阅读说明：本技术 用于机动车前照灯的由多个微型光学系统和光模块构成的投影装置 (Projection device for a motor vehicle headlight, comprising a plurality of micro-optical systems and a light module ) 是由 安德烈亚斯·莫泽 伯恩哈德·曼德尔 弗里德里希·鲍尔 于 2019-08-05 设计创作，主要内容包括：用于机动车前照灯的光模块(1)的投影装置(2),所述投影装置由多个矩阵状设置的微型光学系统(3)形成,其中每个微型光学系统(3)具有微型入射光学器件(30)、与微型入射光学器件(30)相关联的微型出射光学器件(31)以及微型光圈(32),其中所有微型入射光学器件(31)形成入射光学器件(4),所有微型出射光学器件(31)形成出射光学器件(5),以及所有微型光圈(32)形成光圈装置(6),其中光圈装置(6)设置在基本上与投影装置(2)的主放射方向(Z)正交的平面中,并且入射光学器件(4)、出射光学器件(5)和光圈装置(6)设置在基本上彼此平行的平面中,其中将微型光学系统(3)的整体划分为至少两个微型光学系统组(G1、G2、G3),其中每个微型光学系统组(G1、G2、G3)的所述微型光学系统(3)的微型光圈(32)能够通过预设的光波长范围中的至少一个波长(λ-G、λ-(G2)、λ-(G3))的光清晰地成像,并且预设的光波长范围在不同的微型光学系统组(G1、G2、G3)中是不同的。(Projection device (2) for a light module (1) of a motor vehicle headlight, formed by a plurality of micro-optical systems (3) arranged in a matrix, wherein each micro-optical system (3) has a micro-entrance optics (30), a micro-exit optics (31) associated with the micro-entrance optics (30), and a micro-aperture (32), wherein all micro-entrance optics (31) form the entrance optics (4), all micro-exit optics (31) form the exit optics (5), and all micro-apertures (32) form an aperture arrangement (6), which forms an aperture arrangement (6), and which has a plurality of micro-entrance optics (30), and a plurality of micro-exit optics (32), which are associated with the micro-entrance optics (The intermediate aperture arrangement (6) is arranged in a plane substantially orthogonal to the main emission direction (Z) of the projection device (2), and the entry optics (4), the exit optics (5) and the aperture arrangement (6) are arranged in planes substantially parallel to one another, wherein the entirety of the micro-optical system (3) is divided into at least two micro-optical system groups (G1, G2, G3), wherein the micro-apertures (32) of the micro-optical systems (3) of each micro-optical system group (G1, G2, G3) are capable of passing at least one wavelength (λ) of a preset range of light wavelengths G 、λ G2 、λ G3 ) Is imaged clearly and the preset light wavelength ranges are different in different groups of micro-optical systems (G1, G2, G3).)

1. A projection arrangement (2) for a light module (1) of a motor vehicle headlight, which is formed by a plurality of micro optical systems (3) arranged in a matrix, wherein each micro optical system (3) has a micro entry optics (30), a micro exit optics (31) associated with the micro entry optics (30) and a micro aperture (32), wherein all micro entry optics (31) form an entry optics (4), all micro exit optics (31) form an exit optics (5) and all micro apertures (32) form an aperture arrangement (6), wherein the aperture arrangement (6) is arranged in a plane substantially orthogonal to a main emission direction (Z) of the projection arrangement (2) and the entry optics (4), the exit optics (5) and the aperture arrangement (6) are arranged in planes substantially parallel to one another,

it is characterized in that the preparation method is characterized in that,

the entire micro-optical system (3) is divided into at least two micro-optical system groups (G1, G2, G3), wherein the micro-apertures (32) of the micro-optical system (3) of each micro-optical system group (G1, G2, G3) are capable of passing at least one wavelength (lambda) in a predetermined wavelength range_G1、λ_G2、λ_G3) Is imaged clearly and the preset light wavelength ranges are different in different groups of micro-optics (G1, G2, G3).

2. The projection device of claim 1,

it is characterized in that the preparation method is characterized in that,

in each micro-optical system (3), at least a part of the micro-aperture (32) is spaced apart from the micro-exit optics (31) by a distance (d, d1, d2, d3), wherein the distance (d, d1, d2, d3) is equal to at least one light wavelength (λ) in the predetermined light wavelength range_d、λ_G1、λ_G2、λ_G3) Related to and equal within the same micro-optics group (G1, G2, G3), wherein the spacing (d1, d2, d3) is different in micro-optics (3) consisting of different micro-optics groups (G1, G2, G3).

3. The projection device of claim 2,

it is characterized in that the preparation method is characterized in that,

the difference (Δ d) between the distances (d1, d2, d3) in the different groups of micro-optics (G1, G2, G3)₁₂、Δd₂₃) From about 0.01mm to about 0.12mm, preferably from about 0.01mm to about 0.06mm, in particular from about 0.01mm to about 0.03mm, wherein the micro-exit optics (31) have a top focal length which corresponds to at least one light wavelength (λ) in a predetermined light wavelength range_d、λ_G1、λ_G2、λ_G3) And its diameter.

