EP3608585A1 - Projection device from a plurality of micro-optics systems and a light module for a motor vehicle headlamp - Google Patents

Abstract

Projection device (2) for a light module (1) of a motor vehicle headlight, which is formed from a plurality of micro-optic systems (3) arranged in a matrix, each micro-optic system (3) having a micro-entry optic (30), one of the micro-entry optics ( 30) assigned micro exit optics (31) and a micro diaphragm (32), all micro entry optics (31) one entry optics (4), all micro exit optics (31) one exit optics (5) and the micro diaphragms (32) form a diaphragm device (6), the diaphragm device (6) being arranged in a plane which is essentially orthogonal to the main emission direction (Z) of the projection device (2) and the entrance optics (4), the exit optics (5) and the diaphragm device (6) are arranged in substantially mutually parallel planes, the entirety of the micro-optical systems (3) being subdivided into at least two micro-optical system groups (G1, G2, G3), the micro-diaphragms (32) of the micro -op tic systems (3) of each micro-optical system group (G1, G2, G3) by light of at least one light wavelength (λ _G1, λ _G2, λ <sub> G3 < / sub>) can be depicted sharply from a given light wavelength range and the given light wavelength ranges are different for different micro-optical system groups (G1, G2, G3).

Description

The invention relates to a projection device for a light module of a motor vehicle headlight, which is formed from a plurality of micro-optic systems arranged in a matrix, each micro-optic system having a micro-entry optic, a micro-exit optic assigned to the micro-entry optic and one between the micro-entry optic and the micro-exit optics arranged micro-aperture, wherein all micro-entry optics an entry optics, all micro-exit optics form an exit optics and the micro-apertures form a diaphragm device, the diaphragm device being arranged in a plane substantially orthogonal to the main emission direction of the projection device and the entrance optics, the exit optics and the diaphragm device are arranged in planes which are essentially parallel to one another.

Furthermore, the invention relates to a light module with at least one such projection device.

Projection devices of the type mentioned above and light modules with such projection devices are known from the prior art.

The international registration WO 2015/058227 A1 the applicant shows a micro-projection light module in which individual projection systems - projection devices - are strung together. With each individual projection system, a sharp image of an overall light distribution, for example a low-beam light distribution, is generated. A single micro-optical system, from which the projection systems are formed, is designed for the wavelength of approx. 555 nm, i.e. for the green color range. This range is sharply imaged, but all other wavelength ranges are blurred due to the chromatic aberration. With a low beam distribution, for example, this leads to the light-dark boundary being given a violet color fringe. With such a projection system, the color of the color fringe can only be adjusted by deliberately defocusing the projection systems by changing the position of the micro-exit optics. However, this leads, for example, to a large gap which is very visible to the naked eye between the low-beam light distribution and a partial high-beam light distribution (if the lens is defocused in the direction of the beam diaphragm) or that the color fringe becomes even bluer (if the lens is defocused away from the beam diaphragm (diaphragm device)). Other solutions such as achromatic lenses are too complex and expensive to manufacture because they require a certain combination of materials.

It is therefore the object of the present invention to eliminate the disadvantages of the prior art and to provide a projection device and a light module which compensate for the color fringing.

The object is achieved according to the invention with a projection device of the type mentioned above in that the entirety of the micro-optical systems is divided into at least two micro-optical system groups, the micro-diaphragms of the micro-optical systems of each micro-optical system group being illuminated at least one light wavelength from a predefined light wavelength range, preferably by light of a predefined light wavelength, can be depicted sharply and the predefined light wavelength ranges are different in different micro-optical system groups and preferably do not overlap.

As a result, each micro-optical system group is assigned one, preferably exactly one, light wavelength. Each micro-optical system group is thus characterized by a light wavelength from a predetermined light wavelength range, preferably by a predetermined light wavelength. It can also be said that one of the micro-optical system groups focuses only light of at least one light wavelength from a predetermined light wavelength range, preferably a predetermined light wavelength. Other micro-optical system groups are defocused with respect to the light of a light wavelength from this predetermined light wavelength range, preferably the predetermined light wavelength.

The light distributions generated with the aid of the projection device are formed as an overlay of a multiplicity of micro-light distributions - light distributions which are formed by individual micro-optic systems. Furthermore, each micro-optical system group is set up to form a partial light distribution. The partial light distributions are superimpositions of those micro light distributions that are made using the micro-optical systems belonging to the corresponding micro-optical system group are formed / shaped. The light distribution or the total light distribution is also a superposition of the partial light distributions of individual micro-optical system groups.

The above-mentioned sharp imaging of the micro-diaphragms, for example their optically active edges in the light of at least one light wavelength from the predetermined light wavelength range, preferably the predetermined light wavelength, results in micro-light-dark transitions or boundaries in the light image which have color fringes in different colors. By superimposing the micro-light-dark transitions or boundaries, the color fringes in the light image are also superimposed, whereby a color compensation effect is achieved in which the color of a color fringe is adapted to the overall light distribution or the overall light distribution. The predetermined light wavelength ranges, in particular the predetermined light wavelengths, are preferably selected such that a white color fringe is produced.

This enables color compensation without achromatic, special positioning of the micro exit optics, an additional process step or additional components.

