EP3527875A1 - Motor vehicle headlamp with a burning lens sheet - Google Patents
Motor vehicle headlamp with a burning lens sheet Download PDFInfo
- Publication number
- EP3527875A1 EP3527875A1 EP18156939.3A EP18156939A EP3527875A1 EP 3527875 A1 EP3527875 A1 EP 3527875A1 EP 18156939 A EP18156939 A EP 18156939A EP 3527875 A1 EP3527875 A1 EP 3527875A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- light
- glass sheet
- motor vehicle
- vehicle headlight
- headlight according
- 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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- 238000013021 overheating Methods 0.000 description 2
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- 230000002427 irreversible effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
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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 burning glass sheet, which is arranged between a lighting unit with at least one light source and a projection optics, and which has a light exit opening for light emitted from the light unit forward, wherein the outgoing light from the light unit by means of the projection optics Photograph is projected into the traffic space and the burning glass sheet is located outside the focal plane of the projection optics.
- a burning glass sheet is placed in front of a lighting unit, e.g. an LED light source module, wherein the burning glass sheet has a light exit opening for the light emitted from the light unit forward, occurs as a disturbing side effect at the edges of the most punched out of a sheet of light exit light scattered light, which affects the projected onto the street photograph undesirable.
- a lighting unit e.g. an LED light source module
- the burning glass sheet has a light exit opening for the light emitted from the light unit forward, occurs as a disturbing side effect at the edges of the most punched out of a sheet of light exit light scattered light, which affects the projected onto the street photograph undesirable.
- the term "burning glass sheet" in this specification is used for a cover which is used for avoiding the burning effect of the sun, which cover need not necessarily be made of metallic sheet. Rather, the cover can also be made of plastics and the firing glass sheet can, whether made of metal or plastic, have a radiation-absorbing coating, so that light or heat radiation are absorbed on the
- outgoing light from the light unit or light source of the headlight is no longer reflected at the border of the light exit opening of the combustion glass sheet in the direction of the projection optics, whereby unwanted scattered light can be significantly reduced in the projected onto the street photo.
- the border of the light exit opening of the Brennglasbleches as deflecting at least partially has a beveled edge, wherein over the thickness of the firing plate extending bevel in the direction of the optical axis and the lighting unit is inclined at a predetermined angle.
- Particularly inexpensive and easy to manufacture is an embodiment in which the border of the light exit opening of the firing plate is at least partially angled in the direction of the light unit and inclined against the optical axis at a predetermined angle in an angling.
- deflecting structures are designed in the form of a plurality of prongs for deflecting interfering peripheral rays which are received by the lighting unit. It has proven to be expedient if 20 to 400, in particular 50 to 200 spikes are provided on one side of the border in the longitudinal extension of the light exit opening.
- the invention is particularly useful in a headlamp, in which an intent optical system is arranged in the beam path between the light source and the burning glass sheet.
- the firing glass sheet 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 glass sheet metal is made of metal.
- the burning glass sheet is made of plastic.
- the firing glass sheet has a radiation-absorbing coating to absorb light or heat radiation and not to reflect.
- a pig launcher has a variety of other, not shown here components, such as adjustment and adjustment, 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 may also be included in combination in a superordinate headlight.
- the headlight 1 has a light unit 2, in which a number of LEDs 5 is arranged in a matrix as light source 3 on a printed circuit board 4 .
- the LEDs 5 are preceded by an optical attachment 6 , which is held by a holder 7 here on the circuit board 4.
- the LEDs 5 emit their light into the light-conducting attachment optics 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 an integral lens.
- projection optics 8 which in the present case is an integral lens.
- a combustion glass sheet 9 is arranged, in which a light exit opening 10 is formed.
- Fig. 2 it can be seen that the individual parts are accommodated or held in a housing 11 which is shown only roughly schematically here.
- Fig. 1 and 2 illustrated headlight 1 corresponds to the prior art with regard to the execution of its firing glass sheet 9 and it will be explained below with reference to a principal ray path, the problem of unwanted scattered light occurring here.
