| CPC F21S 41/25 (2018.01) [F21S 41/147 (2018.01); F21S 41/151 (2018.01); F21S 41/24 (2018.01); F21S 41/285 (2018.01); F21S 41/322 (2018.01); F21W 2102/135 (2018.01); F21Y 2115/10 (2016.08)] | 14 Claims |
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1. An illumination device (10) for a motor vehicle headlamp for generating a low beam, wherein a vertical extension of the low beam extends along a V-V line from at least 0° down to at least −10° on the V-V line, said illumination device (10) comprising:
at least one light source (50) configured to emit light-rays in different light-ray paths;
an optic body (100) which comprises:
a common light input section (110) for coupling light-rays from the at least one light source (50) into the optic body (100), said light input section (110) having at least one light collecting element (120), which is assigned to a respective light source (50) and is configured to couple light rays from the assigned light source (50) into the optic body (100),
a light output section (130) for decoupling light-rays that are coupled into the optic body (100) via the common light input section (110), out of the optic body (100) in a main direction (X) of the illumination device (10), and
a shell surface (140) limiting the optic body (100), said shell surface (140) is configured to deflect light rays coupled into the optic body (100), which shell surface (140) extends between the common light input section (110) and the light output section (130); and
a projection lens system (200), comprising at least one lens, arranged downstream of the optic body (100) along the main direction (X) in order to receive light-rays emitted from light output section (130) of the optic body (100), wherein the projection lens system (200) is configured to project the light-rays in front of the illumination device (10),
wherein the projection lens system (200) in combination with the at least one light source (50) and the optic body (100) are configured to generate the low beam illuminated by the projection lens system (200),
wherein the optic body (100) comprises a first set of optically operative surfaces for guiding at least a part of the light-rays coupled into the optic body (100) via the common light input section (110) along a first light-ray path (LR1) from the common light input section (110) to the light output section (130),
wherein the first set of operative surfaces comprises a first and second light deflection surface (300a, 300b), and a first light exit surface (300c), wherein the first and second light deflection surfaces (300a, 300b) are arranged on the shell surface (140), and wherein the first light exit surface (300c) is arranged on the light output section (130),
wherein light rays following the first light-ray path (LR1) are incident on the first deflection surface (300a) and are deflected to the second deflection surface (300b), and wherein light-rays incident on the second deflection surface (300b) are deflected to the first light exit surface (300c) for coupling out of the optic body (100),
wherein light-rays emitted by the first light exit surface (300c) contribute to generate a first part of the low beam,
wherein the optic body (100) comprises a second set of optically operative surfaces for guiding at least a part of light-rays coupled into the optic body (100) via the common light input section (110) along a second and a third light-ray path (LR2, LR3) from the common light input section (110) to the light output section (130),
wherein the second set of optically operative surfaces comprises a third deflection surface (400a) and a second light exit surface (400b), wherein the third deflection surface (400a) is arranged on the shell surface (140) and the second light exit surface (400b) is arranged on the light output section (130) separate from the first light exit surface (300c),
wherein light-rays following the second light-ray path (LR2) are incident on the third deflection surface (400a) and are deflected to the second light exit surface (400b) for coupling out of the optic body (100), and wherein light rays following the third light-ray path (LR3) are incident on the second light exit surface (400b) directly from the common light input section (110),
wherein light-rays emitted by the second light exit surface (400b) contribute to generate a second part of the low beam,
wherein the first part of the low beam contributed by the first light exit surface (300c) and the second part of the low beam contributed by the second light exit surface (400b) form a low beam, wherein the vertical extension of the low beam extends along the V-V line from at least 0° down to lower −10° on the V-V line, and
wherein the first light exit surface (300c) and the shell surface (140) intersect in a common surface section line (150), which builds an asymmetric cut-off boundary for the low beam.
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