EP3502554A1 - Projection device for a motor vehicle headlight and method for the preparation of a projection device - Google Patents

Abstract

The invention relates to a projection device (1) for a motor vehicle headlight, the projection device (1) being designed to image light from at least one light source (2) associated with the projection device (1) in an area in front of a motor vehicle in the form of at least one light distribution, one opaque coating consists of partial layers arranged at least flat one above the other, namely a reflective metallic first partial layer (6 ') and a second partial layer (6 ") consisting essentially of black light-absorbing lacquer, the first partial layer (6') between the entrance optics (3) and the second sub-layer (6 ") is arranged.

Description

The invention relates to a projection device for a motor vehicle headlight, wherein the projection device is adapted for imaging light of at least one projection device associated light source in an area in front of a motor vehicle in the form of at least one light distribution, wherein the projection device has an entrance optics, which are preferably arranged in an array having an exit optics, which are preferably arranged in an array, wherein each micro-entry optics is associated with exactly one micro-exit optics, wherein the micro-entry optics formed in such and / or the micro-entry optics and the micro-exit optics are arranged to each other, that substantially all of the light emerging from a micro-entrance optics enters only into the associated micro-exit optics, and wherein the light preformed by the micro-entrance optics of the micro-exit optics in a region before the Motor vehicle is shown as at least one light distribution, wherein between the entrance optics and the exit optics at least one translucent carrier is arranged, wherein the at least one carrier at least a first diaphragm device, wherein the first diaphragm device is arranged such that substantially all entering the entrance optics Light is directed to the first diaphragm device, wherein the first diaphragm device has an optically active surface, wherein in the optically active surface for forming a predetermined light distribution transparent windows are formed, which are delimited by a substantially opaque coating.

The invention further relates to a microprojection light module for a motor vehicle headlight, comprising at least one projection device according to the invention, a vehicle headlight, in particular a motor vehicle headlight comprising at least one microprojection light module according to the invention and a vehicle, in particular a motor vehicle, with at least one vehicle headlight according to the invention.

Furthermore, the invention relates to a method for producing a projection device according to the invention for a motor vehicle headlight.

Furthermore, the invention relates to a method for producing a projection device according to the invention for a motor vehicle headlight.

For example, the document is from the prior art AT 514967 B1 become known, which shows a projection device. Due to the increasing miniaturization of the entrance and exit optics, the optics are becoming increasingly sensitive to tolerances. So far, attempts have been made to reduce dimensional inaccuracies with the aid of improved production methods.

It has surprisingly been found that now the heat input into the projection device has a significant influence on their optical behavior. By heat input of a light source as well as by light absorption within the respective optics or diaphragm device they can be heated so far that the projection device causes aberrations. In this case, optics and optionally provided diaphragm devices may have different thermal expansion coefficients due to material differences and expand differently. This problem is even more pronounced when transparent elements such as the entrance optics and the exit optics as well as absorbing elements such as optionally provided aperture devices reach different temperature levels when heat is applied.

It is therefore an object of the invention to provide a projection device in which aberrations can be largely avoided despite increasing miniaturization. This object is achieved with a projection device of the type mentioned, in which according to the invention the opaque coating consists of at least two superimposed sublayers, namely a reflective metallic first sub-layer and a substantially consisting of black light-absorbing paint second sub-layer, wherein the first sub-layer between the Entry optics and the second sub-layer is arranged.

By providing an opaque coating according to the invention, which has a first metallic sub-layer and is covered by a second black light-absorbing sub-layer, it is made possible that the heat input into the aperture device is greatly reduced by not directing light to the aperture device via the entry optics as usual is absorbed to large proportions in the diaphragm device, but is reflected back by the metallic first sub-layer again. Since the first part-layer is the first layer which is exposed to the full luminous flux which is coupled in through the entrance optics, the reflective properties of the first part-layer are of particular advantage and thus reduce the heat input into the at least one support and any optics attached thereto ( eg the entrance and / or exit optics), which causes counteracted due to thermal expansion aberrations.