In addition, it can advantageously be provided that in each micro-optical system the micro-diaphragm is spaced a distance from the micro-exit optic, the distance being dependent on the at least one light wavelength from a predetermined light wavelength range, preferably on a predetermined light wavelength is essentially the same within the same micro-optical system group, the distances between the micro-optical systems from different micro-optical system groups being different.

This means that within one and the same micro-optical system group, the micro-diaphragms can be spaced the same distance from the respective micro-exit optics, this distance according to at least one light wavelength from the predetermined light wavelength range assigned to this micro-optical system group, preferably at least one predetermined light wavelength is selected. The micro-optical systems can consist of two or more different micro-optical system groups have two or more different distances between their micro-diaphragms and the respective micro-exit optics. Each micro-optical system group can be set up to sharply image micro-diaphragms in the light of at least one light wavelength from a predetermined light wavelength range, preferably a predetermined light wavelength.

Furthermore, it can be expedient if differences between the distances in different micro-optical system groups are from about 0.01 mm to about 0.12 mm, preferably from about 0.01 mm to about 0.06 mm, in particular from about 0.01 mm to about 0.03 mm, the micro exit optics having an intersection - the distance between the focal point and the light entry surface - which depends on the at least one light wavelength from a predetermined light wavelength range and on its diameter.

For example, micro exit optics can be designed for green light. If, for example, the micro-exit optics are designed as plano-convex lenses with a lens diameter of approximately 2 mm, they can have an intersection of approximately 0.7 mm ("green focal point") for light with a light wavelength of approximately 555 nm ("green light") ") have (see example in the figure description).

It should be noted at this point that the position of the micro-diaphragms in a micro-optical system group can be matched to a predetermined light wavelength range assigned to this micro-optical system group, preferably to a light wavelength. For example, if the micro-optics system group is to image the micro-diaphragms for green light (from the green region of the spectrum with light wavelengths from approximately 490 nm to approximately 575 nm: λ ∼ 490 - 575 nm, in particular λ ∼ 555 nm) determines the position of the intermediate image plane for these wavelengths and then positions the micro-diaphragms of the micro-optical system group in the green intermediate image plane or in the intersection of the green rays with the optical axis of the micro-exit optics. The micro-diaphragms are at a distance from the micro-exit optics, which is matched to the green light and is therefore related to the corresponding light wavelength.

The optically active edges within the same micro-optical system group can be sharply imaged with light from a predetermined light wavelength range, preferably a predetermined light wavelength. This means that the light-dark transition (transitions) generated by the optically effective edges, for example light-dark boundary (s), has a color fringe of a corresponding color.

It can advantageously be provided that the micro-exit optics of each micro-optic system have a light exit surface with a predetermined curvature, the predetermined curvature (the value of the predetermined curvature) of the at least one light wavelength from a predetermined light wavelength range, preferably one of the depends on predetermined light wavelengths and is essentially the same within the same micro-optical system group, the predetermined curvatures being different in the micro-optical systems from different micro-optical system groups.

In addition, it can be provided that at least some of the micro-diaphragms of each micro-optical system group have optically effective edges, which are designed to represent an essentially horizontal (with or without increase in asymmetry) micro-light-dark boundary.

There can be further advantages here if the micro-light-dark limits in different micro-optical system groups can be depicted sharply by light of the different light wavelengths.

With regard to accommodating the micro-optical system group in a motor vehicle headlight, it can be useful if the different micro-optical system groups are formed separately from one another and are preferably spaced apart from one another.

Furthermore, it can advantageously be provided that the micro-diaphragms of each micro-optical system group are combined to form a micro-diaphragm group and the micro-diaphragm groups are of identical design, each micro-diaphragm preferably being a plate an opaque material with an opening is formed, in particular each micro-aperture along the main radiation direction a finite Thickness, for example from about 0.01 mm to about 0.12 mm, preferably from about 0.06 mm.

In addition, the above-mentioned object is achieved with a light module with at least one projection device according to the invention, the light module also having a light source, the projection device being arranged downstream of the light source in the light emission direction and essentially all of the light generated by the light source in an area in front of the light module projected in the form of a light distribution with a light-dark boundary, the light distribution being formed from a multiplicity of overlapping partial light distributions each with a partial light-dark boundary and each partial light distribution being formed by exactly one micro-optical system group is.

Furthermore, it can be provided that each partial light-dark boundary has a color fringe of a predetermined color and different partial light-dark borders have color fringes of different colors.

It may be expedient if the partial light-dark boundaries and the light-dark boundary run essentially straight, for example horizontally or vertically, or have an asymmetry increase, each color of a light wavelength from a predetermined light wavelength range, preferably a predetermined light wavelength equivalent.

In a practice-proven embodiment it can be provided that the light source is set up to generate collimated light.

In addition, it can advantageously be provided that the light source comprises a light-collimating optical element and a preferably semiconductor-based lighting element, for example an LED light source, located in front of the light-collimating optical element, the light-collimating optical element being, for example, a collimator or a light-collimating front lens or a TIR lens ,

In addition, it can be provided that the light source has at least two light-emitting areas, each individual light-emitting area being controllable, for example, on and off, independently of the other light-emitting areas of the light source, and each light-emitting area having at least one, preferably exactly one, micro-optical system system. Group is assigned such that of the respective light-emitting area generated light directly and only hits the micro-optical system group assigned to this light-emitting area. This enables dynamic adjustment, ie adjustment in operation of the light module, of the color of the color fringe of the light-dark boundary.