- the beam path of the light emitted by the light unit 2 is in Fig. 2 denoted by L e .
- This light or the beam path L e extends from the front side of the attachment optics 6 through the light exit opening 10 of the combustion glass sheet 9 and through the projection optics 8 into the traffic space in front of the motor vehicle.
- Sunlight or sun rays which in this example are incident at an angle of approximately 45 °, are in Fig. 2 denoted by L s .
- the incident sunbeams are focused by the projection optics 8 and, in the absence of the burning glass sheet 9, would impinge concentratedly on a focal spot on the front of the attachment optics where they could cause damage, namely by overheating of components such as the holder 7, often Made of heat-sensitive plastic. Such overheating can not only cause damage, such as warping of adjusted elements, but even local fires and vehicle fires.
- Fig. 2 are the light rays, which would reach without the burning glass sheet 9 to the light unit 2, denoted by L S '.
- the burning glass sheet 9 does not affect those rays L e , which are to produce the light image on the road, but go in practice of the never perfect intent optics 6 also intrinsically undesirable marginal rays L R , which at the substantially horizontally extending inner boundary surface 12th the edge 13 of the light exit opening 10 are deflected in the direction of the projection optics 8 as scattered light L RS and reach into areas of the light image, where they cause unwanted artifacts.
- the invention now proposes, at least in some areas, forming deflection structures on the border of the light exit opening of the combustion glass sheet, which lead to a reduction of the scattered light arising at the border.
- Fig. 3 is in the burning glass sheet 9, the light exit opening 10 and the edge 13 is formed so that the desired light image generating beam path is not trimmed.
- the Fig. 4 it can now be seen that the border 13 is angled at an angle relative to the optical axis a , so that an angled edge region 14 is created.
- This bending of the border 13 does not necessarily have to be made over the entire border, it is usually sufficient in some areas angling, preferably in the lower part of the border. Whether the bend extends in the direction of the lighting unit 2 or in the direction of the projection optical system 8 is substantially irrelevant, as will be explained in greater detail below.
- the Fig. 4 recognizes the principle underlying the invention, which consists in that of the light unit 2 and its attachment optics 6 incident edge beams L R no longer reflected at the now no longer horizontally extending inner boundary surface 12 of the border 13 of the light exit opening 10 in the direction of the projection optics but in the present case to the rear in the direction of the light unit. Unwanted light artifacts in the light image due to the marginal rays L R are thereby avoided.
- the burning glass sheet 9 unlike diaphragms, which define borders of the light image and therefore should be sharply imaged, not in the focal plane of the projection optics 8 but outside, in a meaningful way before this.
- Limitations of the illumination image are determined by the light unit 2 or the attachment optics 6 and not by the light exit opening 10 of the combustion glass sheet 9.
- An example of a diaphragm in the focal plane of the projection optics can be found in the EP 2 742 282 B1 the applicant.
- a light exit opening 10 is formed with a border 13 in the burning glass sheet 9, said border has in its upper and in its lower portion a plurality of prongs 15 for deflecting disturbing, from the light unit 2 ein GmbH edge beams L R.
- a border 13 in the burning glass sheet 9
- prongs 15 for deflecting disturbing, from the light unit 2 ein GmbH edge beams L R.
- Fig. 7 considered speaking of a wavy edge that has serrations 15 and grooves 16 alternately.
- the Fig. 5 to 7 are each two of the light unit 2 ein GmbHde unwanted marginal rays L R drawn and two deflected at the spikes 15 or scattered light beams L A.
- the term “spikes” not necessarily “pointed” surveys but very generally include surveys, typically on a longitudinal side of the light exit opening 20 to 400, usually 50 to 200 such surveys are provided.
- the approximately rectangular light exit opening 10 of the burning glass sheet 9 80 mm wide and 18 mm high and the prongs 15 a height and width between 0.5 up to 2 mm.