The actual heat input into the diaphragm device depends in practice on the luminous flux as well as the light distribution to be formed. For example, in the case of a low-beam light distribution, approximately 40% of the light irradiated through the entrance optics is shadowed by means of the diaphragm device. Reflection on the first part layer thus significantly reduces the heat input into the diaphragm device. This reflected light also causes no disturbing stray light.

In addition, the provision of a downstream black second sub-layer achieves a further effect which leads to the reduction of aberrations. The provision of a metallic first partial layer without a follow-up layer would have the consequence that stray light fed back into the diaphragm device is again reflected forward over the reflective layer. This would result in unwanted crosstalk in a downstream optics. By means of the light-absorbing second sub-layer of this feedback scattered light can be absorbed and thus crosstalk can be avoided. Since the scattered light represents only a small proportion of the total luminous flux, the heat input thereby introduced into the diaphragm device is negligible. The metallized layer also increases the opacity of the diaphragm device.

It should be mentioned at this point that it is quite possible to provide further diaphragm devices which may be located downstream of said at least one diaphragm device. For example, a second beam stop can be provided, which can be provided to eliminate optical errors. By the expression "that essentially all the light entering the entrance optics is directed to the first diaphragm device" is understood an arrangement in which it is sought to avoid scattered light and, if possible, the entire luminous flux coupled into the entrance optics to the first diaphragm device to steer. By the term "a substantially opaque coating" is meant a coating applied thereto Coating incident light is reduced at least to an extent so that no passage of light is visible to the human eye.

The phrase "essentially all the light emerging" means that it is sought to actually radiate all the light flux exiting a micro-entry optic only into the associated micro-exit optic. If this is not possible due to the circumstances, then seek to irradiate at least as little luminous flux in the adjacent micro-exit optics that thereby no adverse optical effects, such as stray light, which can lead to glare, etc., result.

Moreover, in the wording "with the micro-entrance optics being designed in such a way and / or the micro-entry optics and the micro-exit optics being arranged relative to one another" it is to be understood that additional measures, such as apertures (see below), may be provided either exclusively or preferably in addition to their actual function, they still have the function that the entire luminous flux is directed precisely to the associated micro-exit optics.

By using a number or a plurality of associated micro-optics instead of a single optic as in conventional projection systems, both the focal lengths and the dimensions of the micro-optics per se are significantly lower than in a "conventional" optics. Likewise, the center thickness can be reduced compared to a conventional optics. As a result, the overall depth of the projection device compared to a conventional optics can be significantly reduced.

By increasing the number of micro-optics systems, on the one hand, the luminous flux can be increased or scaled, wherein an upper limit with regard to the number of micro-optics systems is limited primarily by the respectively available production methods. For the generation of a low-beam function, for example, 200 to 400 micro-optical systems may be sufficient or favorable, but this is not intended to describe a limiting value up or down but merely an exemplary number. To increase the luminous flux, it is beneficial to increase the number of similar micro-optics. Conversely, one can use the variety of micro-optics to introduce micro-optics of different optical behavior into a projection system to generate or superimpose different light distributions. The variety of micro-optics thus also allows design options that are not available in a conventional optics. Individual micro-optics can have different focal lengths, whereby additional degrees of freedom in the design of the light distribution can be obtained. Some micro-optics can be designed as astigmatic lenses, so that the incident luminous flux is influenced differently, for example, in the horizontal and vertical directions. Thus, individual micro-optics, for example, can contribute to changing the maximum value of the irradiance in a light distribution, other micro-optics can in turn be used to control the horizontal extent of the light distribution.

Such a projection device or light module is also scalable, that is, multiple identical or similarly constructed light modules can be made into a larger overall system, e.g. be assembled to a vehicle headlight.

In a conventional projection system with a projection lens, the lens has typical diameters between 60 mm and 90 mm. In a module according to the invention, the individual micro-optics systems have typical dimensions of approximately 2 mm × 2 mm (in V and H) and a depth (in Z, see, for example, FIG FIG. 1 ) of about 6mm - 10 mm, so that there is a much smaller depth of a module according to the invention compared to conventional modules.