4. The projection apparatus according to any one of claims 1 to 3,

it is characterized in that the preparation method is characterized in that,

the micro-exit optics (31) of each micro-optical system (3) has a light exit surface with a predetermined curvature (k1, k2), wherein the predetermined curvature is associated with at least one light wavelength (λ) in a predetermined light wavelength range_G1、λ_G2、λ_G3) In relation to, preferably one of said predetermined wavelengths of light (λ)_G1、λ_G2、λ_G3) Related to and identical within the same micro-optical system group (G1, G2, G3), wherein the preset curvatures (k1, k2) are different in micro-optical systems (3) composed of different micro-optical system groups (G1, G2, G3).

5. The projection apparatus according to any one of claims 1 to 4,

it is characterized in that the preparation method is characterized in that,

at least a portion of the micro-apertures (32) of each micro-optical system group (G1, G2, G3) have optically effective edges (320, 320a, 320b, 320c, 320d, 320e) configured for imaging a substantially horizontal micro-bright-dark boundary.

6. The projection device of claim 5,

it is characterized in that the preparation method is characterized in that,

passing different wavelengths of light (lambda)_G1、λ_G2、λ_G3) Can image the micro light and dark boundary clearly in different micro optical system groups.

7. The projection apparatus according to any one of claims 1 to 6,

it is characterized in that the preparation method is characterized in that,

the different groups of micro-optics (G1, G2, G3) are formed separately from one another and are preferably spaced apart from one another.

8. The projection apparatus according to any one of claims 1 to 7,

it is characterized in that the preparation method is characterized in that,

the micro-apertures (32) of each micro-optical system group (G1, G2, G3) are combined to form a micro-aperture group, and the micro-aperture groups are formed identically, wherein preferably each micro-aperture (32) is formed as a thin plate of a light-impermeable material having openings (321, 321a, 321b, 321c, 321D, 321e), wherein in particular each micro-aperture (32) has a limited thickness (D) in the main emission direction (Z), for example a thickness of about 0.01mm to about 0.12mm, preferably about 0.06 mm.

9. A 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), wherein the projection device (2) is located downstream of the light source (7) in the light emission direction and the light generated by the light source (7) is projected in the form of a light distribution (8) with a light-dark boundary (80) into an area located in front of the light module, wherein the light distribution is formed by a plurality of partial light distributions, each with a partial light-dark boundary, which are superimposed on one another and each formed by exactly one micro-optical system group.

10. Light module for a motor vehicle headlight according to claim 9,

it is characterized in that the preparation method is characterized in that,

each partial light and dark boundary has a gamut of preset colors, and different partial light and dark boundaries have gamuts of different colors, wherein each color corresponds to a light wavelength (λ) in a preset light wavelength range_G1、λ_G2、λ_G3) Preferably corresponding to a predetermined wavelength of light (λ)_G1、λ_G2、λ_G3)。

11. The light module according to claim 9 or 10,

it is characterized in that the preparation method is characterized in that,

the partial light-dark boundary and the light-dark boundary extend substantially straight, e.g. horizontally or vertically, or have an asymmetric elevation (80).

12. The light module according to any one of claims 9 to 11,

it is characterized in that the preparation method is characterized in that,

the light source (7) is designed to generate collimated light.

13. The light module according to any one of claims 9 to 12,

it is characterized in that the preparation method is characterized in that,

the light source (7) comprises an optical element (9) for collimating light and a preferably semiconductor-based light-emitting element (10), such as an LED light source, located upstream of the optical element (9) for collimating light, wherein the optical element (9) for collimating light is, for example, a collimator or a front-end optic or a TIR lens for collimating light.

14. The light module according to any one of claims 9 to 13,

it is characterized in that the preparation method is characterized in that,

the light source (7) has at least two light-emitting regions (70, 71, 72), wherein each individual light-emitting region can be controlled independently of the other light-emitting regions of the light source (7), for example can be switched on and off, and at least one, preferably exactly one, micro-optical system group (G1, G2, G3) is associated with each light-emitting region (70, 71, 72), so that the light generated by the respective light-emitting region (70, 71, 72) impinges directly and only on the micro-optical system group (G1, G2, G3) associated with the light-emitting region (70, 71, 72).

15. An automotive headlamp having at least one light module according to any of claims 9 to 14.

Technical Field

The invention relates to a projection device for a light module of a motor vehicle headlight, which is formed by a plurality of micro optical systems arranged in a matrix, wherein each micro optical system has a micro entry optics, a micro exit optics associated with the micro entry optics and a micro aperture arranged between the micro entry optics and the micro exit optics, wherein all the micro entry optics form the entry optics, all the micro exit optics form the exit optics and all the micro aperture form an aperture arrangement, wherein the aperture arrangement is arranged in a plane substantially orthogonal to a main radiation direction of the projection device and the entry optics, the exit optics and the aperture arrangement are arranged in planes substantially parallel to each other.

The invention further relates to a light module having at least one such projection device.

Background

Projection apparatuses of the above-mentioned type and light modules having such projection apparatuses are known from the prior art.

The applicant's international application WO 2015/058227 a1 shows a miniature projection light module in which the respective projection systems, projection devices, are connected in line with each other. A clear image of the overall light distribution, for example of the low beam distribution, is produced with each individual projection system. The design of the only micro-optical system forming the projection system is here realized for a wavelength of about 555nm, i.e. for the color range of green. This range is imaged clearly, while all other wavelength ranges are not imaged clearly due to chromatic aberration. In the case of a low beam distribution, this for example gives rise to: the light-dark boundary results in a purple color gamut. The color of the color gamut can only be set in such projection systems by deliberately defocusing the projection system by changing the position of the micro exit optics. But this, for example, leads to: a large, very clearly visible gap with the naked eye is created between the low-beam distribution and the part of the high-beam distribution (when the lens is defocused in the direction of the beam stop) or the color gamut becomes bluer (when the lens is defocused away from the beam stop (aperture means)). Other solutions, such as achromatic lenses, are too costly and expensive to manufacture because they require a specific combination of materials.