- light distribution - Fig. 8 - or for the same headlight without spikes 15 at the border of the light exit opening 10 - Fig. 9 One recognizes scattered light regions above and below the desired light image, of which the upper region is particularly pronounced.
- training with teeth on the border - Fig. 8 - The unwanted scattered light reaches a maximum light intensity of 162 cd, in a training without jags, however, 323 cd.
- Fig. 10a shows again in a detail the Fig. 2 the unwanted 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 combustion glass sheet 9 as a deflecting at least partially has a beveled edge 17 , wherein over the thickness of the firing plate 9 extending bevel in the direction of the optical axis a and the lighting unit is inclined at a predetermined angle. It is in the following Fig. 10c the inclination of this angle opposite to that Fig. 10b , but in both cases, the incoming marginal rays L R are kept away from the projection optics as deflected light beams L A.
- Fig. 10d and Fig. 10e show analogously to Fig. 4 Angled edge regions, wherein the bend 18 in Fig. 10d in the direction of the light unit runs backwards, in Fig. 10e but forward to the projection optics.
- the effect of the deflection structure is comparable in both cases and similar to the bevels of FIGS Fig. 10b and Fig. 10c ,
- FIG. 10f an embodiment in which the border is at least partially tapered in the manner of a cutting edge 19 , whereby also here the effect of a reduction of the scattered light is evident, since there is no area, which Edge rays L R could lead as deflected light rays L A in the direction of the projection optics, but a bevelled edge 17 as in the embodiment according to Fig. 10c is effective.
- a special light unit 2 has been shown and described, namely a lighting unit for a so-called "matrix headlight” with a larger number of LEDs and a front optics with optical fibers, it should be clear that the invention by no means to a certain lighting unit is limited. It is neither a front optics nor a matrix-like arrangement of LEDs for the realization of the invention required, as well as other bulbs instead of LEDs, such as laser diodes with light converters, these can also be used with scanning laser beams, gas discharge lamps and the like.
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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)
Abstract
Ein Kraftfahrzeugscheinwerfer mit einem Brennglasblech (9), welches zwischen einer Leuchteinheit (2) mit zumindest einer Lichtquelle (3) und einer Projektionsoptik (8) angeordnet ist, und welches eine Lichtaustrittsöffnung (10) 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 das Brennglasblech außerhalb der Brennebene der Projektionsoptik liegt, bei welchem an der Umrandung (13) der Lichtaustrittsöffnung (10) des Brennglasblechs (9) zumindest bereichsweise Ablenkstrukturen (14, 15, 16, 17, 18, 19) ausgebildet sind, welche zu einer Ablenkung des von der Leuchteinheit ausgehenden, im Lichtbild unerwünschten Streulichts führen.A motor vehicle headlight with a burning glass sheet (9), which is arranged between a lighting unit (2) with at least one light source (3) and projection optics (8), and which has a light exit opening (10) for light radiated forwards from the lighting unit, wherein the light emanating from the lighting unit is projected by means of the projection optics as a light image into the traffic space and the burning glass sheet lies outside the focal plane of the projection optics, wherein at the border (13) of the light exit opening (10) of the firing glass sheet (9) at least partially deflecting structures (14, 15, 16, 17, 18, 19) are formed, which lead to a deflection of the emanating from the light unit, undesirable in the light image scattered light.
Description
Die Erfindung bezieht sich auf einen Kraftfahrzeugscheinwerfer mit einem Brennglasblech, welches zwischen einer Leuchteinheit mit zumindest einer Lichtquelle und einer Projektionsoptik angeordnet ist, und welches 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 das Brennglasblech außerhalb der Brennebene der Projektionsoptik liegt.The invention relates to a motor vehicle headlight with a burning glass sheet, which is arranged between a lighting unit with at least one light source and a projection optics, and which has a light exit opening for light emitted from the light unit forward, wherein the outgoing light from the light unit by means of the projection optics Photograph is projected into the traffic space and the burning glass sheet is located 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 höher stehenden Sonne unschädlich zu machen.When a motor vehicle with its headlamps is against the sun, the solar radiation in conjunction with optical elements of the headlamp, such as. Lenses, through the so-called burning glass effect, heat parts inside the headlight to such an extent that irreversible damage occurs. For example, plastic parts can smudge or melt or electronic components can be destroyed. Therefore, various measures have been devised to counteract the harmful burning glass effect. In particular, one tries to make the rays of a higher sun harmless by specially designed panels.