• Fig. 1 eine Beleuchtungsvorrichtung mit einer Projektionseinrichtung aus mehreren Mikro-Optiksystemen in perspektivischer Ansicht;
• Fig. 1a Explosionsdarstellung eines der Mikro-Optiksysteme der Figur 1;
• Fig. 1b ein Schnitt A-A des Mikro-Optiksystems der Figur 1a;
• Fig. 2 und 3 Mikro-Optiksystem-Gruppen mit unterschiedlich beabstandeten Mikro-Blenden und Mikro-Austrittsoptiken;
• Fig. 4 ein Mikro-Optiksystem mit einer endlich dicken Mikro-Blende;
• Fig. 5 Mikro-Optiksystem-Gruppen mit unterschiedlich gekrümmten Lichtaustrittsflächen der Mikro-Austrittsoptiken;
• Fig. 6 verschiedene Formen von Mikro-Blenden und Mikro-Lichtverteilungen, und
• Fig. 7 eine Abblendlichtverteilung mit einer asymmetrischen Hell-Dunkel-Grenze.

The invention and further advantages are explained in more detail below with reference to exemplary embodiments which are illustrated in the drawing. In this shows

• Fig. 1 an illumination device with a projection device from several micro-optical systems in a perspective view;
• Fig. 1a Exploded view of one of the micro-optical systems of the Figure 1 ;
• Fig. 1b a section AA of the micro-optical system Figure 1a ;
• 2 and 3 Micro-optical system groups with differently spaced micro diaphragms and micro exit optics;
• Fig. 4 a micro-optics system with a finally thick micro-aperture;
• Fig. 5 Micro-optical system groups with differently curved light exit surfaces of the micro exit optics;
• Fig. 6 various forms of micro-shutters and micro-light distributions, and
• Fig. 7 a low beam distribution with an asymmetrical cut-off line.

The figures are schematic representations which only show those components which can be helpful for an explanation of the invention. The person skilled in the art immediately recognizes that a projection device and a light module for a motor vehicle headlight can have a large number of further components, not shown here, such as setting and adjustment devices, electrical supply means and much more.

The figures are provided with reference axes to simplify legibility and where appropriate. These reference axes relate to a professional installation position of the subject matter of the invention in a motor vehicle and represent a motor vehicle-related coordinate system.

In addition, it should be clear that direction-related terms such as "horizontal", "vertical", "top", "bottom" etc. are to be understood in the context of the present invention in a relative meaning and either refer to the above-mentioned technical Install position of the subject matter of the invention in a motor vehicle or to a customary alignment of a radiated light distribution in the photograph or in the traffic area.

Thus, neither the reference axes nor the direction-related terms are to be interpreted restrictively.

Figure 1 shows a lighting device 1 for a motor vehicle headlight, which can correspond to the light module according to the invention. The lighting device 1 comprises a projection device 2, which is formed from a multiplicity of micro-optic systems 3 arranged in a matrix, each micro-optic system 3 having a micro-entry optic 30, a micro-exit optic 31 assigned to the micro-entry optic 30 and one between the micro- Entry optics 30 and the micro-exit optics 31 arranged micro-aperture 32 . Figure 1 It can be seen that the matrix-like arrangement of the micro-optical systems 3 extends in two directions X (horizontal) and Y (vertical) which are substantially orthogonal to the main emission direction Z. That in the Figures 1, 1a and 1b As described above, the coordinate system shown is related to the lighting device 1 in its normal installation position.

With the lighting device 1, light distributions can be generated which are a superimposition of a plurality of micro light distributions (as for example in FIG Figure 6 ) - Light distributions that are formed by individual micro-optical systems - are formed. Figure 7 shows an example of such a light distribution, which is designed as a low-beam light distribution 8 with a light-dark boundary with an asymmetry increase 80 . If micro-optic systems are grouped into certain micro-optic system groups (see below or above), then each micro-optic system group is set up to form a partial light distribution. The partial light distributions are also superimpositions of several micro light distributions. The light distribution or the total light distribution is a superposition of partial light distributions.

Each micro-optic system 3 preferably consists of exactly one micro-entry optic 30, exactly one micro-exit optic 31 and exactly one micro-aperture 32 ( Figure 1a ). In this case, all micro-entry optics 30 form, for example, one-piece entry optics 4. Analogously, all micro-exit optics 31 form, for example, one-piece exit optics 5 and the micro-shutters 32 form, for example, one-piece aperture devices 6. Thus, the entry optics 4, the exit optics 5 and the aperture device 6 a projection device 2, for example in one piece. However, it is entirely conceivable that the projection device 2 is not designed in one piece. The micro entry optics 30, the micro exit optics 31 and the micro diaphragms 32 can, for example, be applied to one or more, preferably translucent, substrate (s) 40, 50, 51, 52, 60, for example made of glass or plastic.

The diaphragm device 6 is arranged in a plane which is essentially orthogonal to the main emission direction Z of the projection device 2 - in the intermediate image plane 322 . Thus, all of the micro-diaphragms 32 are also located in the intermediate image plane 322. The entry optics 4, the exit optics 5 and the diaphragm device 6 are arranged in planes which are essentially parallel to one another.

