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 PDFInfo
- 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
- Authority
- 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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- 230000005855 radiation Effects 0.000 title claims description 9
- 230000003287 optical effect Effects 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 229920003023 plastic Polymers 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 4
- 230000002452 interceptive effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 7
- 239000011521 glass Substances 0.000 description 4
- 238000013021 overheating Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
- F21S41/43—Illuminating 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
- F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
- F21S41/141—Light emitting diodes [LED]
- F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/10—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]
- F21S41/151—Light emitting diodes [LED] arranged in one or more lines
- F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
-
- 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
- F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
- F21S41/32—Optical layout thereof
- F21S41/36—Combinations of two or more separate reflectors
- F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
-
- 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
- F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
- F21S45/10—Protection of lighting devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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
Das Dokument
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
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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 inFig. 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 derFig. 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 derFig. 5 , welcher eine Ablenkstruktur der zweiten Ausführungsform zeigt, -
Fig. 7 ein vergrößertes Detail der Ablenkstruktur derFig. 6 , -
Fig. 8 eine beispielsweise Lichtverteilung eines Scheinwerfers mit einer Abschirmblende nach der zweiten Ausführungsform der Erfindung gemäßFig. 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.
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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 in1 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 the3 , 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 offigure 5 , showing a deflection structure of the second embodiment, -
7 an enlarged detail of the baffle structure of the6 , -
8 an example light distribution of a headlight with a shield according to the second embodiment of the inventionFigures 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
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
Der in den
Der Strahlengang des von der Leuchteinheit 2 emittierten Lichts ist in
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
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
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
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
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
Eine andere Ausgestaltung einer Ablenkstruktur im Rahmen der Erfindung wird nun an Hand der
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
An Hand der
Fig. 10a zeigt nochmals in einem Detail der
Fig. 10d und Fig. 10e zeigen analog zu
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
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.
Claims (11)
- 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. - 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.
- 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).
- 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).
- 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).
- 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).
- 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.
- 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.
- Motor vehicle headlamp according to any one of claims 1 to 8, characterized in that the shielding screen (9) is made of metal.
- Motor vehicle headlamp according to one of claims 1 to 8, characterized in that the shielding screen (9) is made of plastic.
- Motor vehicle headlamp according to claim 9 or 10, characterized in that the shielding cover (9) has a radiation-absorbing coating.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
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 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3752765A1 EP3752765A1 (en) | 2020-12-23 |
EP3752765B1 true EP3752765B1 (en) | 2022-10-26 |
Family
ID=61226477
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18156939.3A Withdrawn EP3527875A1 (en) | 2018-02-15 | 2018-02-15 | Motor vehicle headlamp with a burning lens sheet |
EP19705093.3A Active EP3752765B1 (en) | 2018-02-15 | 2019-01-22 | Motor vehicle headlamp with a shielding screen against incoming solar radiation |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18156939.3A Withdrawn EP3527875A1 (en) | 2018-02-15 | 2018-02-15 | Motor vehicle headlamp with a burning lens sheet |