Disclosure of Invention

It is therefore an object of the present invention to obviate the drawbacks of the prior art and to provide a color gamut compensating projection device and a light module.

This object is achieved according to the invention by means of a projection device of the above-mentioned type in the following manner: the entire micro-optical system is divided into at least two micro-optical system groups, wherein the micro-apertures of the micro-optical systems of each micro-optical system group can be clearly imaged by light of at least one light wavelength of a preset light wavelength range, preferably by light of the preset light wavelength, and the preset light wavelength ranges are different in different micro-optical system groups and preferably do not overlap.

Thus, there is associated with each micro-optical system set one, preferably exactly one, wavelength of light. Each set of micro-optics is therefore characterized by a light wavelength in a predetermined light wavelength range, preferably by a predetermined light wavelength. Furthermore, it can also be said that one of the groups of micro-optical systems focuses light of at least one light wavelength in a predetermined light wavelength range, preferably a predetermined light wavelength. The other micro-optical system group performs defocusing with respect to light of a light wavelength in the preset light wavelength range, preferably light of a preset light wavelength.

The light distribution generated by means of the projection device is formed as a superposition of a plurality of micro-light distributions, the superposition of the light distributions being shaped by the individual micro-optical systems. Furthermore, each set of micro-optics is set up for shaping a partial light distribution. The partial light distribution is a superposition of these micro-light distributions formed/shaped by means of micro-optical systems belonging to the respective micro-optical system group. The light distribution or the overall light distribution is also a superposition of the partial light distributions of the individual groups of micro-optical systems.

The above-described sharp imaging by the micro-aperture, for example the light of which the optically effective edge is at least one light wavelength in the predetermined light wavelength range, preferably the light of the predetermined light wavelength, produces a micro light-dark transition or a micro light-dark boundary in the light image, which has a color gamut of different colors. By superimposing a micro light-dark transition or a micro light-dark boundary, the color gamut is also superimposed in the light image, thus achieving a color compensation effect, wherein the color of the entire light distribution or of the color gamut of the entire light distribution is adjusted. Preferably, the predetermined light wavelength range, in particular the predetermined light wavelength, is selected such that a white color gamut is produced.

It is thus possible to implement color compensation with the aid of achromatic lenses, specific positioning of the micro-exit optics, additional process steps or additional components.

It can furthermore be advantageously provided that in each of the micro-optical systems the micro-apertures are spaced apart from the micro-exit optics by a distance, wherein the distance is associated with at least one light wavelength of a predetermined light wavelength range, preferably a predetermined light wavelength, and is substantially equal within the same micro-optical system group, wherein the distances in the micro-optical systems formed by different micro-optical system groups are different.

This means that: within the same micro-optical system group, the micro-apertures can be spaced apart from the respective micro-exit optics by the same spacing, wherein the spacing is selected in dependence on at least one light wavelength of a preset light wavelength range associated with the micro-optical system group, preferably in dependence on at least one preset light wavelength. In this case, a micro-optical system consisting of two or more different groups of micro-optical systems can have two or more different distances between its micro-aperture and the respective micro-exit optics. Each group of micro-optical systems can be designed such that the micro-apertures clearly image in light of at least one light wavelength of the predetermined light wavelength range, preferably in light of the predetermined light wavelength range.

It is also expedient for the difference between the spacings in the different groups of micro-optics to be about 0.01mm to about 0.12mm, preferably about 0.01mm to about 0.06mm, in particular about 0.01mm to about 0.03mm, wherein the micro-exit optics have a focal length (schnittwite), the spacing between the focal point and the light entry face being dependent on at least one light wavelength and its diameter in the predetermined light wavelength range.

For example, the micro-exit optics can be designed for green light. If the micro exit optics are configured, for example, as plano-convex lenses with a lens diameter of about 2mm, the top focal length of the plano-convex lenses can be about 0.7mm ("green focus") for light with a wavelength of about 555nm ("green light") (see the example in the description of the figures).

It should be noted at this point that the position of the micro-aperture in the micro-optical system set can be coordinated with a predetermined light wavelength range, preferably with a light wavelength, wherein the light wavelength range is associated with the micro-optical system set. For example, if the micro-optics group is to image a micro-aperture for green light (from the green range of the spectrum with light wavelengths from about 490nm to about 575 nm: λ -490 nm-575nm, in particular λ -555 nm), the position of the intermediate image plane for said wavelengths is determined and subsequently the micro-aperture of the micro-optics group is positioned in the green intermediate image plane or at the intersection of the green beam with the optical axis of the micro-exit optics. The micro-aperture and the micro-exit optics have a distance which is coordinated with the green light and thus is dependent on the respective light wavelength.

The optically effective edges in the same set of micro-optics can be clearly imaged by means of light of a predetermined light wavelength range, preferably a predetermined light wavelength. That is, the light-dark transition(s) produced by the optically effective edge, e.g. the light-dark boundary(s), have a gamut of the respective colors.