Ordnet man ein Brennglasblech vor einer Leuchteinheit, z.B. einem LED-Lichtquellenmodul an, wobei das Brennglasblech 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 "Brennglasblech" in dieser Beschreibung für eine Abdeckung verwendet wird, welche zur Vermeidung des Brennglaseffektes der Sonne verwendet wird, wobei diese Abdeckung nicht notwendigerweise aus metallischem Blech gefertigt sein muss. Die Abdeckung kann vielmehr auch aus Kunststoffen bestehen und das Brennglasblech kann, sei es aus Metall oder aus Kunststoff gefertigt, eine strahlungsabsorbierende Beschichtung aufweisen, sodass Licht bzw. Wärmestrahlung an dem Blech absorbiert werden.If a burning glass sheet is placed in front of a lighting unit, e.g. an LED light source module, wherein the burning glass sheet has a light exit opening for the light emitted from the light unit forward, occurs as a disturbing side effect at the edges of the most punched out of a sheet of light exit light scattered light, which affects the projected onto the street photograph undesirable. It should be noted that the term "burning glass sheet" in this specification is used for a cover which is used for avoiding the burning effect of the sun, which cover need not necessarily be made of metallic sheet. Rather, the cover can also be made of plastics and the firing glass sheet can, whether made of metal or plastic, have a radiation-absorbing coating, so that light or heat radiation are absorbed on the sheet.
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 photographic image.
Diese Aufgabe wird mit einem Kraftfahrzeugscheinwerfer der eingangs genannten Art gelöst, bei welchem erfindungsgemäß an der Umrandung der Lichtaustrittsöffnung des Brennglasblechs 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 headlamp of the type mentioned, in which according to the invention at the border of the light exit opening of the firing plate at least partially deflection structures are formed, which lead to deflection of the emanating from the light unit, undesirable in the light scattered light.
Dank der Erfindung wird von der Leuchteinheit bzw. Lichtquelle des Scheinwerfers ausgehendes Licht an der Umrandung der Lichtaustrittsöffnung des Brennglasbleches 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, outgoing light from the light unit or light source of the headlight is no longer reflected at the border of the light exit opening of the combustion glass sheet in the direction of the projection optics, whereby unwanted scattered light can be significantly reduced in the projected onto the street photo.
Bei einer herstellungstechnisch einfachen Ausführung kann vorgesehen sein, dass die Umrandung der Lichtaustrittsöffnung des Brennglasbleches als Ablenkstruktur zumindest bereichsweise eine abgeschrägte Kante aufweist, wobei die über die Dicke des Brennglasblechs verlaufende Abschrägung in Richtung der optischen Achse und der Leuchteinheit unter einem vorgegebenen Winkel geneigt ist.In a manufacturing technology simple design can be provided that the border of the light exit opening of the Brennglasbleches as deflecting at least partially has a beveled edge, wherein over the thickness of the firing plate extending bevel in the direction of the optical axis and the lighting unit is inclined at a predetermined angle.
Besonders preisgünstig und leicht herzustellen ist eine Ausführung, bei welcher die Umrandung der Lichtaustrittsöffnung des Brennglasblechs 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 manufacture is an embodiment in which the border of the light exit opening of the firing plate is at least partially angled in the direction of the light unit and inclined against the optical axis at a predetermined angle in an angling.
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 deflecting structures are designed in the form of a plurality of prongs for deflecting interfering peripheral rays which are received by the lighting unit. It has proven to be expedient if 20 to 400, in particular 50 to 200 spikes 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 dem Brennglasblech eine Vorsatzoptik im Strahlengang angeordnet ist.The invention is particularly useful in a headlamp, in which an intent optical system is arranged in the beam path between the light source and the burning glass sheet.