The projection device according to the invention has a small overall depth and are basically freely formable, i. it is e.g. it is possible to design a first light module for generating a first partial light distribution separately from a second light module for a second partial light distribution and to make it relatively free, i. arranged vertically and / or horizontally and / or offset in depth to each other, so that design specifications can be realized easier.

Another advantage of a projection module according to the invention is that the exact positioning of the light source (s) with respect to the projection device is eliminated. Exact positioning is only of secondary importance insofar as the at least one light source may possibly illuminate an entire array of micro-entrance optics, all of which produce substantially the same light image. In other words, this means nothing else than that the "actual" light source is formed by the real light source (s) and the array of micro-entry optics. This "actual" light source then illuminates the micro-exit optics and optionally the associated apertures. Now, however, since the micro-entry and micro-exit optics are already optimally matched to one another, since they form a quasi-system, an inaccurate positioning of the real light source (s) is less significant. The real light sources are, for example, approximately punctiform light sources such as light-emitting diodes whose light is collimated by collimators such as Compound Parabolic Concentrators (CPC) or TIR (Total Internal Reflection) lenses. By the parallel alignment of the light emitted by the light source, the relative position between the light source and the projection device can be freely selected.

• *) Abbiegelicht-Lichtverteilung;
• *) Stadtlicht-Lichtverteilung;
• *) Landstraßenlicht-Lichtverteilung;
• *) Autobahnlicht-Lichtverteilung;
• *) Lichtverteilung für Zusatzlicht für Autobahnlicht;
• *) Kurvenlicht-Lichtverteilung;
• *) Abblendlicht-Vorfeld-Lichtverteilung;
• *) Lichtverteilung für asymmetrisches Abblendlicht im Fernfeld;
• *) Lichtverteilung für asymmetrisches Abblendlicht im Fernfeld im Kurvenlichtmodus;
• *) Fernlicht-Lichtverteilung;
• *) Blendfreies Fernlicht-Lichtverteilung.

The projection device according to the invention can be set up to produce a wide variety of light distributions. By way of example, the following light distributions are mentioned at this point:

• *) Cornering light distribution;
• *) City light distribution;
• *) Highway light distribution;
• *) Motorway light distribution;
• *) Light distribution for additional light for motorway light;
• *) Cornering light distribution;
• *) Low beam apron light distribution;
• *) Light distribution for asymmetrical low beam in the far field;
• *) Light distribution for asymmetric low beam in the far field in the bend lighting mode;
• *) High beam light distribution;
• *) Glare-free high beam light distribution.

Examples of the appearance of such light distributions include the document AT 514967 B1 removable.

In particular, it can be provided that the second sub-layer consists of black photoresist. This allows the clearance of the translucent areas to be created accurately and efficiently. Photoresist is understood to be a photolithographic structuring lacquer, i. when exposed, the solubility of the photo-layer is e.g. locally altered by ultraviolet illumination under an exposure mask or photo template. Such a varnish may also be referred to as a photoresist and is e.g. in the form of the product "Daxin ABK408X" commercially available.

Advantageously, it may be provided that the metallic layer of aluminum, chromium, and / or the black chrome alternatively also consists of magnesium, titanium, tantalum, molybdenum, iron, copper, nickel, palladium, silver, zinc, antimony, tin, arsenic or bismuth. Also, the metallic layer could be formed by semimetals / semiconductors such as silicon, gallium or indium.

In order to reduce the influence of the thermal expansion on the carrier, it may be provided to provide a material with the lowest possible thermal expansion coefficient. For this purpose, the at least one carrier at least partially or even completely made of glass.

In particular, it can be provided that classic antireflection coatings (AR coatings) are applied to the glass boundary layers, which have a positive effect on the reflection behavior of the layer structure. Specifically, by a refractive index matching between the glass substrate and the metallic sub-layer, the heat input can be further reduced by increasing the reflectance.

It can also be provided that the inlet and outlet optics are firmly connected to the at least one carrier. This positional errors of the entrance and exit optics can be avoided each other.