It can advantageously be provided that the micro-exit optics of each micro-optical system have a light exit surface with a predetermined curvature, wherein the predetermined curvature (value of the predetermined curvature) is associated with at least one light wavelength in a predetermined light wavelength range, preferably with one of the predetermined light wavelengths, and is substantially identical within the same micro-optical system group, wherein the predetermined curvature is different in the micro-optical systems composed of different micro-optical system groups.

Furthermore, it can be provided that at least a part of the microapertures of each group of microoptics has an optically effective edge which is designed to image a substantially horizontal (with or without an asymmetrically raised) microbright-dark boundary.

Further advantages can be achieved here: the micro light and dark boundaries in different micro optical system groups can be imaged by light of different light wavelengths.

In this case, the micro-optical system groups can be arranged in the motor vehicle headlight, and the micro-optical system groups can be arranged in a row.

It can furthermore be advantageously provided that the micro-apertures of each micro-optical system group are combined to form a micro-aperture group and that the micro-aperture groups are formed identically, wherein preferably each micro-aperture is formed as a thin plate of a light-impermeable material with a recess, wherein in particular each micro-aperture has a limited thickness in the main emission direction, for example a thickness of approximately 0.01mm to approximately 0.12mm, preferably approximately 0.06 mm.

The object is also achieved by a light module having at least one projection device according to the invention, wherein the light module also has a light source, wherein the projection device is located downstream of the light source in the light emission direction, and substantially all of the light generated by the light source is projected in the form of a light distribution with a light-dark boundary into a region located in front of the light module, wherein the light distribution is formed by a plurality of partial light distributions each with a partial light-dark boundary, which are superimposed on one another, and each partial light distribution is formed by exactly one set of micro-optical systems.

Furthermore, it can be provided that each partial light-dark boundary has a color gamut of a preset color, and that different partial light-dark boundaries have color gamuts of different colors.

It can be useful that the partial light-dark boundary and the light-dark boundary run substantially straight, for example horizontally or vertically, or have an asymmetric elevation, wherein each color corresponds to a light wavelength in a preset light wavelength range, preferably to a preset light wavelength.

In a practical embodiment, it can be provided that the light source is designed to generate collimated light.

It can furthermore advantageously be provided that the light source can comprise an optical element for collimating light, such as a collimator or a front-end optic for collimating light or a TIR lens, and a preferably semiconductor-based light-emitting element, such as an LED light source, upstream of the optical element for collimating light.

It can furthermore be provided that the light source has at least two light-emitting regions, wherein each individual light-emitting region can be controlled, for example switched on and off, independently of the other light-emitting regions of the light source, and at least one, preferably exactly one, set of micro-optics is associated with each light-emitting region, such that the light generated by the respective light-emitting region impinges directly and exclusively on the set of micro-optics associated with the light-emitting region. Thus, it is possible to dynamically set, i.e. to set the color of the gamut of the light and dark boundary while the light module is running.

Drawings

The invention will be explained in more detail below with the aid of exemplary embodiments which are illustrated in the drawing, together with further advantages. In which are shown:

fig. 1 shows a perspective view of an illumination apparatus having a projection device composed of a plurality of micro-optical systems;

FIG. 1a shows an exploded view of one of the micro-optical systems of FIG. 1;

FIG. 1b shows a section A-A of the micro-optical system of FIG. 1 a;

FIGS. 2 and 3 illustrate micro-optics sets having micro-apertures and micro-exit optics spaced apart to different extents;

FIG. 4 shows a micro-optical system having a micro-aperture of finite thickness;

fig. 5 shows a micro-optical system set with differently curved light exit faces of micro-optical exit devices;

FIG. 6 shows different shapes of the micro-aperture and the micro-light distribution; and

fig. 7 shows a low beam distribution with an asymmetrical light-dark boundary.

Detailed Description

The drawings are schematic diagrams showing only those components that can be helpful in explaining the present invention. The person skilled in the art immediately realizes that the projection device and the light module for a motor vehicle headlight can have a plurality of further components, such as setting and adjusting devices, power supply mechanisms, etc., which are not shown here.

For easier reading and where appropriate for the drawings, reference axes are provided. The reference axis relates to a specific installation position in the motor vehicle and is a coordinate system of the motor vehicle.

Furthermore, it should be clear that direction-related terms such as "horizontal", "vertical", "above", "below", etc. are to be understood in a relative sense in connection with the invention and relate either to the above-mentioned professional installation orientation of the subject matter of the invention in a motor vehicle or to a professional, customary orientation of the emitted light in the light pattern or in the traffic space.

Accordingly, no such reference to axis or direction relative terms is to be construed as limiting.

Fig. 1 shows a lighting device 1 for a motor vehicle headlight, which can correspond to a light module according to the invention. The illumination device 1 comprises a projection means 2 formed by a plurality of micro optical systems 3 arranged in a matrix, wherein each micro optical system 3 has a micro entrance optics 30, a micro exit optics 31 associated with the micro entrance optics 30 and a micro aperture 32 arranged between the micro entrance optics 30 and the micro exit optics 31. Fig. 1 can identify: the matrix-like arrangement of the micro-optical systems 3 extends in two directions X (horizontal) and Y (vertical) substantially orthogonal to the main emission direction Z. As already mentioned, the coordinate systems shown in fig. 1, 1a and 1b relate to the technically customary installation position of the lighting device 1.