Aus optischer und abbildungstechnisch vorteilhafter Sicht ist es günstig, wenn das Brennglasblech vor der Brennebene der Projektionslinse angeordnet ist.From an optical and illustratively advantageous point of view, it is favorable if the firing glass sheet 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 das Brennglasblech aus Metall. Andererseits kann es in anderen Fällen von Vorteil sei, wenn das Brennglasblech aus Kunststoff besteht.In a practice-proven training, the glass sheet metal is made of metal. On the other hand, it may be advantageous in other cases, if the burning glass sheet is made of plastic.
In beiden Fällen ist es oft empfehlenswert, wenn das Brennglasblech eine strahlungsabsorbierende Beschichtung aufweist, um Licht- bzw. Wärmestrahlung zu absorbieren und nicht zu reflektieren.In both cases, it is often recommended that the firing glass sheet has a radiation-absorbing coating to absorb light or heat radiation and not to reflect.
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 vorgesetztem Brennglasblech 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 eines Brennglasblechs 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 eines Brennglasblechs 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 einem Brennglasblech nach der zweiten Ausführungsform der Erfindung gemäßFig. 5 bis 7 , -
Fig. 9 eine beispielsweise Lichtverteilung eines Scheinwerfers mit einem Brennglasblech nach dem Stand der Technik und -
Fig. 10a bis 10f Schnitte analog zuFig. 4 durch unterschiedlich ausgebildete Brennglasbleche, wobeiFig. 10a den Stand der Technik undFig. 10b bis 10f Ausführungsformen gemäß der Erfindung zeigen.
-
Fig. 1 schematic and diagrammatic representation of components of a headlamp, namely a light unit with superior firing glass sheet and a projection lens, -
Fig. 2 a schematic section through a headlamp of the subject type with the inFig. 1 shown components, wherein some essential beam paths are shown, -
Fig. 3 a view of a combustion glass sheet of a first embodiment of the invention from the front, -
Fig. 4 a section along the line IV-IV ofFig. 3 showing a deflection structure of the first embodiment, -
Fig. 5 a view of a combustion glass sheet of a second embodiment of the invention from the front, -
Fig. 6 a section along the line VI-VI ofFig. 5 showing a deflection structure of the second embodiment, -
Fig. 7 an enlarged detail of the deflection structure ofFig. 6 . -
Fig. 8 an example, light distribution of a headlamp with a firing glass according to the second embodiment of the invention according toFig. 5 to 7 . -
Fig. 9 for example, a light distribution of a headlamp with a prior art glass sheet and -
10a to 10f Cuts analogous toFig. 4 by differently formed Brennglasbleche, whereinFig. 10a the state of the art andFig. 10b to 10f Embodiments according to the invention show.
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, like reference numerals are used for the same or similar elements for ease of 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 numerals used in the claims are only intended to facilitate the readability of the claims and the understanding of the invention and in no way have a character which adversely affects the 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 refer to the illustration in the drawing but necessarily to a use or installation position.