Figure 1a schematically shows an enlarged exploded view of one of the micro-optical systems 3 of FIG Figure 1. Figure 1b shows section AA of the Figure 1a , The substrates 40, 50, 51, 52, 60 have been omitted in this illustration for the sake of simplicity. The Figure 1a shows that the micro-aperture 32 can have an optically effective edge 320 . The micro diaphragm 32 is spaced apart from the micro exit optics 31 by a distance d . The optically effective edge 320 can be set up or designed to generate the light-dark boundary of the micro-light distribution - a so-called micro-light-dark boundary 3200, 3201 (see Figure 6 ). At this point it should be on Figure 6 Be referenced. Figure 6 shows various shapes of the optically active edges 320a, 320b, 320c, 320d, 320e of a micro-aperture 32, as well as micro-light distributions corresponding to these shapes, which for example have a substantially horizontal micro-light-dark boundary 3201 or a micro-light-dark boundary with an asymmetry increase 3201.

A micro light distribution is formed by light passing through the respective micro optical system 3. Each micro-optical system 3 therefore preferably forms exactly one micro-light distribution and vice versa: each micro-light distribution is preferably formed by exactly one micro-optical system 3. The optically effective edge 320, 320a, 320b, 320c, 320d, 320e can have different courses. If the micro-aperture 32, as in Figure 1b shown as an opening 321, 321a, 321b, 321c, 321d, 321e in an otherwise opaque plate, the optically active edge 320, 320a, 320b, 320c, 320d, 320e, which in this case is designed as a breakthrough limit, a closed form (see also Figure 6 ). At least part of the optically active edge 320, 320a, 320b, 320c, 320d, 320e is set up / formed for shaping / forming the micro-light-dark boundary 3200, 3201. In the in the Figures 1a and 6 Micro-shutters shown is the lower part of the optically active edge 320, 320a, 320b, 320c, 320d, 320e.

The person skilled in the art immediately recognizes that technical features relating to the geometric shape of the light distributions (including the partial light distributions and the micro light distributions) relate to a two-dimensional projection of the respective light distribution. This projection can be created, for example, in a lighting technology laboratory if the light distribution is projected onto a measuring screen, which is set up approximately 25 meters away orthogonal to the main emission direction of a light module, a lighting device or a motor vehicle headlight that is positioned in a customary installation position. The above is to be applied accordingly to light-dark borders (partial or micro-light-dark borders).

Due to the chromatic aberration, the optically effective edge 320, 320a, 320b, 320c, 320d, 320e is only sharply imaged with light of a specific color or a specific wavelength.

For example, in the case of a micro-optics system 3 with a micro-exit optics 31, which has an intersection of approximately 0.7 mm for rays with a light wavelength of approximately 555 nm (light from the green spectral range), the optically effective edge 320, 320a, 320b, 320c, 320d, 320e of the micro diaphragm 32, which is spaced by this focal distance from the micro exit optics 31 (the distance d is equal to the focal length in this case), in the form of a micro-light-dark boundary with a Violet color fringe shown when the micro-optical system is irradiated with white light, for example a semiconductor-based light source, preferably an LED light source. The violet color of the color fringe is due to a mixture of blue and red components of the white light. The distance d is changed by shifting the micro-aperture 32 along the main emission direction Z. This also changes the color of the color fringe, because the micro-diaphragm no longer lies at an intersection of the green rays (light rays from with a light wavelength from the green spectral range) with the optical axis of the micro-exit optics, but rather at an intersection of the red or the blue (light) rays with the optical axis of the micro exit optics. The distance d can therefore be selected as a function of the light wavelength λ _d . This example gives a general statement: if all micro-optical systems of the projection device are identical, light-dark transitions of a light distribution generated with the projection device, for example light-dark boundary of a low beam distribution, have a color fringe in a color that is different from the distance d the micro-aperture depends on the micro-exit optics. The color of this color fringe results from mixing light of the wavelengths for which the micro-diaphragms are not in the focal plane (chromatic aberration).

In order to counter the problem of the color fringe and to compensate for it, the entirety of the micro-optical system 3 is divided into at least two micro-optical system groups G1, G2, G3 . Figure 1 shows for example three micro-optical system groups G1, G2, G3. Each micro-optical system group G1, G2, G3 is assigned a predetermined light wavelength range (eg green range), preferably a predetermined light wavelength λ _G1 , λc ₂ , λ _G3 . This means that each micro-optical system group includes micro-optical systems whose micro-diaphragms can only be emitted by light with light wavelengths λ _G1 , λ _G2 , λ _G3 from the specified light wavelength range, preferably by light of a specified light wavelength (e.g. of approximately 555 nm) can be depicted sharply. According to the invention, the predetermined light wavelength ranges, preferably the predetermined light wavelengths λ _G1 , λ _G2 , λ _G3 , of different micro-optical system groups G1, G2, G3 are different. It can be expedient that the different light wavelength ranges do not overlap. Through the above Sharp images of the micro-diaphragms 32 or their optically active edges 320, 320a, 320b, 320c, 320d, 320e in the light of at least one light wavelength from the specified light wavelength range, preferably the specified light wavelength λ _G1 , λ _G2 , λ _G3 , arise in the micro photo -Light-dark transitions or - borders that have color fringes in different colors. By superimposing the micro-light-dark transitions or boundaries, the color fringes in the light image are also superimposed, whereby a color compensation effect is achieved in which the color of a color fringe is adapted to the overall light distribution or the overall light distribution. The predetermined light wavelength ranges, in particular the predetermined light wavelengths, are preferably selected such that a white color fringe is produced.