Alternatively, it may be provided that two or more carriers are arranged between the entrance and the exit optics, wherein the entrance optics and the exit optics are each fixedly connected to a carrier. Also, the carriers can be firmly interconnected.

Furthermore, it can be provided that the opaque coating has a transmittance T less than 0.001, preferred T less than 0.0002.

In addition, it can be provided that the reflective metallic first sub-layer has a reflection coefficient of at least 0.55, preferably> 0.85, for light in a wavelength range between 400 nm and 700 nm (ie visible light).

Furthermore, the invention relates to a microprojection light module for a motor vehicle headlight, comprising at least one projection device according to the invention and at least one light source for feeding light into the projection device.

Advantageously, it can be provided that the light source comprises at least one LED, preferably a number of LEDs, each light source having a light collimating parallel aligning optics, which is designed and arranged for parallel irradiation in the entrance optics.

Furthermore, the invention relates to a vehicle headlight, in particular a motor vehicle headlight, comprising at least one microprojection light module.

1. I) Heranziehen und Bearbeiten eines lichtdurchlässigen Trägers zur Ausbildung zumindest einer ersten Blendenvorrichtung mit einer optisch wirksamen Fläche, gemäß den folgenden Teilschritten
   1. a) Beschichten einer Seite des lichtdurchlässigen Trägers mit einer reflektierenden metallischen ersten Teilschicht,
   2. b) vollflächiges Bedecken der ersten Teilschicht mit einer aus schwarzem lichtabsorbierendem Fotolack bestehenden zweiten Teilschicht,
   3. c) Belichten und Entwickeln der zweiten Teilschicht zur Ausbildung von lichtdurchlässigen Fenstern innerhalb der zweiten Teilschicht, durch die korrespondierende Bereiche der ersten Teilschicht freigelegt werden,
   4. d) Ausbildung von zu Schritt c) korrespondierenden deckungsgleichen lichtdurchlässigen Fenstern in der ersten Teilschicht durch Entfernen der entsprechenden Bereiche der reflektierenden metallischen ersten Teilschicht mittels eines Ätz- oder Löseverfahrens,
2. II) Positionieren des gemäß Schritt I) erhaltenen Trägers zwischen einer Eintrittsoptik und einer Austrittsoptik, wobei die Eintrittsoptik eine Anzahl von Mikro-Eintrittsoptiken aufweist, welche vorzugsweise in einem Array angeordnet sind, und wobei die Austrittsoptik eine Anzahl von Mikro-Austrittsoptiken aufweist, welche vorzugsweise in einem Array angeordnet sind, wobei die erste Blendenvorrichtung dergestalt angeordnet ist, dass im Wesentlichen das gesamte in die Eintrittsoptik eintretende Licht auf die Blendenvorrichtung gelenkt ist, wobei in der optisch wirksamen Fläche zur Formung einer vorgebbaren Lichtverteilung lichtdurchlässige Fenster gemäß Teilschritt I-d) ausgebildet sind, die durch eine durch Überlagerung der ersten und zweiten Teilschicht erhaltenen im Wesentlichen lichtundurchlässige Beschichtung begrenzt sind, wobei die erste Teilschicht zwischen der Eintrittsoptik und der zweiten Teilschicht angeordnet ist.

Moreover, the invention relates to a method for producing a projection device according to the invention, comprising the following steps:

1. I) drawing and processing a translucent support for forming at least a first diaphragm device with an optically effective surface, according to the following sub-steps
   1. a) coating one side of the translucent carrier with a reflective metallic first partial layer,
   2. b) covering the first partial layer over the entire surface with a second partial layer consisting of black light-absorbing photoresist,
   3. c) exposing and developing the second sub-layer to form translucent windows within the second sub-layer, through which corresponding areas of the first sub-layer are exposed,
   4. d) formation of congruent translucent windows corresponding to step c) in the first sub-layer by removing the corresponding regions of the reflective metallic first sub-layer by means of an etching or dissolving method,
2. II) positioning the carrier obtained according to step I) between an entrance optics and an exit optics, wherein the entry optics comprises a number of micro entrance optics, which are preferably arranged in an array, and wherein the exit optics comprises a number of micro exit optics, which preferably are arranged in an array, wherein the first diaphragm device is arranged in such a way that substantially all of the light entering the entrance optics is directed onto the diaphragm device, wherein translucent windows according to partial step Id) are formed in the optically effective surface for forming a predefinable light distribution, which are delimited by a substantially opaque coating obtained by superposition of the first and second sub-layers, wherein the first sub-layer is arranged between the entrance optics and the second sub-layer.

