lichtstrahlen LA. Die meisten dieser abgelenkten Lichtstrahlen LA gelangen nicht zur Projektionsoptik 8, sodass sie auch keine Störungen im Lichtbild erzeugen können. Wie man der Fig. 7 entnehmen kann, soll der Begriff "Zacken" nicht notwendigerweise "spitze" Erhebungen, sondern ganz allgemein Erhebungen beinhalten, wobei typischerweise auf einer Längsseite der Lichtaustrittsöffnung 20 bis 400, meist 50 bis 200 solcher Erhebungen vorgesehen sind.Another embodiment of a deflection structure in the context of the invention will now be based on the Figures 5, 6 and 7 explained. Here, too, a light exit opening 10 with a border 13 is formed in the shielding screen 9, this border having a plurality of prongs 15 in its upper and lower region for deflecting disruptive marginal rays L R arriving from the lighting unit 2. You can also, if you look at the enlarged view of the 7 viewed, speak of a wavy edge, which has alternating spikes 15 and 16 grooves. In the Figures 5 to 7 two undesired marginal rays L R arriving from the lighting unit 2 are shown, as well as two light rays L A deflected or scattered at the points 15 . Most of these deflected light beams L A do not reach the projection optics 8, so that they cannot produce any disturbances in the light image. How to 7 can be seen, the term “spikes” should not necessarily include “pointed” elevations, but very generally elevations, with typically 20 to 400, mostly 50 to 200 such elevations being provided on one longitudinal side of the light exit opening.

Um ein praktisches Beispiel zu geben, das im Rahmen der Erfindung realisiert wurde, sei angegeben, dass bei einem Beispiel die annähernd rechteckförmige Lichtaustrittsöffnung 10 der Abschirmblende 9 80 mm breit und 18 mm hoch war und die Zacken 15 eine Höhe und Breite zwischen 0,5 bis 2 mm aufwiesen. An Hand der Fig. 8 und 9 , welche eine für einen Scheinwerfer mit der erfindungsgemäßen beispielsweisen Ausführung gemessene Lichtverteilung zeigen - Fig. 8 - bzw. für den gleichen Scheinwerfer ohne Zacken 15 an der Umrandung der Lichtaustrittsöffnung 10 - Fig. 9 erkennt man Streulichtbereiche oberhalb und unterhalb des gewünschten Lichtbilds, von welchen der obere Bereich besonders stark ausgeprägt ist. Bei Anwendung der beschriebenen erfindungsgemäßen Ausbildung mit Zacken an der Umrandung - Fig. 8 - erreicht das unerwünschte Streulicht eine maximale Lichtstärke von 162 cd, bei einer Ausbildung ohne Zacken jedoch 323 cd.To give a practical example that was realized within the framework of the invention, it should be stated that in one example the approximately rectangular light exit opening 10 of the shielding screen 9 was 80 mm wide and 18 mm high and the prongs 15 had a height and width between 0.5 up to 2 mm. Based on Figures 8 and 9 , which show a light distribution measured for a headlight with the exemplary embodiment according to the invention - 8 - or for the same headlight without spikes 15 on the border of the light exit opening 10 - 9 you can see scattered light areas above and below the desired light pattern, of which the upper area is particularly pronounced. When using the training described according to the invention with spikes on the border - 8 - the undesired scattered light achieves a maximum light intensity of 162 cd, but 323 cd in a design without spikes.

An Hand der Fig. 10 a bis f sollen noch verschiedene Ausbildungen zum Teil noch nicht erörterter Varianten der Erfindung erläutert werden.Based on 10 a to f , various embodiments of the invention, some of which have not yet been discussed, will be explained.

Fig. 10a zeigt nochmals in einem Detail der Fig. 2 die unerwünschte Reflexion von Randstrahlen LR als abgelenkte Lichtstrahlen LA nach vorne in Richtung der Projektionsoptik. Fig. 10b zeigt eine Ausbildung, bei welcher die Umrandung der Abschirmblende 9 als Ablenkstruktur zumindest bereichsweise eine abgeschrägte Kante 17 aufweist, wobei die über die Dicke der Abschirmblende 9 verlaufende Abschrägung in Richtung der optischen Achse a und der Leuchteinheit unter einem vorgegebenen Winkel geneigt ist. Dabei ist in der folgenden Fig. 10c die Neigung dieses Winkels entgegengesetzt zu jener nach Fig. 10b, doch in beiden Fällen werden die einlangenden Randstrahlen LR als abgelenkte Lichtstrahlen LA von der Projektionsoptik ferngehalten.Fig. 10a shows again in a detail 2 the undesired reflection of marginal rays LR as deflected light rays L A forward in the direction of the projection optics. Fig. 10b shows an embodiment in which the border of the shielding screen 9 has a beveled edge 17 at least in regions as a deflection structure, the bevel running across the thickness of the shielding screen 9 being inclined at a predetermined angle in the direction of the optical axis a and the lighting unit. In the following FIG. 10c, the inclination of this angle is opposite to that according to FIG. 10b, but in both cases the incident marginal rays L R are kept away from the projection optics as deflected light rays L A .