With the aid of the lighting device 1, a light distribution can be generated which is formed as a superposition of a plurality of micro-light distributions (for example in fig. 6), the light distributions being shaped by the individual micro-optical systems. Fig. 7 shows an exemplary light distribution of this type, which is designed as a low-beam distribution 8 with a light/dark boundary having an asymmetrical elevation 80. If the micro-optical systems are combined into a specific set of micro-optical systems (see below or above), each set of micro-optical systems is set up for shaping a partial light distribution. The partial light distribution is likewise a superposition of a plurality of micro light distributions. The light distribution or the overall light distribution is a superposition of partial light distributions.

Preferably, each micro-optical system 3 is constituted by exactly one micro-entrance optic 30, exactly one micro-exit optic 31 and exactly one micro-aperture 32 (fig. 1 a). All micro-entry optics 30 form here, for example, a one-piece entry optics 4. Similarly, all the micro exit optics 31 form, for example, a one-piece exit optics 5, while the micro aperture 32 forms, for example, a one-piece aperture arrangement 6. The entry optics 4, the exit optics 5 and the aperture arrangement 6 thus form, for example, a one-piece projection device 2. However, it is entirely conceivable that the projection device 2 is not of one-piece design. The micro entrance optics 30, the micro exit optics 31 and the micro apertures 32 can be applied, for example, on one or more preferably light-impermeable substrates 40, 50, 51, 52, 60, for example made of glass or plastic.

The aperture arrangement 6 is arranged in a plane substantially orthogonal to the main radial direction Z of the projection means 2, in an intermediate image plane 322. Thus, all the micro-apertures 32 are also located in the intermediate image plane 322. The entry optics 4, the exit optics 5 and the aperture arrangement 6 are arranged in planes substantially parallel to each other.

Fig. 1a schematically shows an enlarged exploded view of one of the micro-optical systems 3 of fig. 1. FIG. 1b shows section A-A of FIG. 1 a. For simplicity, the substrates 40, 50, 51, 52, 60 are omitted from this illustration. Fig. 1a can identify: the micro-apertures 32 can have optically effective edges 320. The micro-aperture 32 is spaced apart from the micro-exit optics 31 by a distance d. The optically effective edge 320 can be designed or formed as a light/dark boundary, so-called micro light/dark boundaries 3200, 3201 (see fig. 6), which can generate a micro light distribution. Reference should be made here to fig. 6. Fig. 6 shows different shapes of the optically effective edges 320a, 320b, 320c, 320d, 320e of the micro-aperture 32 and the micro-light distributions corresponding to these shapes, which can have, for example, a substantially horizontally running micro-light-dark boundary 3201 or an asymmetrically rising micro-light-dark boundary 3201.

The micro light distribution is formed by light passing through the respective micro optical systems 3. Therefore, preferably, each micro-optical system 3 shapes exactly one micro-light distribution, and vice versa: each micro light distribution is preferably shaped by exactly one micro optical system 3. The optically effective edges 320, 320a, 320b, 320c, 320d, 320e can have different extensions. If, as shown in fig. 1b, the iris diaphragm 32 is embodied as a recess 321, 321a, 321b, 321c, 321d, 321e in an otherwise light-tight sheet, the optically effective edge 320, 320a, 320b, 320c, 320d, 320e, which is embodied as a recess boundary, has a closed shape in this case (see also fig. 6). At least some of the optically effective edges 320, 320a, 320b, 320c, 320d, 320e are designed/configured to shape/form a micro-shaped bright-dark boundary 3200, 3201. In the micro-aperture shown in fig. 1a and 6, this portion is the lower portion of the optically effective edge 320, 320a, 320b, 320c, 320d, 320 e.

The skilled person immediately realizes that technical features relating to the geometry of the light distribution (also partial light distribution and micro light distribution) relate to a two-dimensional projection of the corresponding light distribution. If the light distribution is projected onto a measurement screen, which is set up at a distance of approximately 25 meters orthogonally to the main emission direction of light modules, luminaires or motor vehicle headlights, which are positioned in a technically customary installation orientation, this projection can be generated, for example, in a light technology laboratory. The above can be applied to the light and dark boundary (partial light and dark boundary or micro light and dark boundary) accordingly.

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

For example, in a micro-optical system 3 with micro-exit optics 31 with a top focal length of about 0.7mm for a light beam with a light wavelength of about 555nm (light from the green spectral range), the optically effective edges 320, 320a, 320b of the micro-aperture 32 are illuminated with white light, for example a semiconductor-based light source, preferably an LED light source320c, 320d, 320e are imaged in the form of a micro light-dark boundary with a violet color gamut, wherein the micro aperture is spaced apart from the micro exit optics 31 by the top focal length (the spacing d in this case being equal to the top focal length). The violet color of the gamut is due to the mixing of the blue and red contributions of white light. The spacing d is varied by shifting the micro-apertures 32 along the main radial direction Z. The color of the color gamut is thus also changed, since the micro-aperture is no longer located at the intersection of the green light beam (light beam having a light wavelength from the green spectral range) with the optical axis of the micro-exit optics, but for example at the intersection of the red or blue (light) beam with the optical axis of the micro-exit optics. Therefore, it is possible to determine the wavelength λ of light_dThe spacing d is selected. This example can lead to a general conclusion: if all the micro-optical systems of the projection apparatus are identical, the light-dark transition of the light distribution produced by means of the projection apparatus, for example the light-dark boundary of the low-beam distribution, has a color gamut of a color which is dependent on the distance d of the micro-aperture from the micro-exit optics. The colors of this gamut are produced by mixing light of wavelengths for which the micro-apertures do not lie in the focal plane (chromatic aberration).