In addition, as has already been mentioned in connection with the projection device according to the invention, it may be provided that exactly one micro exit optic is assigned to each micro entrance optic, the micro entrance optics being designed in such a way and / or the micro entrance optics and the micro exit optics are disposed relative to each other such that substantially all of the light emerging from a micro-entrance optics enters only the associated micro-exit optics, and wherein the light preformed by the micro-entry optics of the micro-exit optics in an area in front of the motor vehicle as at least one Light distribution is displayed.

Advantageously, it can be provided that the full-surface covering of the first part-layer according to step is applied by means of spin-coating or spray-coating with a second partial layer consisting of black light-absorbing photoresist according to partial step I-b).

In particular, it can be provided that the layer thickness of the second partial layer is between 0.5 and 4 micrometers, preferably 1.5 micrometers. The layer thickness of the first partial layer is between 100 and 400 nanometers, preferably 200 nm.

In other words, LEDs can be used as the light source in the invention, wherein the radiated light cone of the LED can be directed substantially parallel by means of collimator optics. This parallel light can be used as illumination for the microlens array. In a microlens stack, by means of a primary lens array, the parallel light can first be focused onto a primary beam stop (namely, the first stop device), in this stop the focused light is trimmed into the desired distribution (e.g., low beam). Thereafter, a secondary beam stop can follow, which can correct optical errors (unwanted crosstalk of light into subsequent microprojection systems) in the system. At the end is the secondary lens array (the exit optics), which depicts the desired light distribution on the street.

• Auflösungsgenauigkeit <4µm
• Temperaturbeständigkeit -40°C bis 180°C über Fahrzeuglebensdauer
• Transmissionsgrad bevorzugt kleiner 0,0002
• Nach vorne (in Fahrtrichtung) möglichst lichtabsorbierend.

The following requirements can be met by the first aperture device:

• Resolution accuracy <4μm
• Temperature resistance -40 ° C to 180 ° C over vehicle life
• Transmittance preferably less than 0.0002
• To the front (in the direction of travel) as light as possible.

• Schritt 1: Ein Glassubstrat wird einseitig komplett metallisiert. Beispielsweise kann Aluminium aufgesputtert (Schichtdicke im Bereich 200nm) werden. Alternativ dazu könnte ebenso beispielsweise Chrom, Schwarzchrom, etc. verwendet werden.
• Schritt 2: Ein schwarzes Negativ-Fotoresist mittels Spincoating oder Sprühbelackung kann vollflächig über der metallisierten Schicht aufgetragen werden (Schichtdicke zwischen 1,5 und 2µm). Danach kann der Fotolack durch eine Maske belichtet werden. Mittels Entwicklerflüssigkeit kann die strukturierte Blendengeometrie in der gewünschten Auflösungsgenauigkeit (< 4µm) entwickelt werden. Es ist aber auch die Verwendung von Positiv-Fotoresist möglich.
• Schritt 3: Die Metallisierung kann mittels eines nasschemischen Prozesses frei geätzt werden. Der strukturierte schwarze Fotolack dient in diesem Schritt als Ätzmaske. Das Ergebnis ist eine strukturierte Strahlenblende, welche eine reflektierende und eine schwarze Schicht auf einer Seite aufweist.