Fig. 10d und Fig. 10e zeigen analog zu Fig. 4 abgewinkelte Kantenbereiche, wobei die Abwinklung 18 in Fig. 10d in Richtung der Leuchteinheit nach hinten verläuft, in Fig. 10e jedoch nach vorne zu der Projektionsoptik. Wie man an dem Strahlenverlauf der einlangenden Randstrahlen LR und der abgelenkten Lichtstrahlen LA erkennt, ist die Wirkung der Ablenkstruktur jedoch in beiden Fällen vergleichbar und ähnlich wie bei den Abschrägungen der Fig. 10b und Fig. 10c.Fig. 10d and Fig. 10e show analogous to 4 angled edge areas, the bend 18 in FIG. 10d running backwards in the direction of the lighting unit, but in FIG. 10e forwards to the projection optics. The effect is as can be seen from the course of the rays of the incoming marginal rays L R and the deflected light rays L A however, the deflection structure is comparable in both cases and similar to the bevels of Figures 10b and 10c.

Schließlich zeigt Fig. 10f eine Ausbildung, bei welcher die Umrandung zumindest bereichsweise nach Art einer Schneide 19 verjüngt ist, wobei auch hier der Effekt einer Verminderung des Streulichts ersichtlich ist, da es keinen flächigen Bereich gibt, welcher Randstrahlen LR als abgelenkte Lichtstrahlen LA in Richtung der Projektionsoptik führen könnte, vielmehr eine abgeschrägte Kante 17 wie bei der Ausführung nach Fig. 10c wirksam ist.Finally, Fig. 10f shows an embodiment in which the border is tapered at least in regions in the manner of a cutting edge 19 , the effect of reducing the scattered light being evident here too, since there is no flat area which has marginal rays L R as deflected light rays L A could lead in the direction of the projection optics, rather a beveled edge 17 is effective as in the embodiment according to FIG. 10c.

Wenngleich im Rahmen dieser Beschreibung der Erfindung eine spezielle Leuchteinheit 2 dargestellt und beschrieben wurde, nämlich eine Leuchteinheit für einen sogenannten "Matrix-Scheinwerfer" mit einer größeren Anzahl von LEDs und einer Vorsatzoptik mit Lichtleitern, soll es klar sein, dass die Erfindung keineswegs auf eine bestimmte Leuchteinheit eingeschränkt ist. Es ist weder eine Vorsatzoptik noch eine matrixartige Anordnung von LEDs für die Realisierung der Erfindung erforderlich, ebenso wie an Stelle von LEDs andere Leuchtmittel, wie Laserdioden mit Lichtkonvertern, diese auch mit scannenden Laserstrahlen, Gasentladungslampen und dgl. mehr zum Einsatz kommen können. Liste der Bezugszeichen 1 Scheinwerfer LA abgelenkte Lichtstrahlen 2 Leuchteinheit Le Strahlengang 3 Lichtquelle LR Randstrahlen 4 Leiterplatte LRS Streulicht 5 LEDs LS Sonnenstrahlen 6 Vorsatzoptik 7 Halterung 8 Projektionsoptik 9 Abschirmblende 10 Lichtaustrittsöffnung 11 Gehäuse 12 Begrenzungsfläche 13 Umrandung 14 abgewinkelter Kantenbereich 15 Zacken 16 Rillen 17 abgeschrägte Kante 18 Abwinklung 19 Schneide Although a special lighting unit 2 has been illustrated and described in this description of the invention, namely a lighting unit for a so-called "matrix headlight" with a larger number of LEDs and an attachment optics with light guides, it should be clear that the invention is by no means limited to a specific lighting unit is restricted. Neither an attachment optics nor a matrix-like arrangement of LEDs is required for the realization of the invention, just as instead of LEDs other illuminants such as laser diodes with light converters, these can also be used with scanning laser beams, gas discharge lamps and the like. <b>List of reference characters</b> 1 headlight L A deflected rays of light 2 lighting unit L e beam path 3 light source L R marginal rays 4 circuit board LRS scattered light 5 LEDs L S Sunbeams 6 attachment optics 7 bracket 8th projection optics 9 shielding screen 10 light exit opening 11 Housing 12 boundary surface 13 border 14 angled edge area 15 Pink 16 grooves 17 beveled edge 18 deflection 19 cutting edge

