Projection apparatus consisting of a plurality of micro-optical systems, and lighting module for a motor vehicle headlamp
Disclosed is a projection apparatus ( 2 ) for a lighting module ( 1 ) of a motor vehicle headlamp, the projection apparatus ( 2 ) being formed by a plurality of micro-optical systems ( 3 ) that are arranged like a matrix; each micro-optical system ( 3 ) includes a micro-input optical element ( 30 ), a micro-output optical element ( 31 ) associated with the micro-input optical element ( 30 ), and a micro-diaphragm ( 32 ), all micro-input optical elements ( 31 ) forming an input optical unit ( 4 ), all micro-output optical elements ( 31 ) forming an output optical unit ( 5 ), and the micro-diaphragms ( 32 ) forming a diaphragm device ( 6 ); the diaphragm device ( 6 ) is disposed in a plane extending substantially perpendicularly to the main direction of emission (Z) of the projection apparatus ( 2 ), while the input optical unit ( 4 ), the output optical unit ( 5 ) and the diaphragm device ( 6 ) are disposed in planes extending substantially parallel to one another; all of the micro-optical systems ( 3 ) are subdivided into at least two micro-optical system groups (G 1 , G 2 , G 3 ), and the micro-diaphragms ( 32 ) of the micro-optical systems ( 3 ) of each micro-optical system group (G 1 , G 2 , G 3 ) can be projected in focus by means of light having at least one optical wavelength (λG, λG 2 , λG 3 ) lying within a predefined optical wavelength range, the predefined optical wavelength ranges being different in different micro-optical system groups (G 1 , G 2 , G 3 ).
1. A lighting module ( 1 ) for a motor vehicle headlamp, the lighting module comprising:
a light source ( 7 ); and
a projection apparatus which comprises:
a plurality of micro-optical systems ( 3 ) arranged in a matrix-like manner, wherein each micro-optical system ( 3 ) has a micro-input optical element ( 30 ), a micro-output optical element ( 31 ) associated with the micro-input optical element ( 30 ), and a micro-diaphragm ( 32 ),
wherein all the micro-input optical elements ( 31 ) form an input optical unit ( 4 ), all the micro-output optical elements ( 31 ) form an output optical unit ( 5 ), and the micro-diaphragms ( 32 ) form a diaphragm device ( 6 ),
wherein the diaphragm device ( 6 ) is arranged in a plane substantially orthogonal to the main radiation direction (Z) of the projection apparatus ( 2 ), and the input optical unit ( 4 ), the output optical unit ( 5 ), and the diaphragm device ( 6 ), are arranged in planes substantially parallel to each other,
wherein the entirety of the micro-optical systems ( 3 ) is divided into at least two micro-optical system groups (G 1 , G 2 , G 3 ), and
wherein the micro-diaphragms ( 32 ) of the micro-optical systems ( 3 ) of each of the at least two micro-optical system group (G 1 , G 2 , G 3 ) can be sharply imaged by light of at least one light wavelength (λ G1 , λ G2 , λ G3 ) from a predefined light wavelength range, and the predefined light wavelength ranges are different for different ones of the at least two micro-optical system groups (G 1 , G 2 , G 3 );
wherein the projection apparatus ( 2 ) is arranged downstream of the light source ( 7 ) in the light radiation direction, and is configured to project light generated by the light source ( 7 ) into a region in front of the lighting module in the form of a light distribution ( 8 ) with a bright/dark boundary ( 80 ),
wherein the light distribution is formed by a plurality of overlapping partial light distributions, each with a partial bright/dark boundary, and each partial light distribution is formed by exactly one micro-optical system group,
wherein each partial bright/dark boundary has a color fringe of a predefined color, and different partial bright/dark boundaries have color fringes of different colors, and each color corresponds to a light wavelength (λ G1 , λ G2 , λ G3 ) from a predefined light wavelength range, and
wherein the color fringes are overlayed to form a white color fringe.
2. The lighting module according to claim 1 , wherein:
in each micro-optical system ( 3 ) at least a part of the micro-diaphragm ( 32 ) is spaced apart from the micro-output optical element ( 31 ) by a distance (d, d 1 , d 2 , d 3 ),
the distance (d, d 1 , d 2 , d 3 ) depends on the at least one light wavelength (λ d , λ G1 , λ G2 , λ G3 ) from a predefined light wavelength range, and is the same within the same micro-optical system group (G 1 , G 2 , G 3 ), and
the distances (d 1 , d 2 , d 3 ) are different for the micro-optical systems ( 3 ) from different micro-optical system groups (G 1 , G 2 , G 3 ).