Such a diaphragm device can be obtained by the following steps:

• Step 1: A glass substrate is completely metallized on one side. For example, aluminum can be sputtered on (layer thickness in the range 200 nm). Alternatively, for example, chromium, black chrome, etc. could also be used.
• Step 2: A black negative photoresist by means of spin coating or spray coating can be applied over the whole surface of the metallized layer (layer thickness between 1.5 and 2 μm). After that, the photoresist can be exposed through a mask. By means of developer liquid, the structured aperture geometry can be developed in the desired resolution accuracy (<4 μm). But it is also the use of positive photoresist possible.
• Step 3: The metallization can be freely etched by a wet chemical process. The structured black photoresist serves as an etching mask in this step. The result is a structured beam stop that has a reflective and a black layer on one side.

• Figur 1 eine perspektivische Darstellung eines Mikroprojektions-Lichtmoduls bzw. einer darin enthaltenen Projektionseinrichtung, die für den Einsatz der Erfindung vorbereitet ist,
• Figur 2 eine schematische Schnittdarstellung einer erfindungsgemäßen Projektionseinrichtung,
• Figur 3 eine Detaildarstellung eines in Figur 2 dargestellten Trägers,
• Figuren 4a bis 4m beispielhafte Schritte zur Fertigung einer erfindungsgemäßen Projektionseinrichtung.

The invention is explained in more detail below with reference to an exemplary and non-limiting embodiment, which is illustrated in the figures. It shows

• FIG. 1 a perspective view of a microprojection light module or a projection device contained therein, which is prepared for the use of the invention,
• FIG. 2 a schematic sectional view of a projection device according to the invention,
• FIG. 3 a detailed representation of an in FIG. 2 illustrated carrier,
• FIGS. 4a to 4m exemplary steps for manufacturing a projection device according to the invention.

In the following figures, unless otherwise stated, like reference numerals designate like features.

FIG. 1 shows a perspective view of a microprojection light module 10 and a projection device contained therein, as used for the invention may be, wherein the light module 10, a light source 2, a light collimating optics 7, an entrance optics 3, which has a number of micro-entrance optics 3a, which are preferably arranged in an array, a carrier 5 and an exit optics 4. The exit optics 4 has a number of micro exit optics 4a, which are preferably arranged in an array.

The projection device 1 is suitable for installation in a motor vehicle headlight, wherein in the installed state, the axis x denotes the vehicle longitudinal axis or the direction of travel, the axis y normal to the axis x oriented horizontal axis and the axis z denotes a vertical axis which is normal to is oriented by the axes x and y spanned horizontal plane.

FIG. 2 shows a schematic sectional view of a projection device according to the invention 1 or a microprojection light module 10 for a motor vehicle headlamp, comprising at least one projection device 1 and at least one light source 2 for feeding light into the projection device 1. It can be seen that each micro-entrance optics 3a exactly one Micro exit optics 4a is assigned. The micro-entry optics 3a are designed in such a way and / or the micro-entry optics 3a and the micro-exit optics 4a are arranged relative to one another such that substantially all of the light emerging from a micro entrance optics 3a enters only into the associated micro exit optics 4a. The light preformed by the micro-entrance optics 3a is imaged by the micro-exit optics 4a in an area in front of the motor vehicle as at least one light distribution.

At least one light-transmissive carrier 5 is arranged between the entrance optics 3 and the exit optics 4, the at least one carrier 5 having at least one first diaphragm device 6, the first diaphragm device 6 being arranged in such a way that substantially all of the light entering the entrance optics 3 is present the diaphragm device 6 is guided, wherein the diaphragm device 6 has an optically effective surface 6a, wherein in the optically effective surface 6a for forming a predefinable light distribution translucent window 6b (see, eg Figures 3 and 4b and 4c) which are delimited by a substantially opaque coating.