The micro-diaphragms 32 of each micro-optical system group G1 , G2, G3 can be combined to form a micro-diaphragm group, whereby the micro-diaphragm groups can be of identical design.

Furthermore, it can be provided that in each micro-optics system 3 at least a part of the micro-aperture 32 is spaced from the micro-exit optics 31 by a distance d, d1, d2, d3, the distance d, d1, d2, d3 from a light wavelength λ _d , λ _G1 , λ _G2 , λ _G3 from a predetermined light wavelength range or from one of the predetermined light wavelength range and is essentially the same within the same micro-optical system group G1, G2, G3. The distances d1, d2, d3 can be selected differently in the micro-optical systems 3 from different micro-optical system groups G1, G2, G3. This means that within one and the same micro-optical system group G1, G2, G3, the micro-diaphragms 32 are spaced the same distance from the respective micro-exit optics, this distance d1, d2, d3 according to a light wavelength from the predetermined, this micro-optical system group G1, G2, G3 assigned light wavelength range, preferably the predetermined light wavelength λ _G1 , λ _G2 , λ _{G3 is} selected. The micro-optical systems 3 from two or more different micro-optical system groups G1, G2, G3 have two or more different distances d1, d2, d3 between their micro-diaphragms 32 and the respective micro-exit optics 31. Each micro-optical system group G1, G2, G3 is set up, micro-aperture 32 in the light of the at least one light wavelength to sharply image a predetermined light wavelength range, preferably a predetermined light wavelength.

In the above example relating to the violet color fringe, the micro-aperture is sharply imaged by green light with a light wavelength of approx. 555 nm.

The differences Δd ₁₂ , Δd ₂₃ between the distances d1, d2, d3 in different micro-optical system groups G1, G2, G3 can be approximately 0.01 mm to approximately 0.12 mm, preferably from approximately 0.01 mm to approximately 0 .06 mm, in particular from about 0.01 mm to about 0.03 mm. The micro exit optics 31 for green light, in particular for light with a light wavelength of approximately 555 nm, preferably have an intersection of approximately 0.7 mm.

It should be noted at this point that the position of the micro-diaphragms in a micro-optical system group can be matched to a predetermined light wavelength range assigned to this micro-optical system group, preferably to a light wavelength. For example, if the micro-optics system group is to image the micro-diaphragms for green light (from the green region of the spectrum with light wavelengths from approximately 490 nm to approximately 575 nm: λ ∼ 490 - 575 nm, in particular λ ∼ 555 nm) determines the position of the intermediate image plane for these wavelengths and then positions the micro-diaphragms of the micro-optical system group in the green intermediate image plane or in the intersection of the green rays with the optical axis of the micro-exit optics. The micro-diaphragms are at a distance from the micro-exit optics, which is matched to the green light and is therefore related to the corresponding light wavelength.

In the case of another group of micro-optical systems, the position of the micro-diaphragms is determined as a function of the light wavelength from a different light wavelength range of the spectrum. Other areas of the spectrum are, for example: violet area (violet light) with a light wavelength of about 380 nm to about 420 nm (λ ∼ 380 - 420 nm); blue area (blue light) with light wavelength from about 420 nm to about 490 nm (λ ∼ 420 - 490 nm); yellow area (yellow light) with light wavelength of about 575 nm to about 585 nm (λ ∼ 575 - 585 nm); orange area (orange light) with light wavelength from about 585 nm to about 650 nm (λ ∼ 585 - 650 nm), and red area (red light) with light wavelength from about 650 nm to about 750 nm (λ ∼ 650 - 750 nm)

Thus, the optically active edges 320, 320a, 320b, 320c, 320d, 320e within the same micro-optical system group can be sharply imaged with light from a predetermined light wavelength range, preferably a predetermined light wavelength. That is, the light / dark transition (transitions) generated by the optically active edges 320, 320a, 320b, 320c, 320d, 320e, for example light / dark boundary (s), has one Color fringe of a corresponding color. Referring to the example mentioned above, a shift of the micro-aperture (green focal point) spaced about 0.7 mm from the micro exit optics leads in the horizontal direction to the micro exit optics or away from the micro exit optic Micro exit optics to a red or a blue color border at the micro-light-dark transition or the border. For example, shifting the micro-aperture by 0.03mm to the micro-exit optics (or the micro-exit optics to the micro-aperture results in an orange colored border). A superimposition of the color fringes in different colors in the photograph leads to a clear compensation of the color fringe. For example, a yellow-reddish color fringe can be overlaid with a violet color fringe and thereby produce an essentially white color fringe - compensation. This can be achieved, for example, with a projection device which comprises two micro-optical system groups, which consist of an equal number of micro-optical systems, the micro exit optics of a micro-optical system group being approximately 0.06 mm thicker than that of others. The sharpness factor can then be adjusted to the light distribution.

The different distances d1, d2, d3 in the different micro-optical system groups G1, G2, G3 can be achieved, for example, by different thicknesses of the micro-exit optics 32 themselves, the corresponding substrates or the corresponding adhesive layers between the corresponding substrate and the micro-exit optics.