In order to solve the color gamut problem and compensate for it, the entirety of the micro-optical system 3 is divided into at least two micro-optical system groups G1, G2, G3. Fig. 1 shows, for example, three micro-optical system groups G1, G2, G3. Associated with each of the groups G1, G2, G3 is a predetermined light wavelength range (for example, the green range), preferably a predetermined light wavelength λ_G1、λ_G2、λ_G3. This means that: each micro-optical system group includes a micro-optical system whose micro-aperture passes only light wavelengths λ having a wavelength in a preset light wavelength range_G1、λ_G2、λ_G3Preferably, the image is clearly imaged by light of a predetermined wavelength of light, for example, about 555 nm. According to the invention, the predetermined light wavelength ranges, preferably the predetermined light wavelengths λ, of the different groups of micro-optical systems G1, G2, G3_G1、λ_G2、λ_G3Is not provided withThe same is true. It can be advantageous if the different light wavelength ranges do not overlap. By the above-described sharp imaging of the micro-aperture 32 or its optically effective edges 320, 320a, 320b, 320c, 320d, 320e, of light of at least one light wavelength in the predetermined light wavelength range, preferably at the predetermined light wavelength λ_G1、λ_G2、λ_G3In the light image, micro light-dark transitions or boundaries are generated, which have a gamut of different colors. By superimposing the micro bright-dark transitions or boundaries, the color gamut is also superimposed in the light image, thereby achieving a color compensation effect, wherein the color of the entire light distribution or of the color gamut of the entire light distribution is adjusted. Preferably, the predetermined light wavelength range, in particular the predetermined light wavelength, is selected such that a white color gamut is produced.

The micro-apertures 32 of each micro-optical system group G1, G2, G3 can be combined to form a micro-aperture group, wherein the micro-aperture groups can be formed identically.

Furthermore, it can be provided that in each micro-optical system 3 at least a part of the micro-aperture 32 is spaced apart from the micro-exit optics 31 by a distance d, d1, d2, d3, wherein the distance d, d1, d2, d3 is equal to the light wavelength λ in the predetermined light wavelength range_d、λ_G1、λ_G2、λ_G3Correlated with, or correlated with, a light wavelength in one of the preset light wavelength ranges, and substantially identical within the same group of micro-optics G1, G2, G3. The distances d1, d2, d3 can be selected differently in the micro-optics 3, which are formed by different micro-optics groups G1, G2, G3. This means that: within the same micro-optics group G1, G2, G3, the micro-apertures 32 are spaced apart from the respective micro-exit optics by the same distance, wherein the distance d1, d2, d3 is dependent on the light wavelength, preferably the predetermined light wavelength λ, in the predetermined light wavelength range associated with the micro-optics group G1, G2, G3_G1、λ_G2、λ_G3To select. The micro-optical system 3, which is composed of two or more different micro-optical system groups G1, G2, G3, has a micro-diaphragm 32 and a corresponding micro-apertureThe micro exit optics 31 have two or more different spacings d1, d2, d3 between them. Each group of micro-optical systems G1, G2, G3 is designed such that the micro-aperture 32 can clearly image in light of at least one light wavelength, preferably in light of a predetermined light wavelength, in a predetermined light wavelength range.

In the above example involving the violet color gamut, the micro-apertures are imaged sharply with green light at a wavelength of about 555 nm.

The difference Δ d between the distances d1, d2, d3 in the different groups G1, G2, G3 of the micro-optics₁₂、Δd₂₃Can be about 0.01mm to about 0.12mm, preferably about 0.01mm to about 0.06mm, and especially about 0.01mm to about 0.03 mm. Here, the micro exit optics 31 preferably have a top focal length of about 0.7mm for green light, especially for light having a light wavelength of about 555 nm.

It should be noted here that the position of the micro-aperture in the micro-optical system group can be coordinated with a predetermined light wavelength range, preferably with a light wavelength, which is associated with the micro-optical system group. For example, if the micro-optical system group is to image a micro-aperture for green light (from the green range with a spectrum of light wavelengths of about 490nm to about 575 nm: λ -490-575 nm, in particular λ -555 nm), the position of the intermediate image plane is determined for this wavelength and subsequently the micro-aperture of the micro-optical system group is positioned into the green intermediate image plane or at the intersection of the green beam with the optical axis of the micro-exit optics. The micro-aperture and the micro-exit optics have a distance which is coordinated with the green light and thus dependent on the respective light wavelength.

In another set of micro-optics, the position of the micro-aperture is determined from the wavelength of light in another wavelength range of light of the spectrum. Other ranges of the spectrum are for example: a violet range (violet light) having a wavelength of light of about 380nm to about 420nm (lambda-380-420 nm); a blue color range (blue light) having a light wavelength of about 420nm to about 490nm (λ -420-490 nm); a yellow range (yellow light) having a light wavelength of about 575nm to about 585nm (λ -575-585 nm); an orange range (orange light) having a light wavelength of about 585nm to about 650nm (λ -585-; and a red color range (red light) having a light wavelength of about 650nm to about 750nm (lambda. 650-750 nm).