3. The lighting module according to claim 2 , wherein:
differences (Δ d12 , Δ d23 ) between the distances (d 1 , d 2 , d 3 ) in different micro-optical system groups (G 1 , G 2 , G 3 ) amount to about 0.01 mm to about 0.12 mm, and
the micro-output optical elements ( 31 ) have a focal length which depends on the at least one light wavelength (λ d , λ G1 , λ G2 , λ G3 ) from a predefined light wavelength range, and on the diameter of the respective micro-output optical element ( 31 ).
4. The lighting module according to claim 1 , wherein:
the micro-output optical element ( 31 ) of each micro-optical system ( 3 ) has a light-output surface with a predefined curvature (k 1 , k 2 ),
the predefined curvature (k 1 , k 2 ) depends on the at least one light wavelength (λ G1 , λ G2 , λ G3 ) from a predefined light wavelength range and is the same within the same micro-optical system group (G 1 , G 2 , G 3 ), and
the predefined curvatures (k 1 , k 2 ) are different for the micro-optical systems ( 3 ) from different micro-optical system groups (G 1 , G 2 , G 3 ).
5. The lighting module according to claim 1 , wherein at least some of the micro-diaphragms ( 32 ) of each micro-optical system group (G 1 , G 2 , G 3 ) have edges ( 320 , 320 a , 320 b , 320 c , 320 d , 320 e ), which are designed to image a substantially horizontal micro-bright/dark boundary.
6. The lighting module according to claim 5 , wherein the micro-bright/dark boundaries can be sharply imaged for different micro-optical system groups by light of the different light wavelengths (λ G1 , λ G2 , λ G3 ).
7. The lighting module according to claim 1 , wherein the different micro-optical system groups (G 1 , G 2 , G 3 ) are designed separately from each other, and are spaced apart.
8. The lighting module according to claim 1 , wherein:
the micro-diaphragms ( 32 ) of each micro-optical system group (G 1 , G 2 , G 3 ) are combined to form a micro-diaphragm group, and the micro-diaphragm groups are of identical design,
each micro-diaphragm ( 32 ) is designed as a platelet of an opaque material with an aperture ( 321 , 321 a , 321 b , 321 c , 321 d , 321 e ), and
each micro-diaphragm ( 32 ) has a finite thickness (D) along the main radiation direction (Z).
9. The lighting module according to claim 1 , wherein the partial bright/dark boundaries and the bright/dark boundary run substantially straight or have an asymmetric slope ( 80 ).
10. The lighting module according to claim 1 , wherein the light source ( 7 ) is configured to generate collimated light.
11. The lighting module according to claim 1 , wherein the light source ( 7 ) comprises a light-collimating optical element ( 9 ) and a semiconductor-based lighting element ( 10 ).
12. The lighting module according to claim 1 , wherein 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 (G 1 , G 2 , G 3 ) is assigned to each light-emitting region ( 70 , 71 , 72 ) in such a way that light generated by the respective light-emitting region ( 70 , 71 , 72 ) impinges directly and only onto the micro-optical system group (G 1 , G 2 , G 3 ) assigned to this light-emitting region ( 70 , 71 , 72 ).
13. A motor vehicle headlamp comprising at least one lighting module according to claim 1 .
14. The lighting module according to claim 3 , wherein the differences (Δ d12 , Δ d23 ) between the distances (d 1 , d 2 , d 3 ) in different micro-optical system groups (G 1 , G 2 , G 3 ) range from about 0.01 mm to about 0.06 mm.
15. The lighting module according to claim 14 , wherein the differences (Δ d12 , Δ d23 ) between the distances (d 1 , d 2 , d 3 ) in different micro-optical system groups (G 1 , G 2 , G 3 ) range from about 0.01 mm to about 0.03 mm.
16. The lighting module according to claim 8 , wherein the finite thickness (D) along the main radiation direction (Z) is about 0.01 mm to about 0.12 mm.
17. The lighting module according to claim 16 , wherein the finite thickness (D) along the main radiation direction (Z) is about 0.06 mm.
18. The lighting module according to claim 11 , wherein:
the semiconductor-based lighting element ( 10 ) is an LED light source, and/or
the light-collimating optical element ( 9 ) is a collimator, a light-collimating optical attachment, or a TIR lens.