Figure 1 reveals that the micro exit optics 32 are applied to a substrate 50, 51, 52. The substrate 50, 51, 52 has a different thickness depending on the micro-optical system group G1, G2, G3. The thickness of the substrate 50, 51, 52 in the corresponding micro-optical system group G1, G2, G3 defines the distances d1, d2, d3 between the micro-diaphragms 32 and the micro exit optics 31 of this micro-optical system group G1, G2, G3. It is also conceivable to design the substrate 60 of the diaphragm device 6 or the substrate 40 of the entrance optics 4 for the different micro-optical system groups G1, G2, G3 to have different thicknesses.

In Figures 2 and 3 it can be seen that the different distances d1, d2, d3 also with an adhesive layer 53 of a thickness Δd , for example from 0.01 mm to approximately 0.12 mm, preferably from approximately 0.01 mm to approximately 0.06 mm, in particular from about 0.01 mm to about 0.03 mm can be achieved. This somewhat thicker adhesive layer can, for example, be located between the micro exit optics 31 and the substrate 50 of the exit optics 5 or between the micro diaphragms 32 and the substrate 50 of the exit optics 5.

It is also conceivable (see Figure 4 ) to manufacture the micro-diaphragms of a thickness D, so that, for example, a rear, with respect to the micro-exit optics 31 (in the main emission direction Z) distal part 32a of its optically active edges is sharply imaged with light of a first light wavelength λ _G11 from the predetermined light wavelength range and a front part 32b of its optically active edges, which is proximal to the micro-exit optics 31, is sharply imaged with light of a second light wavelength λ _G12 from the predetermined light wavelength range. That is, the distal part 32a at an intersection S _{λ G 11} the rays of the light wavelength λ _G11 with the optical axis OA of the micro-optical system 3 and the proximal part 32b at an intersection S _{λ G 12} the rays of light wavelength λ _{G12 are arranged} with the optical axis OA of the micro-optical system 3.

Referring to the above example of the micro-optic system with a micro-exit optic 31, which has an intersection of approximately 0.7 mm for beams with a light wavelength of approximately 555 nm (light from the green spectral range), the micro-aperture 32 can be approximately 0 , 12 mm thick, whereby its center can be spaced from the micro exit optics 31 by approximately 0.7 mm. The distal part 32a of the optically active edge of the micro-aperture 32 becomes an intersection point S _{λ G 11} the red rays with the optical axis OA of the micro exit optics 31 and the proximal part 32b of the optically active edge of the micro diaphragm 32 at an intersection S _{λ G 12} , the blue rays with the optical axis OA of the micro exit optics. Different parts of the optically Effective edges, such as the distal or proximal part, are superimposed in the form of micro-light-dark transitions or borders with color fringes in different colors in the photo. This overlay can also compensate for the color fringe of the cut-off line.

With regard to the simplicity of production, however, micro-exit optics of different thicknesses - whether achieved by a thicker substrate, thicker adhesive layer or thicker micro-exit optic body - are preferred. Micro-diaphragms of different thicknesses can only be produced using an application method (lithographic) and lead to an air gap in the projection device. Micro-panels of different thicknesses cannot be connected to flat glass plates, such as those used in the imprint process. Micro-exit optics of different thicknesses (corresponding to a shift in the refractive surface) can, however, be easily manufactured using a tool.

In addition, it can be provided that the micro exit optics 31 of each micro optic system 3 have a light exit surface with a predetermined curvature k1, k2 , the predetermined curvature k1, k2 (the value of the predetermined curvature) of a light wavelength from a predetermined light wavelength range or from one of the predetermined light wavelength ranges, preferably depending on one of the light wavelengths λ _G1 , λ _G2 , λ _G3 and is essentially the same within the same micro-optical system group G1 , G2, G3, the predetermined curvatures k1, k2 for the micro- Optical systems 3 from different micro-optical system groups G1 , G2, G3 are different.

By changing the curvatures k1, k2 of the light exit surfaces of the micro exit optics 31, the focal lengths (for all colors) of the micro exit optics 31 can be changed. Therefore, the micro-optic systems 3 with micro exit optics 31, which have differently curved light exit surfaces, have different focal lengths for a predetermined light wavelength λ. Figure 5 shows schematically two micro exit optics 31 from different micro optic system groups G1 , G2 and these micro exit optics 31 upstream micro diaphragms 32. It should be noted that the micro diaphragms in this example are at the same distance from the micro exit optics 31 are arranged. It is understood that this is not a limitation. The distance between the micro-aperture and the micro-exit optics can also vary here, as described above and be adapted to the light wavelength. The light exit surfaces of the micro exit optics 31 of the Figure 5 are curved differently. This means that the micro-diaphragms 32 of the micro-optical system 3 of a first micro-optical system group G1 at an intersection S _{λ G 1} the rays of the light wavelength λ _G1 with the optical axis OA of the corresponding micro-optical system 3 and the micro-diaphragms 32 of the micro-optical systems 3 of a second micro-optical system group G2 at an intersection S _{λ G 2} the rays of light wavelength λ _{G2 can be located} with the optical axis OA of the corresponding micro-optical system 3. As a result, the optically effective edges of the micro-diaphragms 32 are imaged as micro-light-dark transitions or boundaries 3200, 3201 with color fringes in different colors. As already mentioned, the light wavelengths can be selected in such a way that the color fringing that occurs after the overlay is white.