All optically effective edges 320, 320a, 320b, 320c, 320d, 320e in the same micro-optical system group can therefore be imaged sharply with light of a predetermined light wavelength range, preferably a predetermined light wavelength. That is, one or more light-dark transitions, e.g., one or more light-dark boundaries, created by the optically effective edges 320, 320a, 320b, 320c, 320d, 320e have a gamut of corresponding colors. Referring to the above example, a shift of about 0.06mm of the micro aperture spaced 0.7mm from the micro exit optics in a horizontal direction towards or away from the micro exit optics causes a red or blue color gamut at the micro light-dark transition or boundary. For example, by shifting the micro-aperture 0.03mm towards the micro-exit optics (or shifting the micro-exit optics to the micro-aperture, an orange color gamut may appear). The superposition of color gamuts in different colors in the light image causes a clear compensation of the color gamuts. For example, a yellow-red color gamut can be superimposed with a purple color gamut, thereby producing a substantially white color gamut, offset. This can be achieved, for example, by means of a projection apparatus comprising two micro-optical system groups consisting of an equal number of micro-optical systems, wherein the micro-exit optics of the micro-optical system groups are approximately 0.06mm thicker than the other micro-exit optics. The sharpness factor of the light distribution can then be adjusted.

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

As can be seen in fig. 1, the micro-exit optics 32 are applied on a substrate 50, 51, 52. The substrates 50, 51, 52 have different thicknesses according to the cases of the micro-optical system groups G1, G2, G3. The thickness of the substrates 50, 51, 52 in the respective micro-optics group G1, G2, G3 defines the spacing d1, d2, d3 between the micro-aperture 32 and the micro-exit optics 31 of this micro-optics group G1, G2, G3. It is also conceivable for the substrate 60 of the aperture arrangement 6 or the substrate 40 of the entry optics 4 to be designed with different thicknesses for different groups of micro-optics G1, G2, G3.

In fig. 2 and 3, it can be seen that the different distances d1, d2, d3 can also be achieved by means of an adhesive layer 53 having a thickness Δ d of, for example, 0.01mm to about 0.12mm, preferably about 0.01mm to about 0.06mm, in particular about 0.01mm to about 0.03 mm. The slightly thicker adhesive layer can be located, for example, between the micro-exit optics 31 and the substrate 50 of the exit optics 5 or between the micro-aperture 32 and the substrate 50 of the exit optics 5.

It is furthermore conceivable (see fig. 4) to produce the micro-aperture with a thickness D such that a rear, for example, part 32a of its optically effective edge, which is located distally (in the main emission direction Z) with respect to the micro-exit optics 31, is provided with a first light wavelength λ in a predetermined light wavelength range_G11While the portion 32b of the front of its optically effective edge, which is located proximally with respect to the micro-exit optics 31, is imaged sharply with the aid of a second light wavelength λ of a predetermined light wavelength range_G12The light of (2) is imaged clearly. That is, the distal portion 32a is disposed at the optical wavelength λ_G11And an optical axis OA of the micro-optical system 3_λG11And the proximal portion 32b is arranged at said light wavelength lambda_G12And an optical axis OA of the micro-optical system 3_λG12To (3).

Reference is made to the above example of a micro-optical system with micro-exit optics 31, wherein the micro-exit opticsThe device has a top focal length of about 0.7mm for a beam having a light wavelength of about 555nm (light from the green spectral range), and the micro-aperture 32 may be about 0.12mm thick, wherein the center of the micro-aperture can be spaced apart from the micro-exit optics 31 by about 0.7 mm. In this case, the distal portion 32a of the optically effective edge of the micro-aperture 32 is located at the intersection S of the red beam and the optical axis OA of the micro-exit optics 31_λG11And a portion 32b of the distal end of the optically effective edge of the micro-aperture 32 is located at the intersection S of the blue beam and the optical axis OA of the micro-exit optics_λG12To (3). Different portions of the optically effective edge, e.g. distal and proximal portions, are superimposed in the light image with a gamut of different colors in the form of a micro light-dark transition or boundary. The color gamut of the bright-dark boundary can likewise be compensated by this superposition.

However, with respect to simplicity of manufacture, it is preferred that the micro exit optics have different thicknesses, whether achieved by a thicker substrate, a thicker adhesive layer, or a thicker micro exit optics body. The production of different thicknesses of the micro-apertures is only possible by means of coating methods (photolithography) and results in air gaps in the projection apparatus. Micro-apertures of different thickness cannot be connected to flat glass plates, such as those used in imprint methods. However, it is possible to simply manufacture micro-exit optics of different thicknesses (corresponding to the offset of the refractive surface) with the aid of a tool.

Furthermore, it can be provided that the micro-exit optics 31 of each micro-optical system 3 have a light exit surface with a predetermined curvature k1, k2, wherein the predetermined curvature k1, k2 (predetermined curvature value) is associated with a light wavelength in a predetermined light wavelength range or with a light wavelength in one of the predetermined light wavelength ranges, preferably with one of the light wavelengths λ_G1、λ_G2、λ_G3Related to and substantially identical within the same micro-optical group G1, G2, G3, wherein the preset curvatures k1, k2 are different in micro-optical system 3 composed of different micro-optical groups G1, G2, G3In (1).