Based on FIGS. 2 and 3 It can be seen that the opaque coating consists of sub-layers 6 'and 6 "arranged at least over one another, namely a reflective metallic first sub-layer 6' and a second sub-layer 6" consisting essentially of black light-absorbing lacquer, the first sub-layer 6 'being between the In the present case, this arrangement is produced by arranging both layers on the light exit side of the first carrier 5 and by applying the first partial layer 6 'and subsequently the second partial layer 6 ". It can be seen on the basis of exemplary light beams L1 that light is directed via the entrance optics 3 onto the optically active surface 6a and can pass through the translucent windows 6b. Those light beams L2 which pass through windows 6b strike corresponding micro exit optics 4a of the exit optics 4, these light beams LV mostly leaving the micro exit optics 4a to the outside. However, a small (undesired) portion is reflected by the exit optics 4 back toward the second sub-layer 6 ", which is designed to absorb these light beams and thus avoid them being reflected uncontrollably in the direction of the exit optics 4. One by reflection Crosstalk of light beams LS caused at the exit optics 4 can thus be effectively counteracted.

FIGS. 4a to 4m show exemplary steps for manufacturing a projection device 1 according to the invention. FIG. 4a ) shows a translucent support 5, which is used to form a first diaphragm device 6 and processed as follows: According to FIG. 4a one side of the carrier 5 is coated with a reflective metallic first partial layer 6 '. Subsequently, the first partial layer 6 'is covered over the entire surface with a second partial layer 6 "consisting of black light-absorbing photoresist (FIG. FIG. 4b ). The next step is to expose and develop the second sub-layer 6 "to form translucent windows within the second sub-layer (FIG. Figure 4c Thereafter, translucent windows 6b in the first sub-layer are formed by removing the respective regions of the reflective metallic first sub-layer 6 'by means of an etching process (see FIG FIG. 4d ). The outline contours of the translucent windows 6b can be configured as desired; the embodiment shown by way of example corresponds to a low-beam distribution with an increase in asymmetry. Subsequently, the entrance optics 3 can be attached to the carrier 5 ( Figure 4e ), where the first sub-layer 6 'is arranged between the entrance optics 3 and the second sub-layer 6 "In the present exemplary embodiment, a second support 8 is provided on which a further diaphragm 9 for reducing optical aberrations is provided. namely, the diaphragm support 8 and a cover element 8 '. On the cover element 8', the exit optics 4 can be attached (see FIG Figures 4f to 4k ). Finally, the carriers 5 and 8 are connected to each other so that the input and output optics 3 and 4 face each other and the diaphragms 6 and 9 are arranged therebetween.

In view of this teaching, one skilled in the art will be able to arrive at other, not shown embodiments of the invention without inventive step. The invention is therefore not limited to the embodiment shown. Also, individual aspects of the invention or the embodiment can be taken up and combined with each other. Essential are the ideas underlying the invention, which can be performed by a person skilled in the knowledge of this description in a variety of ways and still remain maintained as such. Any reference numbers in the claims are exemplary and are only for ease of reading the claims without limiting.

Claims (15)