It goes without saying that these exemplary embodiments can be combined with one another. For example, it may be expedient not only to vary the position of the micro-diaphragms (the distance d1, d2, d3 between the micro-diaphragm and the respective micro-exit optics) from micro-optical system group to micro-optical system group, but rather also change the curvatures k1, k2 of the light exit surfaces of the micro exit optics. For example, the total thickness of the projection device can also influence the elongated extent of the entire light module in which the projection device is used, and thus, for example, the overall depth can be adjusted. For example, it is quite conceivable for the micro-optical systems 3 of Figure 5 an adhesive layer like in the Figures 2 or 3 or a thicker substrate like in Figure 1 provided.

As already mentioned shows Figure 6 Examples of micro-diaphragms 32 with differently shaped openings 321a, 321b, 321c, 321d, 321e and of micro-light distributions that can be generated by the respective shape of the opening. Figure 6 reveals two different forms of micro-light-dark boundaries: an essentially horizontal micro-light-dark boundary 3201 and a micro-light-dark boundary with an asymmetry increase 3201. As explained above, a superposition of the micro-light distributions of the same micro-optical system group are formed in the light image a partial light distribution which has a partial light-dark boundary with a color fringe of a predetermined color, the predetermined color depending on the predetermined light wavelength range, preferably on the predetermined light wavelength , The partial light distributions that overlap in the photograph form a light distribution or total light distribution, such as the low beam 8 in the Figure 7 , The micro-light distributions with the micro-light-dark boundaries having the asymmetry increase 3201 lead to partial light-dark limits with an asymmetry increase, each partial light-dark boundary having the color fringe in the predetermined color. This forms the light-dark boundary with the asymmetry increase 80, the color fringe of which has a color which is determined by the colors of the color fringes of the partial light distribution. The color of the color fringe of the light-dark boundary with the asymmetry increase 80 in the low-beam light distribution 8 is preferably white.

Although not shown in the figures, the different micro-optical system groups can be designed separately from one another. It is conceivable that the different micro-optical system groups are spaced apart. The entrance optics, the exit optics and the diaphragm device can be arranged on separate, preferably transparent substrates.

Beyond that Figure 1 It can be seen that the lighting device 1 for a motor vehicle headlight of a light source 7, which is upstream of the projection device 2 in the light emission direction Z. The light source 7 emits light which is projected by means of the projection device 2 into an area in front of the lighting device in the form of a light distribution, for example a low-beam light distribution 8 with a light-dark boundary, for example a light-dark boundary with an asymmetry increase 80.

As mentioned above, the light distribution is formed from a multiplicity of overlapping partial light distributions, each with a partial light-dark boundary. Each partial light distribution is formed by exactly one micro-optical system group.

The light source 7 can expediently be set up to generate collimated light.

For example, the light source 7 can be a light-collimating optical element, such as a collimator 9 in Figure 1 and a preferably semiconductor-based lighting element, for example an LED light source 10, located in front of the collimator 9. The light-collimating optical element can also be designed as a light-collimating front lens or a TIR lens (not shown).

In addition, in Figure 1 to recognize that the light source 7 has three light-emitting regions 70, 71, 72. Each individual light-emitting area can be one or more semiconductor-based light sources, preferably LED light sources, and can be controlled, for example switched on and off, independently of the other light-emitting areas of the light source 7. Furthermore, it may be expedient to assign at least one, preferably exactly one, micro-optical system group G1 , G2, G3 to each light-emitting region 70, 71, 72 in such a way that light generated by the respective light-emitting region 70, 71, 72 is directly and only on hits the micro-optical system group G1 , G2, G3 assigned to this light-emitting region 70, 71, 72.

The foregoing discussion of the invention has been presented for purposes of illustration and description. The foregoing is not intended to limit the invention to the form or forms disclosed herein. For example, the foregoing detailed description summarizes various features of the invention in one or more embodiments for the purpose of streamlining the disclosure. This type of disclosure is not to be understood to reflect the intent that the claimed invention requires more features than is expressly stated in each claim. Rather, as the following claims reflect, inventive aspects exist in less than all of the features of a single embodiment described above.

Furthermore, although the description of the invention includes the description of one or more embodiments and certain variations and modifications, other variations and modifications are within the scope of the invention, e.g. B. Within the skills and knowledge of professionals, after understanding the present disclosure.

The reference numbers in the claims serve only for a better understanding of the present inventions and in no way mean a limitation of the present inventions.