By changing the curvatures k1, k2 of the light exit face of the micro exit optics 31, the top focal length (for all colors) of the micro exit optics 31 can be changed. The micro-optical system 3 with the micro-exit optics 31 thus has different top focal lengths for predetermined light wavelengths λ, wherein the micro-exit optics 31 have light exit faces that are curved to different extents. Fig. 5 schematically shows two micro exit optics 31 from different groups G1, G2 of micro optical systems and a micro aperture 32 located upstream of the micro exit optics 31. It should be noted here that the micro apertures in this example are arranged at the same pitch from the micro exit optics 31. It goes without saying that this is not limiting. The distance between the micro-aperture and the micro-exit optics can also be varied here as described above and adapted to the wavelength of the light. The light exit face of the micro-exit optics 31 of fig. 5 is curved to a different extent. That is, the micro apertures 32 of the micro optical systems 3 of the first micro optical system group G1 can be located at the light wavelength λ_G1Is arranged to intersect the optical axis OA of the respective micro-optical system 3_λG1And the micro-aperture 32 of the micro-optical system 3 of the second micro-optical system group G2 can be located at the light wavelength λ_G2Is arranged to intersect the optical axis OA of the respective micro-optical system 3_λG2To (3). The optically effective edge of the micro-aperture 32 is thus imaged as a micro-bright-dark transition or boundary 3200, 3201 with a color gamut of different colors. As already mentioned, the light wavelength can be chosen such that the color gamut produced thereafter upon superimposition is white.

It goes without saying that the embodiments can be combined with one another. For example, it is possible to expediently vary the position of the micro-aperture (spacing dl, d2, d3 between the micro-aperture and the respective micro-exit optics) between groups of micro-optics, but also the curvature k1, k2 of the light exit surface of the micro-exit optics. In this case, for example, the overall thickness of the projection device can be influenced, but also the longitudinal extension of the entire light module in which the projection device is used, and thus, for example, the depth of the structure can be adjusted. It is for example entirely conceivable to provide the micro-optical system 3 of fig. 5 with an adhesive layer as in fig. 2 or 3 or a thicker substrate as in fig. 1.

As already mentioned, fig. 6 shows an example of a micro-aperture 32 with differently shaped indentations 321a, 321b, 321c, 321d, 321e and a micro-light distribution which can be produced by a corresponding shape of the indentations. Fig. 6 is able to identify two different shapes of miniature light and dark boundaries: a substantially horizontally extending miniature light and dark boundary 3201 and a miniature light and dark boundary with an asymmetric elevation 3201. As described above, the partial light distribution is formed by superimposing the micro light distributions of the same set of micro optical systems in the light image, said partial light distribution having a partial light-dark boundary with a color gamut of a preset color, wherein the preset color is associated with a preset light wavelength range, preferably with a preset light wavelength. The partial light distributions superimposed in the light image form a light distribution or an overall light distribution, for example a low-beam light distribution 8 in fig. 7. The micro light distribution with the micro light-dark boundary with the asymmetric elevation 3201 causes the partial light-dark boundary with the asymmetric elevation, wherein each partial light-dark boundary has a color gamut in a preset color. A bright-dark boundary with an asymmetric elevation 80 is thus formed, the color gamut of which has a color determined by the color of the color gamut of the partial light distribution. Preferably, the color of the color gamut with the light-dark boundary of the asymmetrical elevation 80 is white in the case of the low-beam distribution 8.

Although not shown in the drawings, different groups of micro-optical systems can be constructed completely separately from each other. It is conceivable here for different groups of micro-optics to be spaced apart from one another. The entry optics, the exit optics and the aperture arrangement can be arranged on separate, different, preferably light-permeable substrates.

Furthermore, fig. 1 shows that the lighting device 1 for a motor vehicle headlight has a light source 7 which is located 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 means 2 in the form of a light distribution, for example in the form of a low-beam distribution 8 with a light-dark boundary, for example in the form of a light-dark boundary with an asymmetrical elevation 80, into the region located in front of the luminaire.

As mentioned above, the light distribution is formed by a plurality of superimposed partial light distributions, each having a partial light-dark boundary. Each partial light distribution is formed by exactly one set of micro-optics.

Expediently, the light source 7 can be designed to generate collimated light.

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

Furthermore, it can be seen in fig. 1 that the light source 7 has three light-emitting regions 70, 71, 72. Each individual light emitting area can have one or more semiconductor based light sources, preferably LED light sources, and can be controlled, e.g. switched on and off, independently of the other light emitting areas of the light source 7. Furthermore, it can be useful to associate with each light-emitting region 70, 71, 72 at least one, preferably exactly one, micro-optical system group G1, G2, G3, so that the light generated by the respective light-emitting region 70, 71, 72 impinges directly and only on the micro-optical system group G1, G2, G3 associated with 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 disclosed herein. In the foregoing detailed description, for example, various features of the invention are summarized in one or more embodiments for the purpose of simplifying the disclosure. Disclosure of this approach should not be construed as reflecting the intent: the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing described embodiment.

Furthermore, although the description of the invention includes one or more embodiments and certain variations and modifications, other variations and modifications are within the scope of the invention, e.g., as may be within the ability and knowledge of those skilled in the art, after understanding the present disclosure.

The reference signs in the claims are only used for the sake of a better intelligibility of the invention and shall not be intended to limit the claimed invention in any manner.