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 ein Brennglasblech 9 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 das Brennglasblech auftreffen, das seinem Zweck entsprechend hitzefest sowie absorbierend und/oder reflektierend ausgebildet sein kann. In
Das Brennglasblech 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 burning
Um diesem Problem zu begegnen, sieht die Erfindung nun vor, zumindest bereichsweise Ablenkstrukturen an der Umrandung der Lichtaustrittsöffnung des Brennglasblechs auszubilden, welche zu einer Verminderung des an der Umrandung entstehenden Streulichts führen.In order to counteract this problem, the invention now proposes, at least in some areas, forming deflection structures on the border of the light exit opening of the combustion glass sheet, which lead to a reduction of the scattered light arising 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 des Brennglasblechs, von dessen Dicke und von der Position des Brennglasblechs 9 in Bezug zur Austrittsfläche der Vorsatzoptik.As far as the extent of the bend is concerned, its angle must be large enough so that incident edge beams L R are not directed forward to the
Es soll darauf hingewiesen werden, dass das Brennglasblech 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 des Brennglasblechs 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 des Brennglasblechs 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
Schließlich zeigt
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)
dadurch gekennzeichnet, dass
an der Umrandung (13) der Lichtaustrittsöffnung (10) des Brennglasblechs (9) zumindest bereichsweise Ablenkstrukturen (14, 15, 16, 17, 18, 19) ausgebildet sind, welche zu einer Ablenkung des von der Leuchteinheit ausgehenden, im Lichtbild unerwünschten Streulichts führen.Motor vehicle headlight with a burning glass sheet (9) which is arranged between a light unit (2) with at least one light source (3) and projection optics (8), and which has a light exit opening (10) for light radiated forwards from the light unit, wherein the projected by the light unit outgoing light is projected by means of the projection optics as a light image in the traffic space and the burning glass sheet is located outside the focal plane of the projection optics,
characterized in that
at the boundary (13) of the light exit opening (10) of the combustion glass sheet (9) at least partially deflection structures (14, 15, 16, 17, 18, 19) are formed, which lead to a deflection of the emanating from the light unit, unwanted scattered light in the light image ,
Priority Applications (7)
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 |
JP2020541891A JP7019824B2 (en) | 2018-02-15 | 2019-01-22 | Automatic vehicle floodlight equipped with a light-shielding diaphragm that blocks incident sunlight |
KR1020207023532A KR102429313B1 (en) | 2018-02-15 | 2019-01-22 | Automotive headlamps with shielding screens to shield incident solar radiation |
US16/969,789 US11371671B2 (en) | 2018-02-15 | 2019-01-22 | Motor vehicle headlamp having a shielding screen for shielding incident solar radiation |
CN201980013501.4A CN111699344B (en) | 2018-02-15 | 2019-01-22 | Motor vehicle headlight with a shading screen for shading incoming solar radiation |
EP19705093.3A EP3752765B1 (en) | 2018-02-15 | 2019-01-22 | Motor vehicle headlamp with a shielding screen against incoming solar radiation |
PCT/EP2019/051435 WO2019158319A1 (en) | 2018-02-15 | 2019-01-22 | Motor vehicle headlamp having a shielding screen for shielding incident solar radiation |
Applications Claiming Priority (1)
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 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3527875A1 true EP3527875A1 (en) | 2019-08-21 |
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 After (1)
Application Number | Title | Priority Date | Filing Date |
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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 |
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) |
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FR3105351A1 (en) * | 2019-12-18 | 2021-06-25 | Valeo Vision | Motor vehicle light module. |
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DE102020101038A1 (en) | 2020-01-17 | 2021-07-22 | OSRAM Opto Semiconductors Gesellschaft mit beschränkter Haftung | Light-emitting component |
JP2022060094A (en) * | 2020-10-02 | 2022-04-14 | 株式会社小糸製作所 | Lighting fixture unit |
JP7113999B1 (en) * | 2021-06-30 | 2022-08-05 | 京セラ株式会社 | lighting equipment |
WO2023276256A1 (en) * | 2021-06-30 | 2023-01-05 | 京セラ株式会社 | Lighting device |
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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Also Published As
Publication number | Publication date |
---|---|
EP3752765B1 (en) | 2022-10-26 |
KR102429313B1 (en) | 2022-08-04 |
EP3752765A1 (en) | 2020-12-23 |
CN111699344A (en) | 2020-09-22 |
CN111699344B (en) | 2022-09-30 |
JP7019824B2 (en) | 2022-02-15 |
WO2019158319A1 (en) | 2019-08-22 |
KR20200110680A (en) | 2020-09-24 |
US11371671B2 (en) | 2022-06-28 |
JP2021512466A (en) | 2021-05-13 |
US20210003263A1 (en) | 2021-01-07 |
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