Claims (11)

  1. Motor vehicle headlamp having a substantially flat shielding screen (9) for shielding incoming solar radiation, the shielding screen being arranged between a lighting unit (2) having at least one light source (3) and a projection optical system (8) and it has a light exit opening (10) for light emitted forwards by the luminaire unit, the light emitted by the luminaire unit being projected as a light image into the traffic area by means of the projection optics, and the screening screen being located outside the focal plane of the projection optics,
    characterized in that
    deflecting structures (14, 15, 16, 17, 18, 19) are formed at least in regions on the border (13) of the light exit opening (10) of the shielding screen (9), which structures lead to a deflection of the stray light which emanates from the light unit and is undesirable in the light image.
  2. Motor vehicle headlamp according to claim 1, characterized in that the border (13) of the light exit opening (10) of the shielding screen (9) has, at least in regions, a beveled edge (17) as a deflecting structure, the bevel extending over the thickness of the shielding screen being inclined at a predetermined angle in the direction of the optical axis and of the light unit.
  3. Motor vehicle headlamp according to claim 1, characterized in that the rim (13) of the light exit opening (10) of the shielding screen (9) is inclined at least in regions towards the optical axis (a) at a predetermined angle in a bend (18).
  4. Motor vehicle headlamp according to claim 1, characterized in that the deflecting structures are designed in the form of a plurality of prongs (15) for deflecting interfering edge beams (LR) arriving from the light unit (2).
  5. Motor vehicle headlamp according to claim 4, characterized in that 20 to 400, in particular 50 to 200, prongs (15) are provided on one side of the surround (13) in the longitudinal extent of the light exit opening (10).
  6. Motor vehicle headlamp according to one of claims 1 to 5, characterized in that an optical attachment (7) is arranged in the beam path between the light source (3) and the shielding screen (9).
  7. Motor vehicle headlamp according to one of claims 1 to 6, characterized in that the shielding diaphragm (9) is arranged in front of the focal plane of the projection lens.
  8. Motor vehicle headlamp according to one of claims 1 to 7, characterized in that the light source (3) comprises a number of LEDs (5) arranged in a matrix.
  9. Motor vehicle headlamp according to any one of claims 1 to 8, characterized in that the shielding screen (9) is made of metal.
  10. Motor vehicle headlamp according to one of claims 1 to 8, characterized in that the shielding screen (9) is made of plastic.
  11. Motor vehicle headlamp according to claim 9 or 10, characterized in that the shielding cover (9) has a radiation-absorbing coating.
EP19705093.3A 2018-02-15 2019-01-22 Motor vehicle headlamp with a shielding screen against incoming solar radiation Active EP3752765B1 (en)

Applications Claiming Priority (2)

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EP18156939.3A EP3527875A1 (en) 2018-02-15 2018-02-15 Motor vehicle headlamp with a burning lens sheet
PCT/EP2019/051435 WO2019158319A1 (en) 2018-02-15 2019-01-22 Motor vehicle headlamp having a shielding screen for shielding incident solar radiation

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EP3752765A1 EP3752765A1 (en) 2020-12-23
EP3752765B1 true EP3752765B1 (en) 2022-10-26

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EP19705093.3A Active EP3752765B1 (en) 2018-02-15 2019-01-22 Motor vehicle headlamp with a shielding screen against incoming solar radiation

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EP (2) EP3527875A1 (en)
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FR3105350B1 (en) * 2019-12-18 2022-12-16 Valeo Vision Light module for motor vehicle.
FR3105351B1 (en) * 2019-12-18 2022-12-16 Valeo Vision Motor vehicle light module.
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EP3527875A1 (en) 2019-08-21
CN111699344A (en) 2020-09-22
EP3752765A1 (en) 2020-12-23
KR20200110680A (en) 2020-09-24
JP7019824B2 (en) 2022-02-15
US11371671B2 (en) 2022-06-28
US20210003263A1 (en) 2021-01-07
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WO2019158319A1 (en) 2019-08-22
CN111699344B (en) 2022-09-30

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