Projection device (1) for a motor vehicle headlight, wherein the projection device (1) for imaging light of at least one of the projection device (1) associated light source (2) is arranged in an area in front of a motor vehicle in the form of at least one light distribution, wherein the projection device (1) - An entrance optics (3) having a number of micro-entry optics (3a), which are preferably arranged in an array, - An exit optics (4) having a number of micro-exit optics (4a), which are preferably arranged in an array, wherein each micro-entry optics (3a) is associated with exactly one micro-exit optics (4a),
wherein the micro-entry optics (3a) are formed in such a way and / or the micro-entry optics (3a) and the micro-exit optics (4a) are arranged to one another such that substantially all of the light emerging from a micro-entry optics (3a) only in the associated micro-exit optics (4a) occurs, and wherein
the light preformed by the micro-entry optics (3a) is imaged by the micro-exit optics (4a) in an area in front of the motor vehicle as at least one light distribution,
wherein between the entrance optics (3) and the exit optics (4) at least one translucent support (5) is arranged, wherein the at least one support (5) at least a first diaphragm device (6), wherein the first diaphragm device (6) is arranged in such a way in that substantially all of the light entering the entrance optics (3) is directed onto the first diaphragm device (6), the first diaphragm device (6) having an optically effective surface (6a), wherein in the optically effective surface (6a) Forming a predetermined light distribution translucent windows (6b) are formed, which are limited by a substantially opaque coating,
characterized in that
the opaque coating consists of at least surface layers arranged one above the other, namely a reflective metallic first partial layer (6 ') and a second partial layer (6 ") consisting essentially of black light-absorbing lacquer, the first partial layer (6') being arranged between the inlet optics (3 ) and the second sub-layer (6 ") is arranged. Projection device (1) according to claim 1, wherein the second sub-layer (6 ") consists of black photoresist. Projection device (1) according to claim 1 or 2, wherein the reflective metallic first sub-layer of aluminum, chromium, and / or black chrome, alternatively magnesium, titanium, tantalum, molybdenum, iron, copper, nickel, palladium, silver, zinc, antimony , Tin, arsenic or bismuth. Projection device (1) according to one of the preceding claims, wherein the at least one support (5) consists at least partially of glass. Projection device (1) according to one of the preceding claims, wherein the entry and exit optics (3,4) are fixedly connected to the at least one carrier (5). Projection device (1) according to one of claims 1 to 4, wherein two or more carriers (5, 8, 8 ') are arranged between the entry and the exit optics (4), the entry optics (3) and the exit optics (4). each with a carrier (5, 8, 8 ') are firmly connected. Projection device (1) according to one of the preceding claims, wherein opaque coating has a transmittance T less than 0.001, preferably less than 0.0002. Projection device (1) according to one of the preceding claims, wherein the reflective metallic first sub-layer (6 ') for light in a wavelength range between 400 nm and 700 nm has a reflection coefficient of at least 0.55, preferably 0.85. Microprojection light module (10) for a motor vehicle headlight, comprising at least one projection device (1) according to one of the preceding claims and at least one light source for feeding light into the projection device. Microprojection light module (10) according to claim 9, wherein the light source comprises at least one LED, preferably a number of LEDs, each light source having a light collimating the LED of the parallel-aligning optics (7), which for the parallel irradiation into the entrance optics ( 3) is formed and arranged. Vehicle headlight, in particular motor vehicle headlight, comprising at least one microprojection light module (10) according to claim 9 or 10. Method for producing a projection device (1) according to one of Claims 1 to 8, comprising the following steps: I) drawing on and processing a translucent carrier for forming at least a first diaphragm device (6) with an optically effective surface, according to the following sub-steps a) coating one side of the translucent carrier with a reflective metallic first partial layer (6 '), b) covering the first partial layer (6 ') over the entire area with a second partial layer (6 ") consisting of black light-absorbing photoresist, c) exposing and developing the second sub-layer (6 ") to form translucent windows within the second sub-layer (6") through which corresponding areas of the first sub-layer (6 ') are exposed, d) formation of congruent translucent windows (6b) corresponding to step c) in the first part-layer (6 ') by removing the corresponding regions of the reflective metallic first part-layer (6') by means of an etching or dissolving process, II) positioning of the carrier (5) obtained according to step I) between an entrance optics (3) and an exit optics (4), wherein the entrance optics (3) comprises a number of micro entrance optics (3a), which are preferably arranged in an array , and wherein the exit optics (4) comprises a number of micro exit optics (4a), which are preferably arranged in an array, wherein the first aperture device (6) is arranged such that substantially all entering the entrance optic (3) Light is directed to the diaphragm device (6), wherein in the optically effective surface (6a) for forming a predefinable light distribution translucent window (6b) according to sub-step Id) are formed by a superimposition of the first and second sub-layer (6 ', 6 ") are limited, wherein the first part-layer (6 ') between the entrance optics (3) and the second Teilschich t (6 ") is arranged. The method of claim 12, wherein the full-surface coverage of the first sub-layer (6 ') according to step with a second light-absorbing photoresist second sub-layer (6 ") according to sub-step I-b) is applied by spin coating or spray coating. The method of claim 12 or 13, wherein the layer thickness of the second sub-layer (6 ") is between 0.5 and 4 microns, preferably 1.5 microns. Method according to one of claims 12 to 14, wherein the layer thickness of the first part-layer (6 ') is between 100 and 400 nanometers, preferably 200 nanometers.

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