Claims (15)

Projection device (2) for a light module (1) of a motor vehicle headlight, which is formed from a plurality of micro-optic systems (3) arranged in a matrix, each micro-optic system (3) having a micro-entry optic (30), one of the micro-entry optics ( 30) has associated micro exit optics (31) and a micro diaphragm (32), all micro entry optics (31) one entry optics (4), all micro exit optics (31) one exit optics (5) and the micro diaphragms (32) form a diaphragm device (6), the diaphragm device (6) being arranged in a plane that is essentially orthogonal to the main emission direction (Z) of the projection device (2) and the entry optics (4), the exit optics (5) and the diaphragm device (6) are arranged in substantially parallel planes,
characterized in that
the totality of the micro-optical systems (3) is divided into at least two micro-optical system groups (G1, G2, G3), the micro-diaphragms (32) of the micro-optical systems (3) of each micro-optical system group ( G1, G2, G3) can be sharply imaged by light from at least one light wavelength (λ _G1 , λ _G2 , λ _G3 ) from a predetermined light wavelength range and the predetermined light wavelength ranges are different for different micro-optical system groups (G1, G2, G3). Projection device according to claim 1, characterized in that in each micro-optical system (3) at least a part of the micro-diaphragm (32) is spaced from the micro-exit optical system (31) by a distance (d, d1, d2, d3), wherein the distance (d, d1, d2, d3) depends on the at least one light wavelength λ _d , λ _G1 , λ _G2 , λ _G3 ) from a predetermined light wavelength range and is the same within the same micro-optical system group (G1, G2, G3) is, the distances (d1, d2, d3) in the micro-optical systems (3) from different micro-optical system groups (G1, G2, G3) being different. Projection device according to claim 2, characterized in that differences (Δd ₁₂ , Δd ₂₃ ) between the distances (d1, d2, d3) in different micro-optical system groups (G1, G2, G3) are about 0.01 mm to about 0, 12 mm, preferably from about 0.01 mm to about 0.06 mm, in particular from about 0.01 mm to about 0.03 mm, the micro-exit optics (31) having an intersection that is based on the at least one light wavelength (λ _d , λ _G1 , λ _G2 , λ _G3 ) from a given light wavelength range and its diameter. Projection device according to one of claims 1 to 3, characterized in that the micro exit optics (31) of each micro optic system (3) has a light exit surface with a predetermined curvature (k1, k2), the predetermined curvature (k1, k2) depends on the at least one light wavelength (λ _G1 , λ _G2 , λ _G3 ) from a predetermined light wavelength range, preferably on one of the predetermined light wavelengths (λ _G1 , λ _G2 , λ _G3 ) and within the same micro-optical system group (G1, G2, G3) is the same, the predetermined curvatures (k1, k2) in the micro-optical systems (3) from different micro-optical system groups (G1, G2, G3) being different. Projection device according to one of Claims 1 to 4, characterized in that at least some of the micro-diaphragms (32) of each micro-optical system group (G1, G2, G3) have optically active edges (320, 320a, 320b, 320c, 320d, 320e), which are designed to image an essentially horizontal micro-light-dark boundary. Projection device according to claim 5, characterized in that the micro-light-dark limits in different micro-optical system groups can be depicted sharply by light of different light wavelengths (λ _G1 , λ _G2 , λ _G3 ). Projection device according to one of claims 1 to 6, characterized in that the different micro-optical system groups (G1, G2, G3) are formed separately from one another and are preferably spaced apart from one another. Projection device according to one of claims 1 to 7, characterized in that the micro-diaphragms (32) of each micro-optical system group (G1, G2, G3) are combined to form a micro-diaphragm group and the micro-diaphragm groups are of identical design, each micro-diaphragm (32) preferably being designed as a plate made of an opaque material with an opening (321, 321a, 321b, 321c, 321d, 321e), in particular each micro-diaphragm (32) along the Main emission direction (Z) has a finite thickness (D), for example from about 0.01 mm to about 0.12 mm, preferably from about 0.06 mm. Light module (1) for a motor vehicle headlight with a projection device (2) according to one of claims 1 to 8, and a light source (7), the projection device (2) being arranged downstream of the light source (7) in the light emission direction and from the light source (7) generated light is projected into an area in front of the light module in the form of a light distribution (8) with a light-dark boundary (80), the light distribution being formed from a plurality of overlapping partial light distributions, each with a partial light-dark boundary and each partial light distribution is formed by exactly one micro-optical system group. Light module for a motor vehicle headlight according to claim 9, characterized in that each partial light-dark boundary has a color fringe of a predetermined color and different partial light-dark borders have color fringes of different colors, each color having a light wavelength (λ _G1 , λ _G2 , λ _G3 ) from a predetermined light wavelength range, preferably a predetermined light wavelength (λ _G1 , λ _G2 , λ _G3 ). Light module according to claim 9 or 10, characterized in that the partial light-dark boundaries and the light-dark boundary run essentially straight, for example horizontally or vertically, or have an asymmetry increase (80). Light module according to one of claims 9 to 11, characterized in that the light source (7) is set up to generate collimated light. Light module according to one of Claims 9 to 12, characterized in that the light source (7) comprises a light-collimating optical element (9) and a preferably semiconductor-based lighting element (10), for example an LED light source, upstream of the light-collimating optical element (9), wherein the light-collimating optical element (9) is, for example, a collimator or a light-collimating front lens or a TIR lens. Light module according to one of Claims 9 to 13, characterized in that the light source (7) has at least two light-emitting regions (70, 71, 72), each individual light-emitting region being independent of the other light-emitting regions Areas of the light source (7) can be controlled, for example switched on and off, and each light-emitting area (70, 71, 72) is assigned at least one, preferably exactly one, micro-optical system group (G1, G2, G3) such that light generated in the respective light-emitting region (70, 71, 72) directly and only strikes the micro-optical system group (G1, G2, G3) assigned to this light-emitting region (70, 71, 72). Motor vehicle headlight with at least one light module according to one of claims 9 to 14.

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