Country Status (6)
Country | Link |
---|---|
US (1) | US11371671B2 (en) |
EP (2) | EP3527875A1 (en) |
JP (1) | JP7019824B2 (en) |
KR (1) | KR102429313B1 (en) |
CN (1) | CN111699344B (en) |
WO (1) | WO2019158319A1 (en) |
Families Citing this family (9)
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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. |
DE102020101038A1 (en) | 2020-01-17 | 2021-07-22 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Light-emitting component |
JP7530794B2 (en) * | 2020-10-02 | 2024-08-08 | 株式会社小糸製作所 | Lighting unit |
WO2023276256A1 (en) * | 2021-06-30 | 2023-01-05 | 京セラ株式会社 | Lighting device |
JP7113999B1 (en) * | 2021-06-30 | 2022-08-05 | 京セラ株式会社 | lighting equipment |
WO2023001950A1 (en) * | 2021-07-21 | 2023-01-26 | Osram Opto Semiconductors Gmbh | Light emitting diode based lighting device |
JP2023028932A (en) * | 2021-08-20 | 2023-03-03 | 株式会社小糸製作所 | Lighting fixture for drawing |
FR3140928A1 (en) * | 2022-10-04 | 2024-04-19 | Valeo Vision | Light module comprising a plastic housing provided with a part for protecting the plastic housing against the effect of focused light rays |
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JP2003217309A (en) * | 2002-01-23 | 2003-07-31 | Kyocera Corp | Signal light |
DE102005021704A1 (en) | 2005-05-11 | 2006-11-16 | Hella Kgaa Hueck & Co. | Motor vehicle head-lamp, has electric control motor joined to anti-dazzle device for screening plastics component from sun-light |
JP2008243434A (en) | 2007-03-26 | 2008-10-09 | Koito Mfg Co Ltd | Lamp tool unit of vehicle headlight |
CN101298906B (en) * | 2007-11-30 | 2010-09-08 | 上海小糸车灯有限公司 | Automobile front shining lamp based on double-convex lens |
DE102009010558B4 (en) * | 2009-02-13 | 2016-06-09 | Automotive Lighting Reutlingen Gmbh | Light module for a headlight of a motor vehicle and motor vehicle headlight with such a light module |
FR2960497B1 (en) | 2010-05-31 | 2012-07-13 | Valeo Vision | LIGHTING MODULE FOR MOTOR VEHICLE PROJECTOR |
DE102010035767A1 (en) * | 2010-08-20 | 2012-02-23 | Automotive Lighting Reutlingen Gmbh | Projection headlamps with deliberately attenuated light intensity gradients at the cut-off line |
EP2742282A1 (en) | 2011-09-06 | 2014-06-18 | Koninklijke Philips N.V. | Luminaire obliquely oriented |
JP5849754B2 (en) * | 2012-02-14 | 2016-02-03 | 市光工業株式会社 | Vehicle lighting |
FR2987102B1 (en) * | 2012-02-16 | 2014-03-14 | Valeo Vision | PIECE OF A PROJECTOR COMPRISING A REFLECTION MEANS HAVING A REFLECTION COEFFICIENT OF MORE THAN 90% |
US8956029B2 (en) * | 2012-03-23 | 2015-02-17 | Stanley Electric Co., Ltd. | Vehicle lighting unit |
JP2014120275A (en) * | 2012-12-14 | 2014-06-30 | Stanley Electric Co Ltd | Vehicular lighting fixture |
WO2015001733A1 (en) * | 2013-07-01 | 2015-01-08 | 株式会社小糸製作所 | Vehicle headlamp |
DE102013214990A1 (en) * | 2013-07-31 | 2015-02-05 | Automotive Lighting Reutlingen Gmbh | Projection module for a motor vehicle headlight and motor vehicle headlight with such a projection module |
WO2015046346A1 (en) * | 2013-09-26 | 2015-04-02 | 株式会社小糸製作所 | Vehicular lighting fixture control system |
JP6261276B2 (en) * | 2013-10-11 | 2018-01-17 | 株式会社小糸製作所 | Vehicle lighting |
JP2015106460A (en) * | 2013-11-29 | 2015-06-08 | スタンレー電気株式会社 | Projector headlamp |
DE102014200368B4 (en) * | 2014-01-10 | 2016-01-21 | Automotive Lighting Reutlingen Gmbh | Partial remote light projection light module for a motor vehicle headlight |
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AT516836B1 (en) * | 2015-04-10 | 2016-09-15 | Zizala Lichtsysteme Gmbh | Lighting device with beam diaphragm and motor vehicle headlights |
JP6510330B2 (en) * | 2015-06-10 | 2019-05-08 | 株式会社小糸製作所 | Vehicle lighting system |
JP6595258B2 (en) * | 2015-08-26 | 2019-10-23 | 株式会社小糸製作所 | Lamp |
AT517697B1 (en) * | 2015-09-30 | 2017-04-15 | Zkw Group Gmbh | Lighting device for a motor vehicle headlight |
JP6709654B2 (en) * | 2016-03-25 | 2020-06-17 | 株式会社小糸製作所 | Vehicle lamp and vehicle equipped with the vehicle lamp |
JP6866795B2 (en) * | 2017-07-26 | 2021-04-28 | 市光工業株式会社 | Vehicle lighting |
JP6571734B2 (en) * | 2017-09-04 | 2019-09-04 | トヨタ自動車株式会社 | Vehicle lighting device |
-
2018
- 2018-02-15 EP EP18156939.3A patent/EP3527875A1/en not_active Withdrawn
-
2019
- 2019-01-22 CN CN201980013501.4A patent/CN111699344B/en active Active
- 2019-01-22 US US16/969,789 patent/US11371671B2/en active Active
- 2019-01-22 WO PCT/EP2019/051435 patent/WO2019158319A1/en unknown
- 2019-01-22 JP JP2020541891A patent/JP7019824B2/en active Active
- 2019-01-22 KR KR1020207023532A patent/KR102429313B1/en active IP Right Grant
- 2019-01-22 EP EP19705093.3A patent/EP3752765B1/en active Active
Also Published As
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KR102429313B1 (en) | 2022-08-04 |
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 |
JP2021512466A (en) | 2021-05-13 |
WO2019158319A1 (en) | 2019-08-22 |
CN111699344B (en) | 2022-09-30 |
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